CN111663932A - Method and apparatus for determining subsurface reservoir structure - Google Patents
Method and apparatus for determining subsurface reservoir structure Download PDFInfo
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Abstract
The application discloses a method and a device for determining a subsurface reservoir structure, and relates to the field of oil and gas exploration and development. The device can determine the inclination angle of the side lamination of the underground reservoir structure to be measured, can determine the position information of two target points of a highly-deviated well, can determine the horizontal distance of two adjacent target side laminations according to the position information and the inclination angle of the side lamination, can determine the transverse structure of the underground reservoir to be measured, and can determine the complete structure of the underground reservoir to be measured by combining the longitudinal structure of the underground reservoir to be measured.
Description
Technical Field
The application relates to the field of oil and gas exploration and development, in particular to a method and a device for determining a subsurface reservoir structure.
Background
The reservoir is a rock stratum which is provided with communicated pores and allows oil and gas to be stored and percolated in the reservoir, the underground reservoir structure can reflect the characteristics of the reservoir in underground constitution form, constitution scale, development direction, stacking relation among rock stratums and the like, the determination process of the underground reservoir structure is called description of the underground reservoir structure, and accurate geological foundation can be provided for three-dimensional geological modeling and residual oil research by determining the underground reservoir structure.
In the related art, the method for determining the structure of the underground reservoir comprises two methods, wherein the first method is a seismic sedimentology method which researches the distribution of the underground reservoir by using seismic imaging characteristics through stratigraphic slicing on three-dimensional seismic data; the second method is a multi-well mode prediction method, which can describe the distribution of the underground reservoir structure at a single well position by using the underground well information of a single well.
However, the existing method for determining the structure of the underground reservoir can only determine the longitudinal structure of the underground reservoir, so that the complete structure of the underground reservoir cannot be determined.
Disclosure of Invention
The invention provides a method and a device for determining a structure of an underground reservoir, which can solve the problem that the complete structure of the underground reservoir cannot be determined in the related art. The technical scheme is as follows:
in one aspect, a method of determining a subsurface reservoir structure is provided, the subsurface reservoir structure comprising: a side build-up layer, the method comprising:
determining a side deposit inclination angle of an underground reservoir structure to be measured, wherein the underground reservoir structure to be measured has a plurality of target side deposits, and each target side deposit has the side deposit inclination angle;
determining position information of two target points of a highly deviated well, wherein the highly deviated well penetrates through two adjacent target side buildup layers of the underground reservoir to be measured, and the two target points are intersection points of the highly deviated well and the two adjacent target side buildup layers;
and determining the horizontal distance of the two adjacent target side laminated layers according to the position information of the two target points of the highly-deviated well and the inclination angle of the side laminated layer.
Optionally, the two target points of the highly deviated well include a target point C and a target point D, and the position information of the two target points includes: coordinate values (x3, y3) of the target point C in a first plane rectangular coordinate system, coordinate values (x4, y4) of the target point D in the first plane rectangular coordinate system, the plane of the first plane rectangular coordinate system is vertical to the horizontal plane,
determining the horizontal distance of the two adjacent target side buildup layers according to the position information of the two target points of the highly deviated well and the inclination angle of the side buildup layer, wherein the determining comprises the following steps:
according to the position information of the two target points of the highly-deviated well and the inclination angle of the side deposit layer, calculating the horizontal distance d of the two adjacent target side deposit layers based on a distance calculation formula, wherein the distance calculation formula is as follows:
d＝|x3-x4|+|y3-y4|*tan(90°-α)；
wherein α is the side lay layer tilt angle.
Optionally, the two target points of the highly deviated well include a target point C and a target point D, and the position information of the two target points includes: coordinate values (x3, y3) of the target point C in a first planar rectangular coordinate system, coordinate values (x4, y4) of the target point D in the first planar rectangular coordinate system, the plane of the first planar rectangular coordinate system being parallel to the tilt direction of the target-side lamination layers,
the determining of the position information of the two target points of the highly deviated well comprises the following steps:
acquiring first logging information of the highly deviated well, wherein the first logging information records depth information of a stratum penetrated by the highly deviated well;
determining depth information of the target point C and depth information of the target point D in the first logging information, determining a vertical coordinate value y3 of the target point C in the first rectangular plane coordinate system based on the depth information of the target point C, and determining a vertical coordinate value y4 of the target point D in the first rectangular plane coordinate system based on the depth information of the target point D;
acquiring first drilling information of the highly deviated well, wherein the first drilling information records horizontal coordinate values corresponding to different vertical coordinate values of the highly deviated well in the first plane rectangular coordinate system;
inquiring the first drilling information based on a vertical coordinate value y3 of the target point C in the first plane rectangular coordinate system to obtain a horizontal coordinate value x3 of the target point C in the first plane rectangular coordinate system;
and inquiring the first drilling information based on the vertical coordinate value y4 of the target point D in the first plane rectangular coordinate system to obtain the horizontal coordinate value x4 of the target point D in the first plane rectangular coordinate system.
Optionally, the determining the dip angle of the lateral buildup layer of the subsurface reservoir structure to be measured includes:
determining two single wells that pass through any one target lateral pad of the subsurface reservoir structure to be measured;
determining the inclination angle of any one target side deposit layer based on the position information of each single well and the position information of the intersection of the single well and the any one target side deposit layer;
and determining the inclination angle of any one target side lamination as the inclination angle of the side lamination.
Optionally, the determining the inclination angle of any one target side deposit based on the position information of each single well and the position information of the intersection with any one target side deposit includes:
acquiring second logging information of each single well, wherein the second logging information of each single well records depth information of a stratum penetrated by the single well;
determining depth information at the intersection of the two single wells and the any one target side pad based on the second logging information of each single well;
determining a depth difference of the two single wells based on depth information at the intersection of the two single wells and the any one of the target lateral buildup layers;
acquiring second drilling information of each single well, wherein the second drilling information of each single well records the coordinates of the single well in a second plane rectangular coordinate system, and the plane of the second plane rectangular coordinate system is parallel to the horizontal plane;
determining the distance between the two single wells in the second plane rectangular coordinate system based on second drilling information of the two single wells;
and determining the inclination angle of the any target side packed layer based on the depth difference of the two single wells and the distance of the two single wells in the second plane rectangular coordinate system.
