CN114763744A - Glutenite reservoir connectivity description method based on mudstone division - Google Patents
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Abstract
The invention provides a glutenite reservoir connectivity description method based on mudstone division, which comprises the following steps: step 1, observing a logging curve, and judging a stratum met by a single well drill; step 2, multi-well comparison and combination stabilization of the shale layer; step 3, comprehensively considering a sedimentary model, and performing mudstone layer distribution description through well-seismic combination; step 4, taking the stable mudstone as an interlayer partition, and performing periodic division on the conglomerate body; and 5, verifying the description result of the reservoir connectivity through the means of dynamic development and monitoring. The glutenite reservoir connectivity description method based on mudstone division has the advantages of clear thought, simple operation and low result multi-solution, provides a feasible method for accurately describing the glutenite reservoir connectivity, and provides geological support for the water injection development of the glutenite reservoir.
Description
Technical Field
The invention relates to the field of conglomerate reservoir identification, in particular to a conglomerate reservoir connectivity description method based on mudstone division.
Background
The glutenite fan body generally refers to a single fan body or a fan group which is mutually interlaced and superposed and is formed by rapidly piling up on water or under water in a steep slope zone of a subsidence basin, such as a alluvial fan, a turbid sediment fan, a fan delta, an offshore underwater fan and the like with different deposition types, and mainly refers to a blocky geological rock body which is formed by sandstone and glutenite. The conglomerate oil deposit formed by the conglomerate fan body has the characteristics of complex geological structure, large reservoir thickness, quick lithofacies change and strong heterogeneity, and belongs to the oil deposit with larger development difficulty. Such reservoirs are found both at home and abroad. In recent years, the proportion of gravel rock oil hidden in newly discovered and newly developed oil reservoirs in China is increasing. Therefore, the method has important significance in realizing the high-efficiency development of the conglomerate oil reservoir.
Different from conventional sandstone, the glutenite oil deposit is formed by rapid gravity flow deposition of incident stacking, the reservoir layering is poor, the communication relation is complex, the conventional logging curve has poor circularity, no obvious characteristics, the marker layer is difficult to determine, the single well period is difficult to divide, the interwell strata are difficult to compare, and the reservoir connectivity is difficult to predict. Based on the characteristics, the conglomerate oil reservoir period sub-division precision and the inner curtain research precision are low, and the requirement of daily water injection development work is difficult to meet, so that the injection and extraction effect of the oil reservoir is not obvious in the development process, the elastic development situation is integrally presented, and the degressive speed is fast. Therefore, accurately describing the connectivity of the glutenite reservoir becomes a premise for realizing the high-efficiency development of the glutenite reservoir and is a geological foundation for improving the recovery ratio.
The existing glutenite reservoir connectivity description method starts from the perspective of reservoir identification, establishes a relatively accurate sedimentary model, determines reservoir boundaries through seismic data, and further subdivides the reservoir by using core data and the like. However, when the method is applied to the conglomerate oil reservoir with complex lithology, the reservoir identification accuracy is reduced, and the communication body description result cannot be effectively verified in the development process.
In the application No.: CN201910950292.8, chinese patent application, relates to a reservoir connectivity analysis method, which comprises the following steps: s1, establishing a reservoir physical property parameter knowledge base; s2, establishing a reservoir physical property prototype model; s3, carrying out model quality inspection on all the physical prototype models, and preferably selecting a final prototype model; s4, coarsening the optimized prototype model, applying the coarsened model to a numerical simulation technology, and optimizing the parameter combination of the coarsened model through numerical simulation; and S5, analyzing the numerical simulation result and determining the connectivity of the reservoir.
In the application No.: in the chinese patent application No. cn201910276171.x, it relates to a method and apparatus for seismic identification of connectivity of a solution reservoir, the method includes: constructing a seismic maximum likelihood body based on the three-dimensional seismic data body; carrying out space carving on the seismic maximum likelihood body by utilizing a threshold value of the attribute of the seismic maximum likelihood body to obtain a space profile of the solution breaking body; selecting a first point and a second point which are positioned at the same altitude in a solution breaking space, and acquiring the formation pressure at the first point and the formation pressure at the second point; and comparing the formation pressure at the first point with the formation pressure at the second point, and judging whether the reservoirs between the first point and the second point are communicated or not according to the comparison result.
