CN112282747A

CN112282747A - Knee fold structure determination method and device

Info

Publication number: CN112282747A
Application number: CN202011216296.2A
Authority: CN
Inventors: 梁瀚; 杨雨; 冉崎; 文龙; 陈康; 罗冰; 狄贵东; 韩嵩
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2021-01-29
Anticipated expiration: 2040-11-04
Also published as: CN112282747B

Abstract

The application discloses a knee fold structure determining method and device, and relates to the technical field of oil and gas exploitation. The upper computer may generate a second seismic profile image including a partial profile image between the first line and the second line based on the dip log data for the producing well and the first seismic profile image. Because the partial cross-sectional image is obtained based on the dip log data of the producing well, the partial cross-sectional image can accurately represent the condition of the stratum penetrated by the producing well. Thereby, it can be ensured that the host computer can accurately determine whether the configuration type of the wing through which the production well passes is a knee fold configuration based on the second seismic profile image including the partial profile image. Compared with the method that in the related art, the worker determines the knee fold structure according to the fuzzy image of the wing part, the method provided by the application effectively improves the accuracy of determining the knee fold structure.

Description

Knee fold structure determination method and device

Technical Field

The application relates to the technical field of oil and gas exploitation, in particular to a knee-fold structure determining method and device.

Background

Anticline formation refers to a formation that bulges upward in shape when the formation is bent. The types of configurations of the wing portions of the anticline configuration include knee fold configurations, fault configurations, and the like. Since fault formations typically block a complete hydrocarbon reservoir, during drilling, if a wing of a anticline formation is drilled, a worker typically needs to first determine whether the formation type of the wing is a knee-fold formation. If the configuration type is a knee-fold configuration, drilling may continue to produce hydrocarbons.

In the related art, a worker may use a seismic profile image of a anticline structure to determine whether the type of structure of the wing is a knee-fold structure. However, the image of the seismic profile image at the location of the wing is generally blurry, resulting in less accuracy in determining the knee fold configuration.

Disclosure of Invention

The application provides a knee fold structure determining method and device, which can solve the problem of low accuracy of the determined knee fold structure in the related art. The technical scheme is as follows:

in one aspect, a method for determining a knee fold configuration is provided, the method comprising:

obtaining a first seismic profile image of a production well, the first seismic profile image comprising: the image of the borehole trajectory of the production well, the sectional images of the plurality of strata at the position of the production well, and a first straight line and a second straight line in the sectional images, wherein the first straight line respectively passes through first stratum corners of the plurality of strata, the second straight line respectively passes through second stratum corners of the plurality of strata, the first stratum corners and the second stratum corners of the same stratum are adjacent, the orientations of the first stratum corners of the plurality of strata are the same, and the orientations of the second stratum corners of the plurality of strata are the same;

generating a second seismic profile image based on the stratigraphic dip log data of the production well and the first seismic profile image, the second seismic profile image comprising: a partial section image located between the first line and the second line in the section images of the plurality of earth layers;

and if a first intersection point of the target stratum in the partial section image and the first straight line and a second intersection point of the target stratum in the partial section image and the second straight line are located in the target stratum in the section image in the plurality of strata penetrated by the production well, determining that the geological structure type of the target stratum in the partial section image is a knee-fold structure.

Optionally, the generating a second seismic profile image based on the stratigraphic dip well logging data of the production well and the first seismic profile image includes:

obtaining a model image of the production well, the model image being generated based on an image of a wellbore trajectory of the production well and the formation dip logging data;

generating a second seismic profile image based on the model image and the first seismic profile image.

Optionally, the obtaining a model image of the production well includes:

and adding a partial section image of each stratum in the plurality of stratums penetrated by the production well on the image of the borehole track based on the stratum dip angle logging data to obtain a model image of the production well.

Optionally, the method further includes:

determining a first position of the first intersection point in the second seismic profile image and a second position of the second intersection point in the second seismic profile image;

determining a third intersection point of the target stratum in the sectional image and the first straight line, a third position in the second seismic sectional image, and a fourth intersection point of the target stratum in the sectional image and the second straight line, a fourth position in the second seismic sectional image;

and if the first position is the same as the third position and the second position is the same as the fourth position, determining that the first intersection point and the second intersection point are both located in the target stratum in the section image.

Optionally, the acquiring a first seismic profile image of the production well comprises:

generating an initial seismic profile image based on the seismic data, the initial seismic profile image comprising: a profile image of the plurality of formations;

adding an image of the wellbore trajectory of the producing well on the initial seismic profile image based on the wellbore trajectory data of the producing well;

adding the first straight line on the initial seismic section image;

and adding the second straight line on the initial seismic section image to obtain a first seismic section image of the production well.

