Oil-water interface depth determination method and system

Abstract

The present invention provides a method and system for determining the depth of an oil-water interface. The method for determining the depth of an oil-water interface comprises: obtaining multiple sets of data, each set of data including a formation depth and a pseudo-pressure gradient corresponding to the formation depth; generating multiple coordinate points according to the multiple sets of data; dividing the multiple coordinate points into oil coordinate points and water coordinate points; fitting multiple oil coordinate points to obtain an oil fitting curve; fitting multiple water coordinate points to obtain a water fitting curve; and taking the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve as the depth of the oil-water interface. The present invention can quickly, concisely and accurately obtain the oil-water interface, improve the accuracy of reservoir reserve evaluation, reduce exploration evaluation costs, and provide important support for the formulation of development plans.

Description

Technical Field

[0001] The present invention relates to the field of oil reservoirs, and in particular to a method and system for determining the depth of an oil-water interface. Background Art

[0002] Deep-sea oil reserves account for an increasingly higher proportion of global oil and gas exploration and discovery, especially in the past decade. Major global oil and gas discoveries have been concentrated in the Brazilian deep-sea oil and gas basin. After international oil prices bottomed out and rebounded in 2016, investment in oil and gas projects has been active and strong.

[0003] The currently commonly used oil testing technology, well logging interpretation technology, pressure testing technology and other indirect technologies have problems such as complex testing, long cycle, high cost, significant influence of external factors, and difficulty in identifying the intersection of the oil and water interface when identifying the oil-water interface. Summary of the invention

[0004] The main purpose of the embodiments of the present invention is to provide a method and system for determining the depth of the oil-water interface, so as to quickly, concisely and accurately obtain the oil-water interface, improve the accuracy of reservoir reserve evaluation, reduce exploration and evaluation costs, and provide important support for the formulation of development plans.

[0005] In order to achieve the above object, an embodiment of the present invention provides a method for determining the depth of an oil-water interface, comprising:

[0006] Acquire multiple sets of data, each set of data including a formation depth and a pseudo-pressure gradient corresponding to the formation depth;

[0007] Generate multiple coordinate points according to multiple sets of data;

[0008] Divide the plurality of coordinate points into oil coordinate points and water coordinate points;

[0009] Fitting multiple oil coordinate points to obtain an oil fitting curve; fitting multiple water coordinate points to obtain a water fitting curve;

[0010] The formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve is taken as the oil-water interface depth.

[0011] The embodiment of the present invention further provides a system for determining the depth of an oil-water interface, comprising:

[0012] An acquisition unit, used for acquiring multiple sets of data, each set of data including a formation depth and a pseudo-pressure gradient corresponding to the formation depth;

[0013] A coordinate point unit, used to generate multiple coordinate points according to multiple sets of data;

[0014] A division unit, used for dividing the plurality of coordinate points into oil coordinate points and water coordinate points;

[0015] A fitting unit is used to fit multiple oil coordinate points to obtain an oil fitting curve; and to fit multiple water coordinate points to obtain a water fitting curve;

[0016] The oil-water interface depth unit is used to take the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve as the oil-water interface depth.

[0017] An embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the monitoring event processing method when executing the computer program.

[0018] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the monitoring event processing method are implemented.

[0019] The oil-water interface depth determination method and system of the embodiment of the present invention first obtains multiple sets of data, each set of data includes a formation depth and a pseudo-pressure gradient corresponding to the formation depth, then generates multiple coordinate points based on the multiple sets of data, and divides the multiple coordinate points into oil coordinate points and water coordinate points; then fits the multiple oil coordinate points and the multiple water coordinate points to obtain an oil fitting curve and a water fitting curve, respectively, and finally uses the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve as the oil-water interface depth, so as to quickly, concisely and accurately obtain the oil-water interface, improve the accuracy of reservoir reserve evaluation, reduce exploration and evaluation costs, and provide important support for the formulation of development plans. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a flow chart of a method for determining the depth of an oil-water interface in an embodiment of the present invention;