In the application No.: CN202010189180.8, which is a chinese patent application, relates to a method for automatically identifying a reservoir configuration interface in a reservoir geological model, and the method for automatically identifying a reservoir configuration interface in a reservoir geological model comprises: step 1, initializing basic parameters; step 2, traversing the grid according to the IJK; step 3, traversing the grid of the configuration geometry body formed in the step 2; step 4, traversing the configuration body geometry grid set generated in the step 3 to generate a configuration body boundary grid set; and 5, adding the generated terrain geometry into the configuration body set established in the step 1, returning to the step 2, and continuously traversing the grids until all the grids are traversed and stored.
The prior art is greatly different from the method, and the technical problem which is required to be solved by the inventor is not solved, so that a novel marlite reservoir connectivity description method based on mudstone division is invented.
Disclosure of Invention
The invention aims to provide a mudstone-division-based glutenite reservoir connectivity description method for describing reservoir connectivity by dividing a glutenite reservoir period secondary inner curtain by using mudstones.
The object of the invention can be achieved by the following technical measures: a glutenite reservoir connectivity description method based on mudstone division comprises the following steps:
step 1, observing a logging curve, and judging a stratum met by a single well drill;
step 2, multi-well comparison and combination stabilization of the shale stratum;
step 3, comprehensively considering a sedimentary model, and performing mudstone layer distribution description through well-seismic combination;
and 5, verifying the description result of the reservoir connectivity through the means of dynamic development and monitoring.
The object of the invention can also be achieved by the following technical measures:
in the step 1, the stratum met by the single-well drill is judged by utilizing effective logging curves of acoustic time difference, neutrons, density three-porosity, natural potential and microelectrodes, and the reservoir stratum and the mud rock stratum are identified.
In the step 1, a drilling well section with a negative abnormity of a natural potential curve is a sand body, and the three-porosity curve has higher contact ratio and reflects better stratum physical property of the section; on the contrary, the part with the straight natural potential curve and the dispersed three-porosity curve is a mudstone stratum.
In the step 2, well points in different sedimentary areas are selected as standard wells according to the characteristic that the mudstone gradually grows and thickens from the core part to the fan end, the characteristic of stratum change is visually reflected through multi-well curve comparison, and the mudstone with relatively stable growth is identified as a comparison mark and combined.
In step 3, a conglomerate sector deposition mode is comprehensively considered, mud rock stratum distribution description is carried out in a phase control mode through a well-seismic combination means, and the mud rock stratum in the whole area is unified and closed under the constraint of seismic data.
In step 3, the reservoir stratum presents high resistivity in the logging response, and three porosity curves of acoustic time difference, neutrons and density are basically superposed; the seismic profile is shown as broad, with no apparent clutter and weak reflections of the reflection axis.
In the step 3, the resistivity of the mudstone in the logging response is low, and the three porosity curves of the acoustic time difference, the neutrons and the density are dispersed; the seismic section shows that the seismic axis reflection is clear and the continuity is good.
In step 3, identifying and numbering mudstone encountered by standard well drilling according to different characteristics of the mudstone and the reservoir in logging response and seismic phases, tracking the mudstone according to the number, establishing a longitudinal and plane distribution mode of the mudstone by combining the deposition characteristics of a glutenite fan body, closing the mudstone layer in the whole area, completing layer unification division, and establishing a stratum framework.
In step 4, the internal development of the stable mudstone is communicated with the secondary sector period, fractures in the same period are improved in the stratum fracturing process, the connectivity is improved, the connectivity of the reservoir is described on the basis, and the accuracy is improved.
In step 5, referring to the description result of the reservoir connectivity, and according to the principles of corresponding stage and advanced water injection, preferably selecting wells with more production well sections and less mudstone interlayers in the same stage for re-injection so as to achieve higher injection-production corresponding rate; after the injection and production adjustment is carried out on the well group, the production condition is closely concerned, and the verification of the reservoir connectivity is further completed by developing the effective characteristics by utilizing the monitoring means in due time.