Optionally, the acquiring a first seismic profile image of a production well comprises:

if the formation traversed by the production well is continuous, a first seismic profile image of the production well is acquired.

Optionally, the method further includes:

obtaining a log of the production well, the log comprising: at least one of a natural gamma log, a sonic log, and a resistivity log;

determining that the plurality of strata traversed by the production well are continuous if it is determined based on the log that formation times of the plurality of strata traversed by the production well one by one increase in sequence;

determining that the plurality of formations traversed by the production well are not consecutive if it is determined based on the log that the formation times for the plurality of formations traversed by the production well one by one have not sequentially increased.

Optionally, the first straight line and the second straight line are both angle bisectors.

In another aspect, there is provided a knee fold configuration determination apparatus, the apparatus comprising:

a first acquisition module to acquire a first seismic profile image of a production well, the first seismic profile image comprising: the image of the borehole trajectory of the production well, the sectional images of the plurality of strata at the position of the production well, and a first straight line and a second straight line in the sectional images, wherein the first straight line respectively passes through first stratum corners of the plurality of strata, the second straight line respectively passes through second stratum corners of the plurality of strata, the first stratum corners and the second stratum corners of the same stratum are adjacent, the orientations of the first stratum corners of the plurality of strata are the same, and the orientations of the second stratum corners of the plurality of strata are the same;

a generating module, configured to generate a second seismic profile image based on the stratigraphic dip logging data of the production well and the first seismic profile image, where the second seismic profile image includes: a partial section image located between the first line and the second line in the section images of the plurality of earth layers;

the first determining module is used for determining that the geological structure type of the target stratum in the partial section image is a knee-fold structure if a first intersection point of the target stratum in the partial section image and the first straight line and a second intersection point of the target stratum in the partial section image and the second straight line are both located in the target stratum in the section image in a plurality of strata penetrated by the production well.

In another aspect, there is provided a device for adjusting pipe transmission parameters of a gas pipeline, the device comprising: a processor, a memory and a computer program stored on the memory and executable on the processor, the processor when executing the computer program implementing the method of determining a knee-fold configuration as described in the above aspect.

In yet another aspect, a computer-readable storage medium having instructions stored therein, which when run on a computer, cause the computer to perform the knee fold configuration determining method according to the above aspect is provided.

In a further aspect, there is provided a computer program product containing instructions which, when run on the computer, cause the computer to perform the method of determining a knee fold configuration of the above aspect.

The beneficial effect that technical scheme that this application provided brought includes at least:

the upper computer can generate a second seismic section image comprising a partial section image positioned between a first straight line and a second straight line based on stratigraphic dip logging data of a production well and the first seismic section image. Because the partial cross-sectional image is obtained based on the dip log data of the producing well, the partial cross-sectional image can accurately represent the condition of the stratum penetrated by the producing well. Thereby, it can be ensured that the host computer can accurately determine whether the configuration type of the wing through which the production well passes is a knee fold configuration based on the second seismic profile image including the partial profile image. Compared with the method that in the related art, the worker determines the knee fold structure according to the fuzzy image of the wing part, the method provided by the application effectively improves the accuracy of determining the knee fold structure.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a flowchart of a knee fold configuration determining method according to an embodiment of the present disclosure;

fig. 2 is a flowchart of another knee fold configuration determination method provided in an embodiment of the present application;

FIG. 3 is a flow chart of a method of acquiring a first seismic profile image of a production well according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a host computer generating a first seismic profile image according to an embodiment of the present disclosure;

FIG. 5 is a flowchart of a method for generating a second seismic profile image based on dip log data from a producing well and a first seismic profile image according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a model image of a production well provided by an embodiment of the present application;

FIG. 7 is a schematic illustration of a second seismic profile provided by an embodiment of the present application;

fig. 8 is a block diagram illustrating a knee fold configuration determining apparatus according to an embodiment of the present disclosure;

fig. 9 is a block diagram of another knee fold configuration determination apparatus provided in an embodiment of the present application;

fig. 10 is a block diagram of a determination apparatus of another knee fold configuration according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The embodiment of the application provides a method for determining a knee fold structure, and the method can be applied to an upper computer. Referring to fig. 1, the method may include:

step 101, a first seismic profile image of a production well is acquired.

The first seismic profile image may include: an image of a wellbore trajectory of a production well, a cross-sectional image of a plurality of formations at a location of the production well, and a first line and a second line in the cross-sectional image.

The image of the well track of the production well is positioned between a first straight line and a second straight line, and the stratum between the first straight line and the second straight line is the wing part of the anticline structure. I.e. the production well may pass through the wings of the anticline formation. The first line may pass through a first formation corner of the plurality of formations, respectively, and the second line may pass through a second formation corner of the plurality of formations, respectively.