Optionally, the method further includes:
and establishing a structural model of the underground reservoir structure to be measured based on the horizontal distance between the two adjacent target side buildup layers.
In another aspect, there is provided an apparatus for determining a subsurface reservoir structure, the subsurface reservoir structure comprising: a side lay-up layer, the apparatus comprising:
the device comprises a first determination module, a second determination module and a third determination module, wherein the first determination module is used for determining the inclination angle of a side layer of a subsurface reservoir structure to be measured, the subsurface reservoir structure to be measured has a plurality of target side layers, and each target side layer has the inclination angle of the side layer;
the second determining module is used for determining position information of two target points of a highly deviated well, the highly deviated well penetrates through two adjacent target side buildup layers of the underground reservoir to be measured, and the two target points are intersection points of the highly deviated well and the two adjacent target side buildup layers;
and the third determining module is used for determining the horizontal distance of the two adjacent target side laminated layers according to the position information of the two target points of the highly-deviated well and the inclination angle of the side laminated layer.
Optionally, the two target points of the highly deviated well include a target point C and a target point D, and the position information of the two target points includes: coordinate values (x3, y3) of the target point C in a first plane rectangular coordinate system, coordinate values (x4, y4) of the target point D in the first plane rectangular coordinate system, the plane of the first plane rectangular coordinate system is vertical to the horizontal plane,
the third determining module is configured to:
according to the position information of the two target points of the highly-deviated well and the inclination angle of the side deposit layer, calculating the horizontal distance d of the two adjacent target side deposit layers based on a distance calculation formula, wherein the distance calculation formula is as follows:
d＝|x3-x4|+|y3-y4|*tan(90°-α)；
wherein α is the side lay layer tilt angle.
Optionally, the two target points of the highly deviated well include a target point C and a target point D, and the position information of the two target points includes: coordinate values (x3, y3) of the target point C in a first planar rectangular coordinate system, coordinate values (x4, y4) of the target point D in the first planar rectangular coordinate system, the plane of the first planar rectangular coordinate system being parallel to the tilt direction of the target-side lamination layers,
the second determining module includes:
the first obtaining sub-module is used for obtaining first logging information of the highly deviated well, and the first logging information records depth information of a stratum penetrated by the highly deviated well;
a first determining sub-module, configured to determine depth information of the target point C and depth information of the target point D in the first logging information, determine a vertical coordinate value y3 of the target point C in the first rectangular plane coordinate system based on the depth information of the target point C, and determine a vertical coordinate value y4 of the target point D in the first rectangular plane coordinate system based on the depth information of the target point D;
the second obtaining sub-module is used for obtaining first drilling information of the highly deviated well, and the first drilling information records horizontal coordinate values corresponding to different vertical coordinate values of the highly deviated well in the first plane rectangular coordinate system;
and the second determining submodule is used for inquiring the first drilling information based on the vertical coordinate value y3 of the target point C in the first planar rectangular coordinate system to obtain the horizontal coordinate value x3 of the target point C in the first planar rectangular coordinate system, and inquiring the first drilling information based on the vertical coordinate value y4 of the target point D in the first planar rectangular coordinate system to obtain the horizontal coordinate value x4 of the target point D in the first planar rectangular coordinate system.
Optionally, the first determining module includes:
a third determining submodule for determining two single wells which pass through any one target side deposit of the underground reservoir structure to be measured;
a fourth determining submodule, configured to determine an inclination angle of any one of the target side buildup layers based on the position information of each of the single wells and the position information of the intersection with the any one of the target side buildup layers;
and the fifth determining submodule is used for determining the inclination angle of any one target side lamination layer as the inclination angle of the side lamination layer.
Optionally, the fourth determining sub-module includes:
the first acquisition unit is used for acquiring second logging information of each single well, and the second logging information of each single well records depth information of a stratum penetrated by the single well;
a first determining unit, configured to determine depth information of an intersection of the two single wells and the any one of the target side buildup layers based on the second logging information of each of the single wells;
a second determining unit, configured to determine a depth difference between the two single wells based on depth information at an intersection of the two single wells and the any one of the target side buildup layers;
the second acquisition unit is used for acquiring second drilling information of each single well, the second drilling information of each single well records the coordinates of the single well in a second plane rectangular coordinate system, and the plane where the second plane rectangular coordinate system is located is parallel to the horizontal plane;
a third determining unit, configured to determine, based on second drilling information of the two single wells, a distance between the two single wells in the second planar orthogonal coordinate system;
and the fourth determining unit is used for determining the inclination angle of the any target side packed layer based on the depth difference of the two single wells and the distance of the two single wells in the second plane rectangular coordinate system.
Optionally, the apparatus further comprises:
and the establishing module is used for establishing a structural model of the underground reservoir structure to be measured based on the horizontal distance between the two adjacent target side buildup layers.
In yet another aspect, an apparatus for determining a subsurface reservoir structure is provided, the apparatus 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 subsurface reservoir structure as described in the above aspect.
In a further aspect, there is provided a computer readable storage medium having instructions stored therein which, when run on a computer, cause the computer to perform a method of determining a subsurface reservoir structure as described in the above aspect.