According to the glutenite reservoir connectivity description method based on mudstone division, on the basis of identifying the glutenite reservoir by using conventional seismic facies data, the mudstone in the glutenite reservoir is screened and combined, relatively stable mudstone is selected for layer unification, and the stratum period is divided. The mudstone contrast mode is taken as a basis, development data verification is combined, and then reservoir connectivity description is completed. The method has the advantages of clear thought, simpler operation and lower result multi-solution, provides a feasible method for realizing accurate description of the conglomerate reservoir connectivity, and provides geological support for conglomerate reservoir water injection development. The method is applied to a salt field salt 22 block of a salt home oil production plant of a Dongxin oil production plant of a Shengli oil field, injection and production adjustment of a developed well group is completed, and a transfer injection well has primary effect on a corresponding oil well.
Drawings
FIG. 1 is a flow chart of an embodiment of a mudstone-compartmentalization-based glutenite reservoir connectivity description method of the present invention;
FIG. 2 is a schematic illustration of a single well formation encounter in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of the development pattern of the mudstone in the glutenite sector according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a multi-well comparison in one embodiment of the present invention;
FIG. 5 is a schematic diagram of the well-to-seismic and impact mudstone distribution according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of a conglomerate sector deposition pattern in accordance with an embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating connectivity analysis and development verification principles in an embodiment of the present invention;
FIG. 8 is a schematic illustration of the reservoir of mudstone with internal communication and external non-communication for a salt 22-deviated 47 well group according to an embodiment of the invention;
FIG. 9 is a schematic diagram of advanced waterflooding of a reservoir with and without communication between the interior of mudstone reservoirs of the salt 22-23 well groups in an embodiment of the present invention;
FIG. 10 is a schematic diagram of a salt 22-slant 62 well group three-porosity curve for determining disconnected reservoir development caused by poor reservoir development in an embodiment of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the features, steps, operations and/or combinations thereof.
As shown in fig. 1, fig. 1 is a flow chart of a mudstone-compartmentalization-based glutenite reservoir connectivity description method of the present invention.
101, judging the stratum met by the single-well drilling by utilizing the effective logging curves such as acoustic time difference, neutrons, density three-porosity, natural potential, microelectrodes and the like, and identifying a reservoir stratum and a mud rock stratum;
102, comparing multiple wells, summarizing an evolution rule of a mudstone layer, selecting stable mudstones of a gravel rock inner curtain and combining the stable mudstones;
103, comprehensively considering a conglomerate fan body deposition mode, performing mudstone layer distribution description in a phase control mode by means of well-seismic combination, and completing the unification and closure of the mudstone layer in the whole area under the constraint of seismic data;
104, dividing stratum stages by taking the stable mudstone as an interlayer partition, and describing reservoir connectivity in each stage;
and 105, verifying the description result of the reservoir connectivity through means of dynamic development, monitoring and the like.
Example 1:
in an embodiment to which the present invention is applied, the mudstone division-based glutenite reservoir connectivity description method of the present invention includes the following steps:
step 1, observing a logging curve, and judging a stratum encountered by a single well. And analyzing the stratum met by the single-well drilling by utilizing the acoustic time difference, the neutron and density three-porosity curve, the natural potential, the microelectrode and other effective logging curves, and identifying the reservoir and the mudstone. The drilling section with the negative abnormity of the natural potential curve is a sand body, and the higher coincidence degree of the three-porosity curve reflects the better formation physical property of the section. On the contrary, the part with the straight natural potential curve and the dispersed three-porosity curve is a mudstone stratum, as shown in fig. 2.
And 2, performing multi-well comparison and combining the stabilized mud rock stratum. The stable mudstone can wrap the sand body in the development process, and is scattered and recombined, and the development mode is shown in figure 3. According to the characteristic that the mudstone gradually grows and thickens from the core part to the fan end, well points in different sedimentary areas are selected as standard wells, the characteristics of stratum change can be visually reflected through multi-well curve comparison, and the mudstone with stable growth is identified as a comparison mark and combined, as shown in fig. 4.