For example, the first formation corner may be a syncline wing transition corner of the formation, and may also be referred to as a bisection corner of the syncline zone formation and the wing formation. The second formation corner may be a corner transformed from a anticline wing of the formation, and may also be referred to as a bisection corner of the formation in the anticline region and the wing. Accordingly, the first line may be an axis that transitions to the angled wing (also referred to as a syncline axis) and the second line may be an axis that transitions to the anticline wing of the formation (also referred to as a anticline axis). And, the first straight line may be parallel to the second straight line.

The first formation turn of the same formation is adjacent to the second formation turn, and the orientations of the first formation turns of the plurality of formations are the same, and the orientations of the second formation turns of the plurality of formations are the same. The orientation of the same first formation turn and second formation turn may be different. That is, formations in the syncline zone formations have the same dip and formations in the anticline zone formations have the same dip. The formation dip of the syncline formation is different from the formation dip of the anticline formation.

And 102, generating a second seismic section image based on the stratigraphic dip logging data of the production well and the first seismic section image.

After the upper computer obtains the first seismic section image of the production well, a second seismic section image can be generated based on the stratigraphic dip logging data of the production well and the first seismic section image. Wherein the second seismic profile image may comprise: the cross-sectional images of the plurality of earth formations include a portion of the cross-sectional image between the first line and the second line.

And 103, if a first intersection point of the target stratum in the partial section image and the first straight line and a second intersection point of the target stratum in the partial section image and the second straight line are located in the target stratum in the section image in the plurality of strata penetrated by the production well, determining that the geological structure type of the target stratum in the partial section image is a knee-fold structure.

After the second seismic section image is generated, the upper computer may detect whether the target formation in the partial section image, that is, the partial section image of the target formation in the partial section image, and the first intersection point of the first straight line and the second intersection point of the target formation in the partial section image and the second straight line are both located in the target formation in the section image, that is, whether both are located in the section image of the target formation in the section image, among the plurality of formations through which the production well passes. If the upper computer determines that the first intersection point and the second intersection point are both located in the target stratum in the section image, the geological structure type of the target stratum in the part of the section image can be determined to be a knee-fold structure.

The upper computer can confirm to continue oil and gas exploitation after confirming that this geological structure type is knee-fold structure, can control oil and gas exploitation equipment to carry out oil and gas exploitation then.

In summary, the present application provides a knee fold structure determination method, and the upper computer may generate a second seismic section image including a partial section image located between a first straight line and a second straight line based on the dip log data of the production well and the first seismic section image. Because the partial cross-sectional image is obtained based on the dip log data of the producing well, the partial cross-sectional image can accurately represent the condition of the stratum penetrated by the producing well. Thereby, it can be ensured that the host computer can accurately determine whether the configuration type of the wing through which the production well passes is a knee fold configuration based on the second seismic profile image including the partial profile image. Compared with the method that in the related art, the worker determines the knee fold structure according to the fuzzy image of the wing part, the method provided by the embodiment of the application effectively improves the accuracy of determining the knee fold structure.

Fig. 2 is another knee-fold configuration determination method provided in an embodiment of the present application, which may be applied to an upper computer. Referring to fig. 2, the method may include:

step 201, a logging curve of a production well is obtained.

The upper computer can acquire the logging curve of producing the well, and this logging curve can include: at least one of a natural gamma log, a sonic log, and a resistivity log.

For example, the log may include: natural gamma log curves, sonic log curves, and resistivity log curves. Because the logging curves comprise a natural gamma logging curve, a sound wave logging curve and a resistivity logging curve, the accuracy that whether a plurality of stratums which a production well passes through one by one are continuous or not is ensured based on the logging curves by a follow-up upper computer, and the accuracy that the follow-up upper computer determines the structure type of a target stratum is ensured.

Alternatively, the well log of the production well may be pre-stored in the upper computer, for example, the well log may be stored in a database of the upper computer.

Step 202, detecting whether the formation time of a plurality of strata which are penetrated by the production well one by one is increased in sequence or not based on the logging curve.

After the upper computer acquires the logging curve, whether the formation time of a plurality of strata which are penetrated by the production well one by one is increased in sequence or not can be determined based on the logging curve. If the host computer determines that the formation times for the multiple formations traversed by the production well one by one have not increased in turn, step 203 may be performed. If the host computer determines that the formation times of multiple formations traversed by the production well one by one have increased in sequence, step 204 may be performed.