The technical scheme that this application provided brings beneficial effect and includes at least:
the device can determine the inclination angle of the side lamination of the underground reservoir structure to be measured, can determine the position information of two target points of a highly deviated well, and can determine the horizontal distance of two adjacent target side laminations according to the position information and the inclination angle of the side lamination, thereby determining the transverse structure of the underground reservoir to be measured, and then can determine the complete structure of the underground reservoir to be measured by combining the longitudinal structure of the underground reservoir to be measured.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic structural diagram of a point dam provided in an embodiment of the present invention;
FIG. 2 is a flow chart of a method for determining subsurface reservoir structure provided by an embodiment of the invention;
FIG. 3 is a flow chart of another method of determining subsurface reservoir structure provided by an embodiment of the present invention;
FIG. 4 is a plan view of a single well distribution in an area of a subsurface reservoir structure to be measured according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a single well distribution at an area of a subsurface reservoir structure to be measured according to an embodiment of the present invention;
FIG. 6 is a flowchart of a method for determining an angle of inclination of any one of the target side buildup layers according to an embodiment of the present invention;
FIG. 7 is a schematic illustration of a single well log provided by an embodiment of the present invention;
FIG. 8 is a schematic diagram of the positions of two single wells in a first planar rectangular coordinate system according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of the positions of two single wells in a second planar rectangular coordinate system according to an embodiment of the present invention;
FIG. 10 is a flowchart of a method for determining location information of two target points according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of first log information for a highly deviated well according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of a position of a target point in a first planar rectangular coordinate system according to an embodiment of the present invention;
FIG. 13 is a cross-sectional view of a construction model provided in accordance with an embodiment of the present invention;
FIG. 14 is a top view of a construction model provided in accordance with an embodiment of the present invention;
fig. 15 is a schematic structural diagram of an apparatus for determining a subsurface reservoir structure according to an embodiment of the present invention;
FIG. 16 is a block diagram of a second determining module according to an embodiment of the present invention;
FIG. 17 is a block diagram of a first determining module according to an embodiment of the present invention;
FIG. 18 is a block diagram of a fourth determination sub-module according to an embodiment of the present invention;
fig. 19 is a schematic structural diagram of another device for determining the structure of a subsurface reservoir according to an embodiment of the present invention.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The deposition pattern may be used to interpret the deposition environment and the deposition artifacts formed in the deposition environment. Meandering and braided rivers are common sedimentary environments in geological structures. The meandering stream may be a river channel distributed in a strip shape on a plane, and at a curved channel of the meandering stream, as the water flow makes a spiral motion, a concave bank of the curved channel is eroded by the water flow, and eroded substances are accumulated to a convex bank to form a beach, also called a point dam. The braided river is a river channel with a river bed of branched type, the width of the river channel is the same, and the river channel is similar to a braided river. At the bends of a braided river, the cardiac flat is also formed by the same water flow conditions. The cardiac beach is connected with the bank through siltation, and can become a side beach, and the side beach is cut by rivers, can form the cardiac beach.
Fig. 1 is a schematic structural diagram of a point dam according to an embodiment of the present invention. As shown in fig. 1, the internal structure of the point dam 1 generally includes a side buildup layer 10 and a mudstone sandwich layer 11 (also called a side buildup) between the side buildup layer 10. The lateral body is made of sandstone capable of storing oil and gas, and is an important reservoir in a meandering river and a braided river. In the field of oil exploitation, the underground reservoir structure of a point dam is researched, and an accurate geological foundation can be provided for three-dimensional geological modeling and residual oil research.
In the related art, seismic sedimentology methods or multi-well pattern prediction methods may be used to determine the distribution of subsurface reservoir structures. However, the existing method for determining the structure of the underground reservoir can only determine the longitudinal structure of the underground reservoir and cannot determine the transverse structure of the underground reservoir, so that the complete structure of the underground reservoir cannot be determined. The horizontal structure can reflect the horizontal distribution condition of the underground reservoir, and the horizontal distance between any two adjacent side buildup layers can reflect the horizontal structure.
The embodiment of the invention provides a method for determining the structure of a subsurface reservoir, which can be used for determining the complete structure of the subsurface reservoir. As shown in fig. 2, the method may include:
In an embodiment of the invention, the subsurface reservoir structure to be measured, such as a point dam, may include a plurality of target side buildup layers, each target side buildup layer having a side buildup layer dip angle. In general, the plurality of target-side buildup layers are arranged in parallel, so that the side buildup layers of the plurality of target-side buildup layers have equal angles of inclination. Wherein, the inclination angle of the side lamination refers to the included angle between any target side lamination and the horizontal plane.
And step 202, determining the position information of two target points of the highly deviated well.
The highly deviated well penetrates through two adjacent target side lamination layers of the underground reservoir structure to be measured, and the two target points can be intersection points of the highly deviated well and the two adjacent target side lamination layers.
Wherein the highly deviated well may refer to a well having a deviation in the range of 60 ° (degrees) to 85 °.
And step 203, determining the horizontal distance of two adjacent target side buildup layers according to the position information of two target points of the highly-deviated well and the inclination angle of the side buildup layer.
Wherein the extension direction of the horizontal distance may be parallel to the horizontal plane.
In summary, the embodiment of the present invention provides a method for determining a subsurface reservoir structure, which can determine a lateral buildup inclination angle of a subsurface reservoir structure to be measured, determine position information of two target points of a highly-deviated well, determine a horizontal distance between two adjacent target lateral buildup layers according to the position information and the lateral buildup inclination angle, thereby determining a lateral structure of the subsurface reservoir to be measured, and determine a complete structure of the subsurface reservoir to be measured by combining a longitudinal structure of the subsurface reservoir to be measured.
In the embodiment of the invention, the position information of two single wells penetrating through the same target side deposit in the underground reservoir structure to be measured and the position information of the intersection of the single wells and the target side deposit can be determined, so that the inclination angle of the side deposit of the underground reservoir structure to be measured is determined, the position information of two target points of a highly-deviated well is determined, and finally the complete structure of the underground reservoir to be measured is determined according to the inclination angle of the side deposit and the position information of the two target points. The position information of the two target points of each single well and the highly deviated well can be determined by drilling information (for example, first drilling information and second drilling information described later) and logging information (for example, first logging information and second logging information described later). The drilling information may be obtained during logging while drilling, which may include logging while drilling data. The logging information may be obtained during logging after completion of drilling, and may include: natural gamma curves, sonic curves, resistivity curves, formation resistivity curves or deep induced resistivity curves, etc.
