CN107288631A - Prime stratum obliquity correcting method at a kind of well point - Google Patents
Prime stratum obliquity correcting method at a kind of well point Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The present invention relates to prime stratum obliquity correcting method at a kind of well point, its step：1) azimuth and inclination angle of construction face at well point are extracted；2) azimuth and inclination angle of current position aspect at well point are extracted based on existing dipmeter logging data；3) prime stratum inclination angle theta is corrected；4) using radian and angle reduction formula, the result of calculation of prime stratum inclination angle theta is converted into angle by radian；If 90 ° of prime stratum inclination angle theta ＞ after conversion, it is prime stratum inclination angle to take its supplementary angle.The present invention can be to prime stratum dip correction, operating process simplification, procedure.
Description
Technical Field
The invention relates to the technical field of oil and gas field exploration and development, in particular to a method for correcting an original stratum inclination angle at a well point.
Background
The stratum is a layered rock or a deposit formed in a certain generation of geological history, and the stratum inclination angle refers to an included angle between the declination direction of the maximum inclination line of the stratum surface and the projection line of the maximum inclination line on the horizontal plane. The stratum inclination angle has wide application in the field of oil and gas field exploration and development, for example, bedding is an important sedimentary structure phenomenon in sedimentary rocks, the bedding structure of the sedimentary rocks is researched by utilizing the stratum inclination angle, the ancient water flow direction and hydrodynamic force conditions are analyzed, the carrying direction and the sedimentary environment of sediments are known, and a favorable exploration direction can be guided; the fluvial facies reservoir is an important reservoir type, the internal structure of the meandering stream point dam is researched by utilizing the stratigraphic dip angle, the side volume direction and the side packed layer scale of the point dam can be analyzed, and the fluvial facies reservoir configuration dissection and interlayer research are effectively guided. However, post formation movement can cause the formation to further tilt or even reverse, destroying the original tilt of the formation. Therefore, in the exploration and development process of oil and gas fields, in order to obtain initial formation information, the original formation dip angle correction is required.
When the structural surface inclination angle is small, the influence on the inclination angle of the original stratum is small, and a geologist often adopts the inclination angle of the current stratum surface to approximately replace the original stratum inclination angle; when the dip angle of the structural surface is large, especially the difference between the azimuth angle and the formation azimuth angle is large, the influence on the dip angle of the original formation is large, and even the formation inclination is reversed. However, for the original formation dip correction, only scattered calculation formulas exist at present, and no systematic correction method and flow exist.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for correcting an original formation dip at a well point, which can correct the original formation dip and has a simplified and streamlined operation process.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for correcting the inclination angle of an original stratum at a well point is characterized by comprising the following steps: 1) extracting an azimuth angle and an inclination angle of a structural surface at a well point; 2) extracting an azimuth angle and an inclination angle of a current stratum surface at a well point based on existing inclination angle logging data; 3) correcting an original stratum inclination angle theta; 4) converting the calculation result of the original formation dip angle theta in the step 3) into an angle from the radian by utilizing a radian and angle conversion formula; and if the converted original formation dip angle theta is larger than 90 degrees, taking the supplementary angle as the original formation dip angle.
Further, in the step 1), the data of the construction surface and the well data at the well point are imported into a Petrel platform, the data of the construction surface at the well point is imported into a well point report by using the platform, and the azimuth angle of the construction surface at the well point is extractedAnd inclination angle α of formation face at well point1。
Further, in the step 2), stratum layered data at the well point and dip angle logging data at the well point are imported into a Petrel platform, and in the attribute of the layered data, the azimuth angle of the current stratum surface at the well point is extracted by using the attribute operation of the azimuth angleExtracting α dip angle of current stratum surface at well point by using attribute operation of stratum dip angle2。
Further, in the step 3), the original formation dip angle θ at the well point is an included angle between the structural surface at the well point and the current stratum surface.
Further, the calculation process of the included angle between the well point structural surface and the current stratum surface is as follows: 3.1) simplify the tectonic surface and the current formation surface at the well point into two planes: 3.2) solving normal vectors of the two planes; and 3.3) solving the included angle of the normal vectors of the two planes, namely the original formation dip angle theta.