After the upper computer obtains the logging curve, the types of the plurality of stratums through which the production wells pass one by one can be determined based on the logging curve. In geology, it is common for a first-formed formation to be located below (i.e., near the centroid), a second-formed formation to be located above (i.e., away from the centroid), and for the type of first-formed formation to be different from the type of second-formed formation. Based on this, the host computer may detect whether the same type of formation is present in the plurality of formations traversed by the production well, i.e., whether a duplicate formation is present in the plurality of formations. If the host computer determines that the same type of formation is present in the plurality of formations, it may be determined that the formation times for the plurality of formations traversed by the production well one by one have not increased in sequence. If the upper computer determines that the same type of stratum does not exist in the plurality of strata, it can be determined that the formation time of the plurality of strata through which the production well passes one by one is sequentially increased.

Or after the upper computer determines the types of the multiple strata penetrated by the production wells one by one, for each stratum in the multiple strata penetrated by the production wells, the upper computer may determine the formation time of the stratum based on the type of the stratum and the corresponding relationship between the formation time of the stratum and the type of the stratum, so as to obtain the formation times of the multiple strata. The host computer may then determine whether the formation times of the plurality of earth formations increase in sequence based on the formation times of the plurality of earth formations. The corresponding relation between the formation time of the stratum and the type of the stratum can be pre-stored in the upper computer.

For example, assume that the plurality of formations traversed by the production well one after the other are, in order: formation a, formation B, formation a, and formation C. Since there is a duplicate formation a of the four formations traversed by the production well, the host computer may determine that the formation times of the multiple formations traversed by the production well have not increased in sequence and may then perform step 203.

Assuming that the multiple strata traversed by the production well one by one are in turn: formation a, formation B, formation C, and formation D. Since there are no duplicate formations in the four formations traversed by the production well, the host computer may determine that the formation times of the multiple formations traversed by the production well have increased in sequence, and may then perform step 204.

Step 203 determines a plurality of formation discontinuities traversed by the production well.

If the upper computer determines that the formation time of the plurality of strata penetrated one by the production well does not increase in sequence based on the log, the plurality of strata penetrated by the production well can be determined to be discontinuous, and then the geological structure type of the plurality of strata penetrated by the production well can be determined to be fault structure. For example, the host computer may determine that the geological formation type of the last formation of the plurality of formations traversed by the production well is a fault formation.

Step 204, determining a plurality of formation continuations traversed by the production well.

If the upper computer determines that the formation time of the plurality of strata penetrated by the production well one by one is sequentially increased based on the logging curve, the plurality of strata penetrated by the production well can be determined to be continuous, and then the subsequent process can be executed.

Step 205, a first seismic profile image of a production well is acquired.

If it is determined that the formation traversed by the production well is continuous, the upper computer may acquire a first seismic profile image of the production well. The first seismic profile image may include: an image of a wellbore trajectory of a production well, a profile image of a plurality of formations at a location of the production well, and a first line and a second line in the profile image.

Wherein the image of the wellbore trajectory of the production well may lie between the first line and the second line, the formation between the first line and the second line being a wing of the anticline formation. I.e. the production well may pass through the wings of the anticline configuration. The first line may pass through a first formation corner of the plurality of formations, respectively, and the second line may pass through a second formation corner of the plurality of formations, respectively. The plurality of formations may each be formations having formation corners.

The first formation corner and the second formation corner of the same formation may be adjacent and the first formation corners of the plurality of formations may be oriented in the same direction and the second formation corners of the plurality of formations may be oriented in the same direction. A first formation corner of the same formation may be oriented differently than a second formation corner. That is, formations in the syncline zone formations have the same dip and formations in the anticline zone formations have the same dip. The formation dip of the syncline formation is different from the formation dip of the anticline formation.

In this embodiment, the first straight lines respectively passing through the first formation corners of the plurality of formations may be straight lines forming a minimum included angle with an angle bisector of the first formation corner of the plurality of formations, that is, the sum of the included angles of the first straight lines and the angle bisector of the first formation corner of the plurality of formations is minimum. Alternatively, the first line may be an angular bisector of a first formation corner of at least two of the plurality of formations. The second straight lines respectively passing through the second stratum corners of the plurality of strata may be straight lines forming a minimum included angle with the angle bisector of the second stratum corner of the plurality of strata, that is, the sum of the included angles of the second straight lines and the angle bisector of the second stratum corner of the plurality of strata is minimum. Alternatively, the second line may be an angular bisector of a second formation corner of at least two of the plurality of formations.

For example, if the first formation corner of any one of the plurality of formations is parallel to the first formation corner of each of the other of the plurality of formations, the first line is the angular bisector of the first formation corner of each of the plurality of formations. That is, the first straight line is a connection line of transition points of syncline wing transformation of the plurality of strata, and the syncline wing transformation process may include: formation dip shifts and formation dip shifts.