In practice, in order to determine the position information of each individual well, the position information of the intersection of each individual well and any one of the target side buildup layers, and the position information of two target points of a highly deviated well, a planar rectangular coordinate system, such as a first planar rectangular coordinate system and a second planar rectangular coordinate system, which will be described later, may be established. By determining the coordinates of each single well in the rectangular plane coordinate system, the position information of each single well and the position information of the intersection of each single well and any target side lamination can be accurately determined. The position information of the two target points can be accurately determined by determining the coordinates of the two target points in the rectangular plane coordinate system. The first plane rectangular coordinate system is vertical to the horizontal plane and parallel to the inclination directions of the target side lamination layers, and the second plane rectangular coordinate system is vertical to the first plane rectangular coordinate system.
Based on this, referring to fig. 3, fig. 3 is a flow chart of another method for determining a subsurface reservoir structure according to an embodiment of the present invention. The method can comprise the following steps:
In an embodiment of the present invention, a plurality of single wells may be disposed in the area of the subsurface reservoir structure to be measured. The two single wells (also called twin wells) may be selected from the plurality of single wells, or may be two single wells that are predetermined. The determining mode of the two single wells is not limited, and only the two single wells are ensured to pass through the same target side lamination layer.
For example, referring to fig. 4 and 5, fig. 4 is a top view of a single well distribution at a region where a subsurface reservoir structure to be measured is located according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of a single well distribution at an area of a subsurface reservoir structure to be measured according to an embodiment of the present invention. As can be seen from fig. 4 and 5, a highly deviated well and a plurality of single wells may be provided in the area of the subsurface reservoir structure to be measured, and 1 highly deviated well l and 3 single wells m, n and o are shown in fig. 4 and 5. Wherein each single well can be a vertical well, and the well inclination of the vertical well is about 0 degrees. As can be seen in FIG. 5, single well m and single well n pass through the same target side pad, and single well n and single well o pass through the same target side pad. The single well m and the single well n can thus be identified as the two single wells described above.
And 302, determining the inclination angle of any target side packed layer based on the position information of each single well and the position information of the intersection of the target side packed layer and the target side packed layer.
The inclination angle of the target side lamination may refer to an angle between the target side lamination and a horizontal plane. The location information for each individual well may include coordinates of each individual well in a second planar orthogonal coordinate system. The location information of the intersection of each individual well with the same target-side pad may include coordinates of the intersection in a first planar orthogonal coordinate system.
As shown in fig. 6, fig. 6 is a flowchart of a method for determining an inclination angle of any one target-side buildup layer according to an embodiment of the present invention, where the process for determining the inclination angle of any one target-side buildup layer may include:
and step 3021, acquiring second logging information of each single well.
And the second logging information of each single well records the depth information of the stratum penetrated by the single well, wherein the depth direction is parallel to the gravity direction.
And step 3022, determining depth information of the intersection of the two single wells and any target side deposit layer based on the second logging information of each single well.
In an embodiment of the present invention, the second logging information may be obtained in a logging process, the second logging information includes a natural gamma curve of each individual well, the logging process may include a natural gamma logging process, in the natural gamma logging process, the natural gamma curve of each individual well may be obtained, and the depth information may be obtained according to the natural gamma curve.
Natural gamma logging refers to detecting the intensity of radioactive elements naturally present in an underground reservoir structure within a well. Since the same substance is contained in the same side lamination, for example, the substance can be mudstone or sandstone, the content of radioactive elements in the side lamination is the same, and the radiation intensity is also the same. When different single wells pass through the same side for lamination, the natural gamma curve fluctuation amplitude of each single well at the position of the side lamination is the same, so that whether the single well passes through the same side lamination can be judged according to the natural gamma curves of the different single wells, and the depth of the intersection of the single well and the different side laminations can be determined according to the natural gamma curve of each single well.
FIG. 7 is a schematic diagram of a single well log provided by an embodiment of the present invention. In figure 7 are shown 3 single wells m, n and o, and 4 side pad layers c1, c2, c3 and c 4. The individual well logs of a single well are explained using the well log of a single well m in fig. 7 as an example: AC represents a sonic curve recorded in units of microseconds per meter (μ s/m) with a fluctuation amplitude of 100 to 375 μ s/m, i.e., the peak of the sonic curve is 375 μ s/m and the valley is 100 μ s/m. GR represents the natural gamma curve, recorded in API, with a fluctuation range of 50 to 125 API. RILD represents a deep induction resistivity curve, which is reported in units of ohm-meters (Ω · m) with a fluctuation range of 2 to 12 Ω · m. SP represents a natural potential curve, which is recorded in millivolts (mv) with a fluctuation range of 20000 to 69050 mv.
As can be seen from FIG. 7, the presence of the same amplitude of fluctuation in the natural gamma curve for well m and the natural gamma curve for well n indicates that well m and well n have passed through the same side of the layer c 2. The natural gamma curve of the single well n and the natural gamma curve of the single well o have curve parts with the same fluctuation amplitude, which indicates that the single well n and the single well o pass through the same side lamination c 3.
The embodiment of the invention takes the single well m and the single well n which pass through the same side lamination layer c2 as an example to illustrate the process of determining the depth information of the intersection of the two single wells and the target side lamination layer c2 in a plane rectangular coordinate system. The process may include:
fig. 8 is a schematic diagram of positions of two single wells in a first planar orthogonal coordinate system according to an embodiment of the present invention. Referring to fig. 8, in the first planar orthogonal coordinate system, the coordinates of the intersection of the single well m and the target-side buildup layer c2 are (x1, y1), and the coordinates of the intersection of the single well n and the target-side buildup layer c2 are (x2, y 2). Then y1 is the depth of the intersection of the single well m and the target side pad and y2 is the depth of the intersection of the single well n and the same target side pad.
And step 3023, determining the depth difference of the two single wells based on the depth information of the intersection of the two single wells and any one target side deposit layer.
For example, if the depth of a single well m is y1 and the depth of a single well n is y2 as shown in fig. 8, the depth difference between the single well m and the single well n is y2-y 1.
And step 3024, acquiring second drilling information of each single well.
And the second well drilling information of each single well records the coordinates of the single well in a second plane rectangular coordinate system, wherein the plane of the second plane rectangular coordinate system is parallel to the horizontal plane.