And 3, comprehensively considering the sedimentary model, and describing the distribution of the mudstone layer by combining well vibration and earthquake. The reservoir stratum presents high resistivity in the logging response, and three porosity curves of the acoustic time difference, the neutrons and the density are basically superposed; the seismic profile is shown as broad, with no apparent clutter and weak reflections of the reflection axis. The resistivity of the mudstone in the logging response is low, and the three porosity curves of the acoustic time difference, the neutrons and the density are dispersed; the seismic section shows that the seismic axis reflection is clear and the continuity is good. And identifying and numbering the mudstones encountered by the standard well drilling according to different characteristics of the mudstones and the reservoir in the logging response and the seismic phase, and tracking the mudstones according to the numbers, as shown in figure 5. And (3) establishing a longitudinal and plane spreading mode of mudstone by combining the characteristics of conglomerate sector sedimentation, closing mudstone layers in the whole region, completing layer division, and establishing a stratum framework as shown in fig. 6.
And 4, taking the stable mudstone as an interlayer partition, and performing periodical division on the glutenite body. By comparing actual production conditions, the internal development of the stable mudstone is communicated with the secondary sector period, the cracks in the same period can be improved in the stratum fracturing process, and the connectivity is improved. And reservoir connectivity is described on the basis, so that the accuracy can be improved. As shown in fig. 7, mode 1 is stable mudstone, and the perforation section of the No. 1 well 1-3 is not communicated with the perforation section of the No. 2 well; and if the mode 2 is unstable mudstone, the mudstone does not play a role in sealing, and the 3 # well 3-2 perforation segment, the 4 # well 4-2 perforation segment and the 5 # well 5-2 perforation segment are communicated with each other.
And 5, verifying the description result of the reservoir connectivity by means of dynamic development, monitoring and the like. Referring to the description result of the reservoir connectivity, according to the principle of "corresponding to the phase and advanced water injection", the wells with more production well sections and less mudstone separation layers are preferably selected for injection transfer in the same phase so as to achieve higher injection-production corresponding rate, as shown in fig. 7. After injection and production adjustment is carried out on the well group, production conditions are closely concerned, and verification of reservoir connectivity is further completed by developing effective characteristics by utilizing monitoring means in due time.
Example 2:
in the specific embodiment 2 applying the invention, the same comparison idea is adopted, after the stable mudstone is judged by the combination of well logging identification of the sand mudstone and well-seismic, the stable mudstone No. 6 mudstone is divided, the newly-put production section of the salt 22-inclined 49 well 2010.02 and the water injection section of the salt 22-inclined 47 well are in the same communicating body, and the production layer of the salt 22-inclined 49 well is flooded with water; 2012.11 salt 22-slant 49 well was returned to production of the upper reservoir of mudstone No. 6, which was not flooded, producing low energy and low fluid with characteristic properties, consistent with the analytical connectivity, as shown in fig. 8.
Example 3:
in the specific embodiment 3 applying the invention, the 3370-3400 meter perforated section of the salt 22-23 well is injected with water, and is located between the No. 6 stable mudstone and the No. 7 stable mudstone with the production section 3430-3532 meter of the salt 22-slant 47 well, and the analysis shows that reservoirs between the No. 6 stable mudstone and the No. 7 stable mudstone are mutually communicated, the salt 22-slant 47 well takes effect obviously in the production process, the liquid amount is increased from 6.3 to 7.8, the daily oil is increased from 4.1 to 5.1 tons, the area of the indicator diagram is obviously increased, meanwhile, the No. 7 stable mudstone and the No. 8 stable mudstone are produced without perforated section of the salt 22-slant 47 well, the water is injected from the early stage of the salt 22-23 well, the energy is supplemented for the late stage upward production of the salt 22-slant 47 well, and the development effect is improved, as shown in FIG. 9.
Example 4:
in the specific embodiment 4 applying the method, reservoir evaluation is performed on the salt 22-deviated 62 well group, the stable mudstone No. 8 and 9 internal reservoirs are analyzed in the step 1, the acoustic wave time difference, the neutron density three-porosity and the natural potential show that the reservoir corresponding to the well salt 22-42 well production interval 3334 and 3550 meters is thin in development and high in argillaceous content, and the analysis shows that the reservoir of the two well production sections is unstable in development, so that the connectivity is poor. No water injection effect characteristics of the salt 22-inclined 62 well are found in the salt 22-42 well in the production process, and the dynamic verification is consistent with the analysis, as shown in figure 10.