Further, in the step 3.1), the structural surface at the well point is simplified to be a plane a, and the azimuth angle isThe angle of inclination is α1(ii) a Simplifying the current formation level at the well point to plane B, with an azimuth ofThe angle of inclination is α2：
The equation for plane A is:
the equation for plane B is:
wherein, a1、a2、b1、b2、c1、c2Are all constants.
Further, in the step 3.2), the normal vector of the plane AComprises the following steps:
wherein,
normal vector of plane BComprises the following steps:
wherein,
further, in the step 3.3), the original formation dip angle θ is:
wherein,
further, in the step 4), a conversion formula of the radian and the angle is as follows: the angle is radian x 180 °/pi.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the azimuth angle and the inclination angle of the construction surface at the well point are extracted by using Petrel E & PSOFFLEXE Platform 2014 software, the azimuth angle and the inclination angle of the current stratum surface at the well point are obtained by using the inclination angle logging data, and the basic data are simple and easy to obtain; 2. the original stratum inclination angle is corrected by using a calculation formula, and the operation process is simplified and streamlined. In conclusion, the method can be widely applied to the correction of the original stratum inclination angle at the well point.
Drawings
FIG. 1 is a schematic overall flow diagram of the present invention;
FIG. 2 is a schematic diagram of a raw formation dip correction in an embodiment of the present invention.
FIG. 3 is a schematic view of plane A in an embodiment of the present invention;
FIG. 4 is a schematic view of plane B in an embodiment of the present invention;
FIG. 5 is a schematic diagram of the angle between two planes in an embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in FIG. 1, the present invention provides a method for correcting the dip angle of a virgin formation at a well point, comprising the steps of:
1) extracting the azimuth angle and the inclination angle of the structural surface at the well point: leading the data of the construction surface and the well data at the well point into a Petrel platform, leading the data of the construction surface at the well point into a well point report by using the platform, and extracting the azimuth angle of the construction surface at the well pointAnd inclination angle α of formation face at well point1；
Wherein, the Petrel Platform adopts Petrel E & P Software Platform 2014 Software.
2) Extracting the azimuth angle and the dip angle of the current stratum surface at the well point based on the existing dip angle logging data: importing stratum hierarchical data at a well point and dip angle logging data at the well point into a Petrel platform, and extracting an azimuth angle of a current stratum surface at the well point by using azimuth angle attribute operation in attributes of the hierarchical dataExtracting α dip angle of current stratum surface at well point by using attribute operation of stratum dip angle2。
3) Correcting the original formation dip angle: using azimuth angle of formation face at well pointAnd an angle of inclination α1And azimuth angle of current ground planeAngle of inclination α2And correcting the original formation dip angle theta at the well point.
The original formation dip angle theta at the well point can be regarded as an included angle between a constructed surface at the well point and a current stratum surface, and the calculation process is as follows:
3.1) simplify the tectonic surface and the current formation surface at the well point into two planes: the construction surface at the well point is simplified into a plane A, and the azimuth angle isThe angle of inclination is α1(ii) a Simplifying the current formation level at the well point to plane B, with an azimuth ofThe angle of inclination is α2。
Wherein the equation for plane a is:
the equation for plane B is:
wherein, a1、a2、b1、b2、c1、c2Are all constants.
3.2) solving the normal vectors of two planes:
normal vector of plane AComprises the following steps:
wherein,
normal vector of plane BComprises the following steps:
wherein,
3.3) calculating the included angle of two planes: angle between plane A and plane B, i.e. normal vectorAnd the normal vectorThe included angle of (a). According to the vector algorithm:obtaining two normal vector included angles theta:
wherein,
the original formation dip angle θ is then:
4) conversion of radian and angle: converting the calculation result of the original stratum correction inclination angle theta in the step 3) into an angle from radian by using a radian and angle conversion formula; and if the converted original formation dip angle theta is larger than 90 degrees, taking the supplementary angle as the original formation dip angle.