And if the second stratum corner of any one stratum in the plurality of strata is parallel to the second stratum corner of each other stratum in the plurality of strata, the second straight line is the angular bisector of the second stratum corner of each stratum in the plurality of strata. That is, the first straight line is a connection line of transition points of the syncline wing portions of the plurality of strata.

FIG. 3 is a flow chart of a method of acquiring a first seismic profile image of a production well according to an embodiment of the present application. Referring to FIG. 3, the process of the upper computer acquiring a first seismic profile image of a production well may include:

step 2051 generates an initial seismic profile image based on the seismic data.

After determining that a plurality of stratums penetrated by the production well are continuous, the upper computer can acquire seismic data and generate an initial seismic section image based on the seismic data. Wherein the initial seismic profile image may include: a profile image of a plurality of formations at the location of the production well.

Alternatively, the initial seismic section image may be a depth-domain section image, and the first ratio of the unit distance in the first direction in the initial seismic section image to the actual distance represented by the unit distance and the second ratio of the unit distance in the second direction in the initial seismic section image to the actual distance represented by the unit distance may be equal. Thereby, the accuracy of the subsequent generation of the first seismic profile image based on the initial seismic profile image can be ensured. Wherein the first direction may be perpendicular to the second direction.

For example, assuming that the first ratio is 1:100, the second ratio should be 1: 100. Wherein, 1:100 may refer to: 1 centimeter (cm) on the initial seismic section, representing an actual distance of 1 meter (m).

Step 2052, adding an image of the wellbore trajectory of the producing well to the initial seismic profile image based on the wellbore trajectory data of the producing well.

The upper computer can also acquire the borehole trajectory data of the production well after determining that a plurality of strata penetrated by the production well are continuous. And, the host computer, after generating the initial seismic profile image, may add an image of the wellbore trajectory of the producing well on the initial seismic profile image based on the wellbore trajectory data of the producing well.

In an embodiment of the present application, wellbore trajectory data for a production well may include: during drilling, measured trajectory parameters of the plurality of measurements may include: well depth (which may also be referred to as well depth), angle of inclination, and azimuth angle of inclination. The upper computer may then add an image of the wellbore trajectory of the production well on the initial seismic profile image based on the trajectory parameters of the plurality of measurements.

By way of example, FIG. 4 shows a schematic of an initial seismic profile image. Referring to fig. 4, the upper computer on the initial seismic profile image 01 may add an image 02 of the wellbore trajectory of the production well based on the wellbore trajectory data of the production well.

Step 2053, add a first straight line to the initial seismic section image.

In an embodiment of the application, the upper computer may add a first straight line near the image of the borehole trajectory of the production well in the initial seismic profile image added with the image of the borehole trajectory of the production well.

Alternatively, the worker may draw a first straight line in the initial seismic profile image with the addition of an image of the wellbore trajectory for the production well. Accordingly, the host computer may receive a first line drawing instruction to add a first line to the initial seismic profile image.

Alternatively, after the upper computer adds the image of the borehole trajectory of the production well to the initial seismic profile image, a first formation turn may be determined for each of the plurality of formations on one side of the image of the borehole trajectory based on the image of the borehole trajectory of the production well. The upper computer may then determine a bisector of the first formation corner for each formation and then add a first straight line on the initial seismic profile image based on the bisector of the plurality of first formation corners. The sum of the angles of the first line and the bisector of the plurality of first formation corners may be minimized. For example, the first line may be at an angle of 0 to a first formation corner of each of the plurality of formations. That is, the first line may be an angular bisector of a first formation corner of each of the plurality of formations.

Step 2054, a second straight line is added to the initial seismic profile image to obtain a first seismic profile image of the production well.

The upper computer can add a second straight line on the initial seismic section image added with the first straight line, so that a first seismic section image of the production well is obtained.

Alternatively, the staff may draw a second straight line on the initial seismic section image to which the first straight line is added. Accordingly, the upper computer may receive a second line drawing instruction to add a second line to the initial seismic profile image.

Or after the upper computer determines the first stratum corner of each stratum, the upper computer may determine a second stratum corner adjacent to the first stratum corner in each stratum. The host computer may then determine a bisector of the second formation angle for each formation and then add a second straight line on the initial seismic profile image based on the bisector of the plurality of second formation angles. The sum of the angles between the second line and the bisector of the plurality of second formation corners may be minimized. For example, the second line may be at an angle of 0 to the second formation corner of each of the plurality of formations. That is, the second line may be an angular bisector of the second formation corner of each of the plurality of formations.

For example, continuing with reference to FIG. 4, the upper computer may identify a first formation turn for each of a plurality of formations on one side of the image 02 of the wellbore trajectory on an initial seismic section image with an image of the wellbore trajectory for a production well added thereto, and may then add a first line 03 on the initial seismic section image 01.