Fig. 9 is a schematic diagram of positions of two single wells in a second planar orthogonal coordinate system according to an embodiment of the present invention. As can be seen from fig. 9, in the second planar orthogonal coordinate system, the coordinates of the single well m are (a1, b1), and the coordinates of the single well n are (a2, b 2).
And step 3025, determining the distance between the two single wells in the second plane rectangular coordinate system based on the second drilling information of the two single wells.
Wherein the distance may refer to a length of a line segment between the single well m and the single well n.
For example, in the second planar rectangular coordinate system shown in fig. 9, the coordinates of a single well m are (a1, b1), the coordinates of a single well n are (a2, b2), and the distance between the single well m and the single well n is then determined
And step 3026, determining the inclination angle of the layer on any target side based on the depth difference of the two single wells and the distance between the two single wells in the second plane rectangular coordinate system.
As shown in fig. 8, the coordinates of the intersection of the single well m and the target side deposit c2 are (x1, y1), the coordinates of the intersection of the single well n and the target side deposit c2 are (x2, y2), and the inclination angle α is arctan ((y2-y1)/(x2-x 1)). wherein (y2-y1) is the depth difference between the single well m and the single well n, (x2-x1) is the distance between the single well m and the single well n in the second planar rectangular coordinate system, and the distance between the single well m and the single well n in the second planar rectangular coordinate system is the distance between the single well m and the single well n in the second planar rectangular coordinate system
Thus, the angle of inclination
In the embodiment of the invention, because the target side buildup layers in the underground reservoir structure to be measured are arranged in parallel, the inclination angle of any target side buildup layer can be determined as the inclination angle of the side buildup layer.
The above steps 301 and 302 are an exemplary implementation manner of determining a side layer inclination angle of the subsurface reservoir structure to be measured, and the side layer inclination angle may also be determined by other manners, for example, the side layer inclination angle may be determined in a pre-established stereo coordinate system or the side layer inclination angle of the subsurface reservoir structure to be measured formed in the same manner as the subsurface reservoir structure to be measured or the empirically determined side layer inclination angle may be determined as the side layer inclination angle of the subsurface reservoir structure to be measured. The embodiment of the present invention is not limited thereto.
And step 304, determining the position information of two target points of the highly-deviated well.
The highly deviated well penetrates through two adjacent target side lamination layers c1 and c2 of the underground reservoir structure to be measured, and two target points are intersection points of the highly deviated well and the two adjacent target side lamination layers c1 and c 2.
In an embodiment of the present invention, the two target points of the highly deviated well include a target point C and a target point D, and the position information of the two target points includes: the coordinate values of the target point C in the first plane rectangular coordinate system (x3, y3) and the coordinate values of the target point D in the first plane rectangular coordinate system (x4, y 4).
As shown in fig. 10, fig. 10 is a flowchart of a method for determining location information of two target points according to an embodiment of the present invention, where the process for determining location information of two target points of a highly deviated well may include:
Wherein the first logging information may include a natural gamma curve recording depth information of a lateral pad traversed by a highly deviated well. The depth information may refer to an altitude of the side pad.
In embodiments of the invention, the highly deviated well may be sequentially passed through a lateral pad and a lateral volume in the subsurface reservoir structure to be measured. Since the side lamination is generally mudstone, the radioactive intensity of radioactive elements in the mudstone is high, the side lamination sandwiched between the two side laminations is generally sandstone, and the radioactive intensity of radioactive elements in the sandstone is low, in the natural gamma curve of the highly deviated well, the fluctuation amplitude of the part of the natural gamma curve at the side lamination and the part of the natural gamma curve at the side lamination are different, and the fluctuation amplitude at the side lamination is larger than that at the side lamination. Whether the reservoir penetrated by the highly deviated well is a side deposit or not can be determined according to the natural gamma curve in the first logging information, and the depth of the side deposit penetrated by the highly deviated well can be determined. Wherein the depth is the elevation of the layer top at the intersection of the highly deviated well and the side layer.
FIG. 11 is a schematic diagram of first log information for a highly deviated well according to an embodiment of the present invention. Curves shown in fig. 11: AC. For the meaning of GR, RILD, and SP, reference may be made to the meaning of AC, GR, RILD, and SP in fig. 7, which is not described in detail in the embodiments of the present invention. As can be seen from fig. 11, when the highly deviated well passes through a side deposit, the fluctuation amplitude of the portion of the natural gamma curve of the highly deviated well corresponding to the side deposit is large. When the highly-inclined well passes through the lateral body, the fluctuation amplitude of the partial curve corresponding to the lateral body in the natural gamma curve of the highly-inclined well is smaller.
The vertical coordinate value y3 of the target point C in the first rectangular planar coordinate system is the depth of the target point C, and the vertical coordinate value y4 of the target point D in the first rectangular planar coordinate system is the depth of the target point D.
The first drilling information records horizontal coordinate values corresponding to different vertical coordinate values of the highly-deviated well in the first plane rectangular coordinate system. That is, the first drilling information records the corresponding relationship between different vertical coordinate values and horizontal coordinate values of the highly-deviated well in the first planar orthogonal coordinate system.
Fig. 12 is a schematic diagram of a position of a target point in a first planar rectangular coordinate system according to an embodiment of the present invention. Referring to fig. 12, the vertical coordinate value of the target point C is y3, and correspondingly, the horizontal coordinate value of the target point C is x 3.
Referring to fig. 12, the vertical coordinate value of the target point D is y4, and correspondingly, the horizontal coordinate value of the target point D is x 4.
And 305, determining the horizontal distance d of two adjacent target side buildup layers based on a distance calculation formula according to the position information and the side buildup layer inclination angle of two target points of the highly-deviated well.
Wherein, the distance calculation formula is as follows: d | | x3-x4| + | | y3-y4| + | tan (90 ° - α), α is the side layer tilt angle.
And step 306, establishing a structural model of the underground reservoir structure to be measured based on the horizontal distance d between two adjacent target side lamination layers.