[0022] Figure 2 is a flow chart of S103 in an embodiment of the present invention;

[0023] Figure 3 is a well logging data table in an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of a curve of formation depth and pseudo-pressure gradient in an embodiment of the present invention;

[0025] Figure 5 It is a curve diagram of formation depth and formation pressure in the prior art;

[0026] Figure 6 4 is a structural block diagram of the oil-water interface depth determination system in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Those skilled in the art will appreciate that the embodiments of the present invention may be implemented as a system, device, apparatus, method or computer program product. Therefore, the present disclosure may be implemented in the following forms, namely: complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0029] In view of the problems that the existing technology has in identifying the oil-water interface, such as complex testing, long cycle, high cost, large influence of external factors, and difficulty in identifying the intersection of the oil-water interface, the embodiment of the present invention provides a method for determining the depth of the oil-water interface, so as to obtain the oil-water interface quickly, concisely and accurately, improve the accuracy of reservoir reserve evaluation, reduce the cost of exploration and evaluation, and provide important support for the formulation of development plans. The present invention is described in detail below in conjunction with the accompanying drawings.

[0030] The technical principle of the present invention is: the strata and seawater layers above each pressure measuring point are collectively referred to as physical strata, and it is assumed that the pressure value of the oil reservoir and water reservoir at each pressure measuring point in the target layer is equivalent to the formation pressure value generated by the physical strata (strata and seawater layers) above the point, and at the same time the physical strata are homogenized, that is, the density of the physical strata is uniform, and the formation pressure at the pressure measuring point is a linear relationship between the homogenized density and depth.

[0031] Figure 1 : is a flow chart of the method for determining the depth of the oil-water interface in an embodiment of the present invention. Figure 1 As shown, the method for determining the depth of the oil-water interface includes:

[0032] S101: Acquire multiple sets of data, each set of data including a formation depth and a pseudo-pressure gradient corresponding to the formation depth.

[0033] S102: Generate multiple coordinate points according to multiple sets of data.

[0034] S103: Divide the plurality of coordinate points into oil coordinate points and water coordinate points.

[0035] S104: Fitting multiple oil coordinate points to obtain an oil fitting curve; fitting multiple water coordinate points to obtain a water fitting curve.

[0036] In specific implementation, multiple oil coordinate points can be fitted by the least square method to obtain an oil fitting curve; multiple water coordinate points can be fitted by the least square method to obtain a water fitting curve.

[0037] S105: The formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve is taken as the oil-water interface depth.

[0038] Figure 1 The execution subject of the method for determining the oil-water interface depth shown in the figure may be a computer. Figure 1 As can be seen from the process shown, the method for determining the oil-water interface depth in the embodiment of the present invention first obtains multiple sets of data, each set of data includes a formation depth and a pseudo-pressure gradient corresponding to the formation depth, and then generates multiple coordinate points based on the multiple sets of data, and divides the multiple coordinate points into oil coordinate points and water coordinate points; then fits the multiple oil coordinate points and the multiple water coordinate points to obtain an oil fitting curve and a water fitting curve, respectively, and finally uses the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve as the oil-water interface depth, so as to quickly, concisely and accurately obtain the oil-water interface, improve the accuracy of reservoir reserve evaluation, reduce exploration and evaluation costs, and provide important support for the formulation of development plans.

[0039] According to the principle of physical formation homogenization, all pressure measurement point data are converted into the product of the depth and density corresponding to each point. According to the principle of maximum difference in oil and water density, and due to the difference in long-term sorting and gas content of oil, the density varies greatly with depth, while the density of water varies less with depth. According to these physical characteristics of oil and water, the deep pressure domain value transformation can be performed, namely:

[0040] Before executing S101, the method may further include: obtaining a plurality of formation pressures, each formation pressure corresponding to each formation depth; and calculating each pseudo-pressure gradient corresponding to the formation depth according to each formation pressure corresponding to the formation depth and each formation depth.