In the step 4), the conversion formula of the radian and the angle is as follows: the angle is radian x 180 °/pi.
Example (b): as shown in FIG. 2, the method for correcting the dip angle of the original stratum at the well point of the invention is further illustrated by taking the Asm3 stratum at the M well of a certain oil field in the south of Canada as an example.
The M wells of a certain oil field in the south of Canada have well point coordinates, well trajectory, offset elevation, stratifying and dip logging data, and the oil field has tectonic surface data of the Asm3 formation.
For the Asm3 formation at well a in this region, the original formation dip correction procedure of the present invention is as follows:
1) extracting the azimuth angle and the inclination angle of the structural surface at the well point: petrel E (well point coordinates, well trajectory and filling elevation) of construction surface data of Asm3 stratum and well data of M wells&P Software Platform 2014, extracting the azimuth angle of the construction surface at the well point by using intersection point operation of the well track and the construction surfaceAnd an angle of inclination α1＝2.05°。
2) Extracting the azimuth angle and the inclination angle of the current stratum surface at the well point based on the inclination angle logging data: importing hierarchical data and dip angle logging data of M wells into Petrel E&P Software Platform 2014, extracting the azimuth angle of the current stratum at the well A by using the azimuth angle attribute operation in the attribute of the layered dataExtracting α inclination angle of current stratum at well A by utilizing attribute operation of stratum inclination angle2＝6.85°。
3) Correcting virgin earth formationInclination angle: using azimuth angle of formation face at well pointAnd an angle of inclination α1And azimuth angle of current ground planeAngle of inclination α2And calculating the original formation dip angle theta at the well point.
As shown in fig. 1, in step 3), the original formation dip angle θ at the well point may be regarded as an included angle between the formation surface at the well point and the current formation surface, and the calculation process is as follows:
3.1) simplify the tectonic surface and the current formation surface at the well point into two planes: the construction surface at the well point is simplified into a plane A, and the azimuth angle isThe angle of inclination is α12.05 °; simplifying the current formation level at the well point to plane B, with an azimuth ofThe angle of inclination is α2＝6.85°；
3.2) solving normal vectors of two planes, as shown in FIGS. 3 and 4;
3.3) calculating the included angle of two planes: as shown in fig. 5, willα1＝2.05°，α2The calculation formula of the included angle between the two planes is substituted by 6.85 degrees, and the included angle theta between the two planes is obtained to be 2.99.
And the included angle theta between the two planes is 2.99, namely the original formation dip angle at the well point.
4) Conversion of radian and angle: converting the calculation result of the original formation inclination angle theta in the step 3) from radian 2.99 to an angle 171.26 degrees by using a radian and angle conversion formula; since the converted original formation dip angle is 171.26 degrees > 90 degrees, the complementary angle is 8.74 degrees.
Through the steps, the original formation dip angle of the Asm3 formation at the M well of a certain oil field in the south of Canada in the embodiment is 8.74 degrees.
In summary, the invention extracts the azimuth angle and the inclination angle of the structural surface at the well point by using the Petrel platform, obtains the azimuth angle and the inclination angle of the current stratum surface at the well point by using the inclination angle logging data, and has simple and easily-obtained basic data; the original stratum inclination angle is corrected by using a calculation formula, and the operation process is simplified and streamlined.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (9)
1. A method for correcting the inclination angle of an original stratum at a well point is characterized by comprising the following steps:
1) extracting an azimuth angle and an inclination angle of a structural surface at a well point;
2) extracting an azimuth angle and an inclination angle of a current stratum surface at a well point based on existing inclination angle logging data;
3) correcting an original stratum inclination angle theta;
4) converting the calculation result of the original formation dip angle theta in the step 3) into an angle from the radian by utilizing a radian and angle conversion formula; and if the converted original formation dip angle theta is larger than 90 degrees, taking the supplementary angle as the original formation dip angle.