The host computer may then determine a second formation angle for each of the plurality of formations and add a second straight line 04 to the initial seismic profile image 01. Furthermore, it can be seen from fig. 4 that the image 02 of the borehole trajectory of the production well is located between the first line 03 and the second line 04. The image of the formation between the first line 03 and the second line 04 is blurred.

And step 206, generating a second seismic section image based on the stratigraphic dip logging data of the production well and the first seismic section image.

And after the upper computer obtains the first seismic section image, generating a second seismic section image based on the stratigraphic dip logging data of the production well. Wherein the second seismic profile image may comprise: the cross-sectional images of the plurality of earth formations include a portion of the cross-sectional image between the first line and the second line. The formation dip logging data may be acquired during drilling and may be pre-stored in the upper computer, for example, the formation dip logging data may be stored in a database of the upper computer. The formation dip logging data may include: data for each of a plurality of formations traversed by the production well may include formation depth (which may also be referred to as well depth), formation dip, and formation dip.

In an alternative implementation, the upper computer may add a plurality of partial section images of the formation to the image of the borehole trajectory between the first straight line and the second straight line in the first seismic section image based directly on the dip log data of the producing well, to obtain the second seismic section image.

In this embodiment, for the data of each of the plurality of strata penetrated by the production well in the formation dip log data, the upper computer may determine, in the image of the borehole trajectory in the first seismic section image, a position where the stratum is located, based on a stratum depth included in the data of the stratum, that is, a position where a depth indicated in the image of the borehole trajectory is the same as the stratum depth. Then, the upper computer can add a part of the section image of the stratum based on the stratum inclination angle and the stratum inclination in the data of the stratum at the position of the stratum in the image of the borehole track, so as to obtain a second seismic section image.

In another alternative implementation, referring to fig. 5, the process of generating the second seismic profile image by the upper computer based on the dip log data of the producing well and the first seismic profile image may include:

step 2061, obtaining a model image of the production well.

The upper computer can acquire an image of a borehole track of the production well, and then can add a partial section image of each stratum in a plurality of stratums penetrated by the production well on the image of the borehole track based on the formation dip angle logging data of the production well, so as to obtain a model image of the production well. That is, the model image may be generated based on an image of the wellbore trajectory of the production well, as well as the formation dip log data.

In an embodiment of the application, the upper computer may first obtain wellbore trajectory data of the production well and generate an image of the wellbore trajectory of the production well based on the wellbore trajectory data. Then, for the data of each of the plurality of strata penetrated by the production well in the formation dip angle logging data, the upper computer can determine the position of the stratum in the image of the borehole track based on the stratum depth in the data of the stratum. Then, the upper computer can add a part of section images of the stratum at the position of the stratum based on the stratum inclination angle and the stratum tendency in the data of the stratum, so as to obtain a model image of a production well.

The process of generating the image of the borehole trajectory of the production well by the upper computer based on the borehole trajectory data may refer to the implementation process of step 2052, which is not described herein again in this embodiment of the application.

Step 2062, generating a second seismic profile image based on the model image and the first seismic profile image.

After the upper computer obtains the model image of the production well, a second seismic section image can be generated based on the model image and the first seismic section image. Wherein the scale of the model image of the production well may be the same as the scale of the first seismic profile image.

In this embodiment, the host computer may use the image of the borehole trajectory of the production well as a reference, that is, the host computer may make the image of the borehole trajectory in the model image coincide with the image of the borehole trajectory in the first seismic section image, so as to add the model image to the first seismic section image, thereby obtaining the second seismic section image.

For example, the model image of the production well acquired by the upper computer may be as shown in FIG. 6. As can be seen from fig. 6, the partial sectional image intersecting the image 02 of the borehole trajectory of the production well comprises: a partial sectional image 05 of destination layer a, a partial sectional image 06 of destination layer B, and a partial sectional image 07 of destination layer C.

Assuming that the first seismic section image generated by the upper computer is shown in fig. 4, the second seismic section image obtained by the upper computer when the image of the borehole trajectory in the model image of the producing well shown in fig. 6 and the image of the borehole trajectory of the first seismic section image shown in fig. 4 are combined can be shown in fig. 7.

And step 207, if the first intersection point of the target stratum in the partial section image and the first straight line and the second intersection point of the target stratum in the partial section image and the second straight line are both located in the target stratum in the section image, determining that the geological structure type of the target stratum in the partial section image is a knee-fold structure.