According to the method, the horizontal distance between every two adjacent target side buildup layers can be calculated, so that the horizontal distance between all adjacent side buildup layers of the underground reservoir structure to be measured can be obtained, and then the structural model of the underground reservoir structure to be measured can be accurately established according to the longitudinal structure of the underground reservoir structure to be measured, as shown in fig. 13 and 14, fig. 13 is a sectional view of the structural model provided by the embodiment of the invention, and fig. 14 is a top view of the structural model provided by the embodiment of the invention. The structural model may reflect the complete structure of the subsurface reservoir to be measured. In which one highly deviated well l and 4 single wells m, n, o and p are shown in figures 13 and 14. The log curves for each well are explained using the single well m in FIG. 13 as an example: RT represents the formation resistivity curve, which is reported in units of ohm-meters (Ω · m) with a fluctuation range of 1 to 40 Ω · m. For the meaning of the remaining curves GR, SP, and AC of the single well m, reference may be made to the meaning of GR, SP, and AC in fig. 7, which is not described herein in detail in this embodiment of the present invention.
In the embodiment of the present invention, the process of establishing the structural model of the subsurface reservoir structure to be measured may be as follows:
firstly, determining a curve part with larger fluctuation amplitude of a natural gamma value according to a natural gamma curve of a highly-deviated well, then determining the highly-deviated well on a section plane of the highly-deviated well according to a well track and a well inclination angle of the highly-deviated well, and calibrating the real vertical depth of the highly-deviated well on the section plane. And further, identifying the single-well argillaceous side deposits according to natural gamma curves of a plurality of single wells, determining adjacent side deposits in the underground reservoir structure to be measured, and finally performing mode fitting according to the curve part with large fluctuation amplitude, the inclination angle of the side deposits and the horizontal distance between the adjacent side deposits to obtain the structural model. Wherein, the part of the curve with larger fluctuation amplitude in the natural gamma curve corresponds to the side lamination penetrated by the highly-deviated well.
Optionally, the horizontal width of the lateral buildup layer and the horizontal width of the lateral buildup body in the subsurface reservoir structure to be measured can also be obtained from the sectional view of the structural model. Wherein the extending direction of the horizontal width is parallel to the horizontal plane.
By way of example, as can be seen in this fig. 13, the horizontal width of the side deposits in the subsurface reservoir structure to be measured is from 6 meters (m) to 12m, and the horizontal width of the side deposits sandwiched between the two side deposits is from 6m to 23 m.
In summary, the embodiment of the present invention provides a method for determining a subsurface reservoir structure, which can determine a lateral buildup inclination angle of a subsurface reservoir structure to be measured, determine position information of two target points of the highly-deviated well, and determine a horizontal distance between two adjacent target lateral buildup layers according to the position information and the lateral buildup inclination angle. The method can accurately determine the horizontal distance between every two adjacent target side lamination layers in the underground reservoir structure to be measured, and then combines the longitudinal structure of the underground reservoir structure to be measured, so that the underground reservoir structure to be measured can be accurately determined, and a foundation can be laid for the prediction of sand body change and the description of residual oil distribution in the oil reservoir of the old oil field.
The embodiment of the invention provides a device for determining a subsurface reservoir structure, which comprises: and (4) side lamination. As shown in fig. 15, fig. 15 is a schematic structural diagram of an apparatus for determining a subsurface reservoir structure according to an embodiment of the present invention, where the apparatus may include:
the first determining module 401 is configured to determine a side-pack inclination angle of the subsurface reservoir structure to be measured, where a plurality of target side packs exist in the subsurface reservoir structure to be measured, and each target side pack has the side-pack inclination angle.
The second determining module 402 is configured to determine position information of two target points of the highly deviated well, where the highly deviated well passes through two adjacent target side buildup layers of the underground reservoir to be measured, and the two target points are intersection points of the highly deviated well and the two adjacent target side buildup layers.
And a third determining module 403, configured to determine horizontal distances of two adjacent target side buildup layers according to the position information of the two target points of the highly deviated well and the side buildup layer inclination angle.
In summary, the embodiments of the present invention provide an apparatus for determining a subsurface reservoir structure, which may determine an inclination angle of a side deposit of a subsurface reservoir structure to be measured, determine position information of two target points of a highly-deviated well, and then determine a horizontal distance between two adjacent target side deposits according to the position information and the inclination angle of the side deposit, so as to determine a lateral structure of the subsurface reservoir to be measured, and determine a complete structure of the subsurface reservoir to be measured by combining a longitudinal structure of the subsurface reservoir to be measured.
Optionally, the two target points of the highly deviated well include a target point C and a target point D, and the position information of the two target points includes: coordinate values (x3, y3) of the target point C in a first plane rectangular coordinate system, coordinate values (x4, y4) of the target point D in a first plane rectangular coordinate system, the plane of the first plane rectangular coordinate system is vertical to the horizontal plane,
the third determining module 403 may be configured to:
according to the position information and the side laminated layer inclination angle of two target points of the highly deviated well, the horizontal distance d of two adjacent target side laminated layers is calculated based on a distance calculation formula, wherein the distance calculation formula is as follows:
d＝|x3-x4|+|y3-y4|*tan(90°-α)；
wherein α is the side layer inclination angle.
Optionally, the two target points of the highly deviated well include a target point C and a target point D, and the position information of the two target points includes: the coordinate values (x3, y3) of the target point C in the first rectangular plane coordinate system, and the coordinate values (x4, y4) of the target point D in the first rectangular plane coordinate system are parallel to the inclination direction of the target side lamination layers. Fig. 16 is a schematic structural diagram of a second determining module according to an embodiment of the present invention. Referring to fig. 16, the second determining module 402 may include:
the first obtaining sub-module 4021 is configured to obtain first logging information of the highly deviated well, where the first logging information records depth information of a formation through which the highly deviated well passes.
The first determining sub-module 4022 is configured to determine depth information of the target point C and depth information of the target point D in the first logging information, determine a vertical coordinate value y3 of the target point C in the first rectangular plane coordinate system based on the depth information of the target point C, and determine a vertical coordinate value y4 of the target point D in the first rectangular plane coordinate system based on the depth information of the target point D.