2. The method of correcting a raw formation dip at a well site of claim 1, wherein: in the step 1), the data of the construction surface and the well data at the well point are imported into a Petrel platform, the data of the construction surface at the well point is imported into a well point report by using the platform, and the azimuth angle of the construction surface at the well point is extractedAnd inclination angle α of formation face at well point1。
3. The method of correcting a raw formation dip at a well site of claim 1, wherein: in the step 2), stratum hierarchical data at the well point and dip angle logging data at the well point are imported into a Petrel platform, and the azimuth angle of the current stratum surface at the well point is extracted by utilizing the attribute operation of the azimuth angle in the attribute of the hierarchical dataExtracting α dip angle of current stratum surface at well point by using attribute operation of stratum dip angle2。
4. The method of correcting a raw formation dip at a well site of claim 1, wherein: in the step 3), the original formation dip angle theta at the well point is an included angle between the construction surface at the well point and the current stratum surface.
5. The method of correcting a raw formation dip at a well site of claim 4, wherein: the calculation process of the included angle between the well point structural surface and the current stratum surface is as follows:
3.1) simplify the tectonic surface and the current formation surface at the well point into two planes:
3.2) solving normal vectors of the two planes;
and 3.3) solving the included angle of the normal vectors of the two planes, namely the original formation dip angle theta.
6. The method of correcting a raw formation dip at a well site of claim 5, wherein: in the step 3.1), the structural surface at the well point is simplified into a plane A, and the azimuth angle isThe angle of inclination is α1(ii) a Simplifying the current formation level at the well point to plane B, with an azimuth ofThe angle of inclination is α2：
The equation for plane A is:
<mrow> <mfrac> <mi>x</mi> <msub> <mi>a</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <mi>y</mi> <msub> <mi>b</mi> <mn>1</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <mi>z</mi> <msub> <mi>c</mi> <mn>1</mn> </msub> </mfrac> <mo>=</mo> <mn>1</mn> <mo>,</mo> </mrow>
the equation for plane B is:
<mrow> <mfrac> <mi>x</mi> <msub> <mi>a</mi> <mn>2</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <mi>y</mi> <msub> <mi>b</mi> <mn>2</mn> </msub> </mfrac> <mo>+</mo> <mfrac> <mi>z</mi> <msub> <mi>c</mi> <mn>2</mn> </msub> </mfrac> <mo>=</mo> <mn>1</mn> <mo>,</mo> </mrow>
wherein, a1、a2、b1、b2、c1、c2Are all constants.
7. The method of correcting a raw formation dip at a well site of claim 6, wherein: in the step 3.2), the normal vector of the plane AComprises the following steps:
wherein,
normal vector of plane BComprises the following steps:
wherein,
8. the method of correcting a raw formation dip at a well site of claim 7, wherein: in the step 3.3), the original formation dip angle θ is as follows:
<mrow> <mi>&theta;</mi> <mo>=</mo> <mi>a</mi> <mi>r</mi> <mi>c</mi> <mi>c</mi> <mi>o</mi> <mi>s</mi> <mfrac> <mrow> <mover> <mi>A</mi> <mo>&RightArrow;</mo> </mover> <mo>&CenterDot;</mo> <mover> <mi>B</mi> <mo>&RightArrow;</mo> </mover> </mrow> <mrow> <mrow> <mo>|</mo> <mover> <mi>A</mi> <mo>&RightArrow;</mo> </mover> <mo>|</mo> </mrow> <mrow> <mo>|</mo> <mover> <mi>B</mi> <mo>&RightArrow;</mo> </mover> <mo>|</mo> </mrow> </mrow> </mfrac> </mrow>
wherein,
9. the method of correcting a raw formation dip at a well site of claim 1, wherein: in the step 4), the conversion formula of the radian and the angle is as follows: the angle is radian x 180 °/pi.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109799547A (en) * | 2019-02-21 | 2019-05-24 | 华油阳光（北京）科技股份有限公司 | A kind of modeling method based on stratigraphic dip |
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| CN109799547A (en) * | 2019-02-21 | 2019-05-24 | 华油阳光（北京）科技股份有限公司 | A kind of modeling method based on stratigraphic dip |
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