In this embodiment, after obtaining the second seismic section image, the upper computer may detect whether the target formation in the partial section image (i.e., the partial section image of the target formation in the partial section image), the first intersection with the first straight line, and the second intersection with the second straight line in the partial section image are both located in the target formation in the section image, among the plurality of formations penetrated by the production well. If the upper computer determines that the first intersection point and the second intersection point are both located in the target stratum in the section image, the geological structure type of the target stratum in the section image can be determined to be a knee-fold structure. And then, the upper computer can determine that oil and gas exploitation can be continued, and then the oil and gas exploitation equipment can be controlled to carry out oil and gas exploitation.

Optionally, the upper computer may determine a first position of the first intersection point in the second seismic profile image and a second position of the second intersection point in the second seismic profile image. Also, the upper computer may determine a third intersection of the target earth formation in the sectional image (i.e., the sectional image of the target earth formation in the sectional image) and the first straight line, a third location in the second seismic sectional image, and a fourth intersection of the target earth formation in the sectional image and the second straight line, a fourth location in the second seismic sectional image.

Then, the upper computer may detect whether the first position and the third position are the same, and detect whether the second position and the fourth position are the same. If the upper computer determines that the first position is the same as the third position and the second position is the same as the fourth position, a first intersection point of the target stratum in the partial sectional image and the first straight line and a second intersection point of the target stratum in the partial sectional image and the second straight line can be determined to be located in the target stratum in the sectional image. That is, both ends of the partial sectional image of the target formation are located in the sectional image of the target formation, and then it may be determined that the geological structure type of the target formation in the partial sectional image is a knee-fold structure.

For example, assuming that the second seismic profile image generated by the upper computer is shown in fig. 6, it can be seen from fig. 6 that a first intersection point of the target formation and the first straight line, and a second intersection point of the target formation and the second straight line in the partial profile image of the target stratum a are both located in the profile image of the target stratum a, i.e. the geological structure type of the target stratum a passing through the production well and located on the wing is a knee fracture structure.

And a first intersection point of the target stratum in the partial sectional image of the target layer B and the first straight line and a second intersection point of the target stratum and the second straight line are positioned in the sectional image of the target layer B, namely the geological structure type of the target layer B passing through the production well and positioned on the wing part is a knee-fold structure.

And a first intersection point of the target stratum in the partial sectional image of the target layer C and the first straight line and a second intersection point of the target stratum and the second straight line are positioned in the sectional image of the target layer C, namely the geological structure type of the target layer C passing through the production well and positioned on the wing part is a knee-fold structure.

And step 208, if the first intersection point or the second intersection point is not located in the target stratum in the section image, determining that the geological structure type of the target stratum in the partial section image is a fault structure.

In this embodiment of the application, after obtaining the second seismic section image, if it is determined that a first intersection point of a target formation in the partial section image and the first straight line, or a second intersection point of the target formation in the partial section image and the second straight line is not located in the target formation in the section image, it may be determined that the geological structure type of the target formation in the partial section image is a fault structure.

Optionally, if the upper computer determines that the first position of the first intersection point in the second seismic profile image is different from the third position of the third intersection point in the second seismic profile image. Alternatively, the second intersection point is at a second position in the second seismic profile image different from a fourth position of the fourth intersection point in the second seismic profile image. The first intersection point may be determined and the second intersection point is not located in the target formation in the section image, and then the geological structure type of the target formation in the portion of the section image may be determined to be a fault structure.

Optionally, the order of the steps of the method for determining a knee-fold structure provided in the embodiment of the present application may be appropriately adjusted, and the steps may also be increased or decreased according to the circumstances. For example, steps 201 to 204 may be optionally deleted, and any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure shall be covered by the protection scope of the present disclosure, and thus, the detailed description thereof shall not be repeated.

The embodiment of the application provides a knee-fold structure determining device which can be arranged in an upper computer. Referring to fig. 8, the apparatus 300 may include:

an acquisition device 301 for acquiring a first seismic profile image of a production well, the first seismic profile image comprising: the method comprises the following steps of (1) obtaining an image of a borehole trajectory of a production well, sectional images of a plurality of strata at the position of the production well, and a first straight line and a second straight line in the sectional images, wherein the first straight line respectively penetrates through first stratum corners of the plurality of strata, the second straight line respectively penetrates through second stratum corners of the plurality of strata, the first stratum corners of the same stratum are adjacent to the second stratum corners, the first stratum corners of the plurality of strata have the same orientation, and the second stratum corners of the plurality of strata have the same orientation;

a generating module 302, configured to generate a second seismic profile image based on the dip-angle logging data of the producing well and the first seismic profile image, where the second seismic profile image includes: a part of the section images of the plurality of strata, which is located between the first straight line and the second straight line;

the first determining module 303 is configured to determine that the knee-fold structure of the target formation in the partial cross-sectional image is the knee-fold structure if a first intersection point of the target formation in the partial cross-sectional image and the first straight line and a second intersection point of the target formation in the partial cross-sectional image and the second straight line in the plurality of formations penetrated by the production well are located in the target formation in the cross-sectional image.