The second obtaining sub-module 4023 is configured to obtain first drilling information of the highly deviated well, where the first drilling information records horizontal coordinates corresponding to different vertical coordinates of the highly deviated well in the first planar rectangular coordinate system.
The second determining submodule 4024 is configured to query the first drilling information based on a vertical coordinate value y3 of the target point C in the first planar rectangular coordinate system, to obtain a horizontal coordinate value x3 of the target point C in the first planar rectangular coordinate system, and to query the first drilling information based on a vertical coordinate value y4 of the target point D in the first planar rectangular coordinate system, to obtain a horizontal coordinate value x4 of the target point D in the first planar rectangular coordinate system.
Fig. 17 is a schematic structural diagram of a first determining module according to an embodiment of the present invention. As shown in fig. 17, the first determining module 401 may include:
a third determination sub-module 4011 for determining two single wells traversing any target lateral pad of the subsurface reservoir structure to be measured.
A fourth determining submodule 4012, configured to determine a tilt angle of any one of the target-side buildup layers based on the position information of each individual well and the position information of the intersection with any one of the target-side buildup layers.
A fifth determining submodule 4013 configured to determine an inclination angle of any one of the target side buildup layers as a side buildup layer inclination angle.
Optionally, referring to fig. 18, fig. 18 is a schematic structural diagram of a fourth determination submodule provided in the embodiment of the present invention. The fourth determining sub-module 4012 may include:
the first obtaining unit 40121 is configured to obtain second logging information of each individual well, where the second logging information of each individual well records depth information of a formation penetrated by the individual well.
A first determining unit 40122 for determining depth information of the intersection of two single wells with any of the target lateral buildup layers based on the second logging information of each single well.
A second determining unit 40123 for determining a depth difference of two single wells based on depth information of the intersection of the two single wells with either of the target side buildup layers.
The second obtaining unit 40124 is configured to obtain second drilling information of each single well, where the second drilling information of each single well records coordinates of the single well in a second planar rectangular coordinate system, and a plane where the second planar rectangular coordinate system is located is parallel to a horizontal plane;
the third determining unit 40125 is configured to determine a distance between the two single wells in the second planar rectangular coordinate system based on the second drilling information of the two single wells;
and a fourth determination unit 40126, configured to determine the inclination angle of any one target-side buildup layer based on the depth difference between the two single wells and the distance between the two single wells in the second planar orthogonal coordinate system.
Optionally, referring to fig. 15, the apparatus may further include:
and the establishing module 404 is used for establishing a structural model of the underground reservoir structure to be measured based on the horizontal distance between two adjacent target side buildup layers.
In yet another aspect, an apparatus for determining a structure of a subterranean reservoir is provided, and referring to fig. 19, the apparatus may include: a processor 501, a memory 502 and a computer program 5021 stored on the memory 502 and operable on the processor 501, the processor 501 when executing the computer program 5021 may implement the method of determining a subsurface reservoir structure as provided in the above method embodiments.
In yet another aspect, a computer-readable storage medium having instructions stored therein, which when run on a computer, cause the computer to perform a method of determining a subsurface reservoir structure as provided in the above method embodiments is provided.
In summary, the embodiments of the present invention provide an apparatus for determining a subsurface reservoir structure, which may determine an inclination angle of a side deposit of a subsurface reservoir structure to be measured, determine position information of two target points of a highly-deviated well, and then determine a horizontal distance between two adjacent target side deposits according to the position information and the inclination angle of the side deposit, so as to determine a lateral structure of the subsurface reservoir to be measured, and determine a complete structure of the subsurface reservoir to be measured by combining a longitudinal structure of the subsurface reservoir to be measured.
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.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (11)
1. A method of determining a subsurface reservoir structure, the subsurface reservoir structure comprising: a side build-up layer, the method comprising:
determining a side deposit inclination angle of an underground reservoir structure to be measured, wherein the underground reservoir structure to be measured has a plurality of target side deposits, and each target side deposit has the side deposit inclination angle;
determining position information of two target points of a highly deviated well, wherein the highly deviated well penetrates through two adjacent target side buildup layers of the underground reservoir to be measured, and the two target points are intersection points of the highly deviated well and the two adjacent target side buildup layers;
and determining the horizontal distance of the two adjacent target side laminated layers according to the position information of the two target points of the highly-deviated well and the inclination angle of the side laminated layer.
2. The method of claim 1, wherein the two target points of the highly deviated well comprise a target point C and a target point D, and the location information of the two target points comprises: coordinate values (x3, y3) of the target point C in a first plane rectangular coordinate system, coordinate values (x4, y4) of the target point D in the first plane rectangular coordinate system, the plane of the first plane rectangular coordinate system is vertical to the horizontal plane,
determining the horizontal distance of the two adjacent target side buildup layers according to the position information of the two target points of the highly deviated well and the inclination angle of the side buildup layer, wherein the determining comprises the following steps:
according to the position information of the two target points of the highly-deviated well and the inclination angle of the side deposit layer, calculating the horizontal distance d of the two adjacent target side deposit layers based on a distance calculation formula, wherein the distance calculation formula is as follows:
d＝|x3-x4|+|y3-y4|*tan(90°-α)；
wherein α is the side lay layer tilt angle.
3. The method of claim 1, wherein the two target points of the highly deviated well comprise a target point C and a target point D, and the location information of the two target points comprises: coordinate values (x3, y3) of the target point C in a first planar rectangular coordinate system, coordinate values (x4, y4) of the target point D in the first planar rectangular coordinate system, the plane of the first planar rectangular coordinate system being parallel to the tilt direction of the target-side lamination layers,
the determining of the position information of the two target points of the highly deviated well comprises the following steps:
acquiring first logging information of the highly deviated well, wherein the first logging information records depth information of a stratum penetrated by the highly deviated well;
determining depth information of the target point C and depth information of the target point D in the first logging information, determining a vertical coordinate value y3 of the target point C in the first rectangular plane coordinate system based on the depth information of the target point C, and determining a vertical coordinate value y4 of the target point D in the first rectangular plane coordinate system based on the depth information of the target point D;
acquiring first drilling information of the highly deviated well, wherein the first drilling information records horizontal coordinate values corresponding to different vertical coordinate values of the highly deviated well in the first plane rectangular coordinate system;
inquiring the first drilling information based on a vertical coordinate value y3 of the target point C in the first plane rectangular coordinate system to obtain a horizontal coordinate value x3 of the target point C in the first plane rectangular coordinate system;
and inquiring the first drilling information based on the vertical coordinate value y4 of the target point D in the first plane rectangular coordinate system to obtain the horizontal coordinate value x4 of the target point D in the first plane rectangular coordinate system.