The invention provides a glutenite reservoir connectivity description method, which solves the problems of difficult stratum comparison and difficult reservoir connectivity description of the glutenite reservoir, utilizes relatively stable mudstones to divide a stratum framework, completes the description of the reservoir connectivity on the basis, realizes effective injection and production correspondence in the glutenite reservoir development process, and achieves the aim of improving the recovery ratio.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
Claims (10)
1. A glutenite reservoir connectivity description method based on mudstone partition is characterized by comprising the following steps:
step 1, observing a logging curve, and judging a stratum encountered by a single well drill;
step 2, multi-well comparison and combination stabilization of the shale layer;
step 3, comprehensively considering a sedimentary model, and performing mudstone layer distribution description through well-seismic combination;
step 4, taking the stable mudstone as an interlayer partition, and performing periodic division on the conglomerate body;
and 5, verifying the description result of the reservoir connectivity through dynamic development and monitoring.
2. The mudstone-division-based glutenite reservoir connectivity description method according to claim 1, wherein in step 1, effective well logging curves of acoustic time difference, neutrons, density porosity, natural potential and microelectrodes are used for judging the stratum met by the single-well drilling and identifying the reservoir and the mudstone layer.
3. The glutenite reservoir connectivity description method based on mudstone partition of claim 2, wherein in step 1, a drilling section with a negative anomaly of a natural potential curve is a sand body, and the higher coincidence degree of the three-porosity curve reflects better formation physical property of the section; on the contrary, the part with the straight natural potential curve and the dispersed three-porosity curve is a mudstone stratum.
4. The glutenite reservoir connectivity description method based on mudstone partitioning as claimed in claim 1, wherein in step 2, well points of different sedimentary areas are selected as standard wells according to the characteristic that the mudstone gradually grows and thickens from the core to the fan end, the characteristic of stratum change is visually reflected through multi-well curve comparison, and mudstones with stable development are identified as comparison marks and combined.
5. The glutenite reservoir connectivity description method based on mudstone partitioning as claimed in claim 1, wherein in step 3, a glutenite sector deposition mode is comprehensively considered, mudstone distribution description is performed through a means of well-seismic combination in a phase control mode, and the unification and closure of the mudstone of the whole area are completed under the constraint of seismic data.
6. The mudstone-partitioning-based glutenite reservoir connectivity description method of claim 5, wherein in step 3, the reservoir exhibits high resistivity in the logging response, and the three porosity curves of acoustic moveout, neutron and density are substantially coincident; the seismic profile is shown as broad, with no clutter and weak reflections from the apparent reflection axis.
7. The mudstone-partitioning-based glutenite reservoir connectivity description method of claim 6, wherein in the step 3, the mudstone has low resistance in logging response, and the three-porosity curves of acoustic time difference, neutrons and density are dispersed; the seismic section shows that the seismic axis reflection is clear and the continuity is good.
8. The glutenite reservoir connectivity description method based on mudstone partitioning as claimed in claim 7, wherein in step 3, the mudstone encountered by the standard well drilling is identified and numbered according to the different characteristics of the mudstone and the reservoir in the logging response and seismic phase, the mudstone is tracked according to the number, the mudstone longitudinal and plane spreading mode is established by combining the glutenite sector deposition characteristics, the mudstone layer is closed in the whole area, the uniform layer partitioning is completed, and the stratum framework is established.
9. The glutenite reservoir connectivity description method based on mudstone partitioning as claimed in claim 1, wherein in step 4, the internal development of the mudstone is stabilized to connect with the secondary sector period, fractures in the same period are modified in the formation fracturing process, connectivity is improved, reservoir connectivity is described on the basis, and accuracy is improved.
10. The glutenite reservoir connectivity description method based on mudstone division according to claim 1, wherein in step 5, referring to the description result of reservoir connectivity, according to the principle of corresponding phase and advanced water injection, the wells with more production well sections and less mudstone separation layers are preferably selected for re-injection in the same phase so as to achieve higher injection-production corresponding rate; after the injection and production adjustment is carried out on the well group, the production condition is closely concerned, and the verification of the reservoir connectivity is further completed by developing the effective characteristics by utilizing the monitoring means in due time.
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