In summary, the present application provides an apparatus for determining knee bend configuration, which may generate a second seismic profile image including a partial profile image between a first line and a second line based on a stratigraphic dip log data of a production well and the first seismic profile image. Because the partial cross-sectional image is obtained based on the dip log data of the producing well, the partial cross-sectional image can accurately represent the condition of the stratum penetrated by the producing well. Thereby, it can be ensured that the device is able to accurately determine whether the configuration type of the wing through which the production well passes is a knee fold configuration based on the second seismic profile image comprising the partial profile image. Compared with the method that in the related art, the worker determines the knee fold structure according to the fuzzy image of the wing part, the device provided by the embodiment of the application effectively improves the accuracy of determining the knee fold structure.

Optionally, the generating module 302 may be configured to:

obtaining a model image of the production well, wherein the model image is generated based on an image of a well track of the production well and formation dip logging data;

based on the model image and the first seismic profile image, a second seismic profile image is generated.

Optionally, the process of obtaining the model image of the production well by the generation module 302 may include:

Fig. 9 is a block diagram of another knee-fold configuration determination device provided in an embodiment of the present application, which may be disposed in an upper computer. Referring to fig. 9, the apparatus may further include:

a second determining module 304, configured to determine a first position of the first intersection point in the second seismic profile image and a second position of the second intersection point in the second seismic profile image;

a third determining module 305, configured to determine a third intersection point of the target formation in the cross-sectional image and the first straight line, a third position in the second seismic cross-sectional image, and a fourth intersection point of the target formation in the cross-sectional image and the second straight line, a fourth position in the second seismic cross-sectional image;

a fourth determining module 306, configured to determine that the first intersection point and the second intersection point are both located in the target formation in the cross-sectional image if the first position is the same as the third position and the second position is the same as the fourth position.

Optionally, the first obtaining module 301 may be configured to:

generating an initial seismic profile image based on the seismic data, the initial seismic profile image comprising: a plurality of cross-sectional images of the earth formation; adding an image of the wellbore trajectory of the production well on the initial seismic profile image based on the wellbore trajectory data of the production well; adding a first straight line on the initial seismic section image; and adding a second straight line on the initial seismic section image to obtain a first seismic section image of the production well.

Optionally, the first obtaining module 301 may be configured to: if the formation traversed by the production well is continuous, a first seismic profile image of the production well is acquired.

Optionally, referring to fig. 9, the apparatus 300 may further include:

a second obtaining module 307, configured to obtain a log of the production well, where the log includes: at least one of a natural gamma log, a sonic log, and a resistivity log;

a fifth determination module 308 to determine that the plurality of formations traversed by the production well are consecutive if it is determined based on the log that formation times of the plurality of formations traversed by the production well one by one increase in sequence; if it is determined based on the log that the formation times for the plurality of formations traversed by the production well one by one have not sequentially increased, then it is determined that the plurality of formations traversed by the production well are not contiguous.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the apparatus and the modules described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

Fig. 10 is a block diagram of a device for determining a knee-fold configuration according to an embodiment of the present disclosure, and referring to fig. 7, the device 400 may include: a processor 401, a memory 402 and a computer program stored on the memory 402 and operable on the processor 401, the processor 401 when executing the computer program may implement the knee-fold configuration determining method provided by the above method embodiments, for example, the method shown in fig. 1 or fig. 2.

Embodiments of the present application also provide a computer-readable storage medium, which stores instructions that, when executed on a computer, cause the computer to execute the method for determining a knee-fold configuration provided in the above method embodiment, for example, the method shown in fig. 1 or fig. 2.

Embodiments of the present application further provide a computer program product containing instructions, which when run on a computer, causes the computer to execute the method for determining a knee-fold configuration provided by the above method embodiments, for example, the method shown in fig. 1 or fig. 2.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of determining a knee fold configuration, the method comprising:

2. The method of claim 1, wherein generating a second seismic profile image based on the dip log data for the producing well and the first seismic profile image comprises:

3. The method of claim 2, wherein the obtaining the model image of the production well comprises:

4. The method of claim 1, further comprising:

5. The method of claim 1, wherein the acquiring a first seismic profile image of the production well comprises:

adding the first straight line on the initial seismic section image;

6. The method of any one of claims 1 to 5, wherein the acquiring a first seismic profile image of a production well comprises:

7. The method of claim 6, further comprising:

8. The method of any one of claims 1 to 5, wherein the first line and the second line are both bisectors of an angle.

9. A knee fold configuration determination device, the device comprising:

10. A computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to execute the knee fold configuration determining method according to any one of claims 1 to 8.