4. The method of any one of claims 1 to 3, wherein determining the dip angle of the lateral reservoir of the subsurface reservoir structure to be measured comprises:
determining two single wells that pass through any one target lateral pad of the subsurface reservoir structure to be measured;
determining the inclination angle of any one target side deposit layer based on the position information of each single well and the position information of the intersection of the single well and the any one target side deposit layer;
and determining the inclination angle of any one target side lamination as the inclination angle of the side lamination.
5. The method of claim 4,
determining the inclination angle of any one target side deposit based on the position information of each single well and the position information of the intersection of the single well and the any one target side deposit, wherein the determining comprises the following steps:
acquiring second logging information of each single well, wherein the second logging information of each single well records depth information of a stratum penetrated by the single well;
determining depth information at the intersection of the two single wells and the any one target side pad based on the second logging information of each single well;
determining a depth difference of the two single wells based on depth information at the intersection of the two single wells and the any one of the target lateral buildup layers;
acquiring second drilling information of each single well, wherein the second drilling information of each single well records the coordinates of the single well in a second plane rectangular coordinate system, and the plane of the second plane rectangular coordinate system is parallel to the horizontal plane;
determining the distance between the two single wells in the second plane rectangular coordinate system based on second drilling information of the two single wells;
and determining the inclination angle of the any target side packed layer based on the depth difference of the two single wells and the distance of the two single wells in the second plane rectangular coordinate system.
6. The method of claim 1, further comprising:
and establishing a structural model of the underground reservoir structure to be measured based on the horizontal distance between the two adjacent target side buildup layers.
7. An apparatus for determining a subsurface reservoir structure, the subsurface reservoir structure comprising: a side lay-up layer, the apparatus comprising:
the device comprises a first determination module, a second determination module and a third determination module, wherein the first determination module is used for determining the inclination angle of a side layer of a subsurface reservoir structure to be measured, the subsurface reservoir structure to be measured has a plurality of target side layers, and each target side layer has the inclination angle of the side layer;
the second determining module is used for determining position information of two target points of a highly deviated well, the highly deviated well penetrates through two adjacent target side buildup layers of the underground reservoir to be measured, and the two target points are intersection points of the highly deviated well and the two adjacent target side buildup layers;
and the third determining module is used for determining the horizontal distance of the two adjacent target side laminated layers according to the position information of the two target points of the highly-deviated well and the inclination angle of the side laminated layer.
8. The apparatus of claim 7, wherein the two target points of the highly deviated well comprise a target point C and a target point D, and the location information of the two target points comprises: coordinate values (x3, y3) of the target point C in a first plane rectangular coordinate system, coordinate values (x4, y4) of the target point D in the first plane rectangular coordinate system, the plane of the first plane rectangular coordinate system is vertical to the horizontal plane,
the third determining module is configured to:
according to the position information of the two target points of the highly-deviated well and the inclination angle of the side deposit layer, calculating the horizontal distance d of the two adjacent target side deposit layers based on a distance calculation formula, wherein the distance calculation formula is as follows:
d＝|x3-x4|+|y3-y4|*tan(90°-α)；
wherein α is the side lay layer tilt angle.
9. The apparatus of claim 7, wherein the two target points of the highly deviated well comprise a target point C and a target point D, and the location information of the two target points comprises: coordinate values (x3, y3) of the target point C in a first planar rectangular coordinate system, coordinate values (x4, y4) of the target point D in the first planar rectangular coordinate system, the plane of the first planar rectangular coordinate system being parallel to the tilt direction of the target-side lamination layers,
the second determining module includes:
the first obtaining sub-module is used for obtaining first logging information of the highly deviated well, and the first logging information records depth information of a stratum penetrated by the highly deviated well;
a first determining sub-module, configured to determine depth information of the target point C and depth information of the target point D in the first logging information, determine a vertical coordinate value y3 of the target point C in the first rectangular plane coordinate system based on the depth information of the target point C, and determine a vertical coordinate value y4 of the target point D in the first rectangular plane coordinate system based on the depth information of the target point D;
the second obtaining sub-module is used for obtaining first drilling information of the highly deviated well, and the first drilling information records horizontal coordinate values corresponding to different vertical coordinate values of the highly deviated well in the first plane rectangular coordinate system;
and the second determining submodule is used for inquiring the first drilling information based on the vertical coordinate value y3 of the target point C in the first planar rectangular coordinate system to obtain the horizontal coordinate value x3 of the target point C in the first planar rectangular coordinate system, and inquiring the first drilling information based on the vertical coordinate value y4 of the target point D in the first planar rectangular coordinate system to obtain the horizontal coordinate value x4 of the target point D in the first planar rectangular coordinate system.
10. The apparatus of any of claims 7 to 9, wherein the first determining module comprises:
a third determining submodule for determining two single wells which pass through any one target side deposit of the underground reservoir structure to be measured;
a fourth determining submodule, configured to determine an inclination angle of any one of the target side buildup layers based on the position information of each of the single wells and the position information of the intersection with the any one of the target side buildup layers;
and the fifth determining submodule is used for determining the inclination angle of any one target side lamination layer as the inclination angle of the side lamination layer.
11. An apparatus for determining a subsurface reservoir structure, the apparatus comprising: a processor, a memory, and a computer program stored on the memory and executable on the processor, the processor implementing the method of any of claims 1 to 6 when executing the computer program.
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