[0041] For example, the formation pressure at the i-th pressure measuring point is: P i =ρ i ×g×H i ;

[0042] Among them, P i is the formation pressure at the i-th pressure measuring point, ρ i is the density of the ith pressure measuring point after homogenization, g is the acceleration of gravity, H i is the depth of the ith pressure measuring point (formation depth, from the pressure measuring point to the sea level).

[0043] Pseudo-pressure gradient at the i-th pressure measuring point:

[0044] Among them, P i 拟 is the pseudo-pressure gradient at the i-th pressure measuring point.

[0045] Figure 2 is a flow chart of S103 in an embodiment of the present invention. Figure 2 As shown, S103 includes:

[0046] S201: Calculate the slope of a straight line connecting any two adjacent coordinate points; wherein the two adjacent coordinate points are a first coordinate point and a second coordinate point, and the abscissa of the first coordinate point is smaller than the abscissa of the second coordinate point.

[0047] S202: Sort the multiple slopes in ascending order according to the size of the horizontal coordinate of the first coordinate point corresponding to each slope.

[0048] S203: Divide the former slope of two adjacent slopes by the latter slope, and when the divisor is greater than a threshold, take the first coordinate point corresponding to the latter slope as an inflection point.

[0049] S204: When the horizontal coordinate of the coordinate point is greater than or equal to the inflection point, the coordinate point is an oil coordinate point.

[0050] S205: When the horizontal coordinate of the coordinate point is smaller than the inflection point, the coordinate point is a water coordinate point.

[0051] The specific process of the embodiment of the present invention is as follows:

[0052] 1. Obtain multiple formation pressures based on cable logging data, each of which corresponds to each formation depth. Calculate each pseudo-pressure gradient corresponding to the formation depth based on each formation pressure corresponding to the formation depth and each formation depth.

[0053] In specific implementation, the pseudo-pressure gradient can be calculated by the following formula:

[0054]

[0055] Among them, P i 拟 is the pseudo-pressure gradient at the i-th pressure measuring point, P i is the i-th formation pressure (the pressure value at the i-th pressure measuring point), H i is the depth of the ith formation (the depth of the ith pressure measuring point).

[0056] Figure 3 is a well logging data table in the embodiment of the present invention. Figure 3As shown in FIG. 1 , the data in the logging data table are the cable logging pressure data of Well A in a deep-sea project overseas, including depth (formation depth), in meters (m); formation pressure, in pounds per square inch (psi); and pseudo-pressure gradient obtained by numerically transforming the formation pressure data in the deep pressure domain, in psi / m.

[0057] 2. Generate multiple coordinate points according to multiple sets of data, and calculate the slope of a straight line connecting any two adjacent coordinate points; wherein the two adjacent coordinate points are a first coordinate point and a second coordinate point, and the abscissa of the first coordinate point is smaller than the abscissa of the second coordinate point.

[0058] 3. Sort the multiple slopes in ascending order according to the size of the horizontal coordinate of the first coordinate point corresponding to each slope, divide the first slope of two adjacent slopes by the second slope, and when the divisor is greater than the threshold, take the first coordinate point corresponding to the second slope as the inflection point.

[0059] 4. When the horizontal coordinate of the coordinate point is greater than or equal to the inflection point, the coordinate point is an oil coordinate point. When the horizontal coordinate of the coordinate point is less than the inflection point, the coordinate point is a water coordinate point.

[0060] 5. Fit multiple oil coordinate points by the least square method to obtain the oil fitting curve; fit multiple water coordinate points by the least square method to obtain the water fitting curve.

[0061] Figure 4 It is a schematic diagram of a curve of formation depth and pseudo-pressure gradient in an embodiment of the present invention. Figure 5 It is a curve diagram of formation depth and formation pressure in the prior art. Figure 4 The horizontal axis is the pseudo-pressure gradient, in psi / m; the vertical axis is the formation depth, in m. Figure 4 The function expression of the oil fitting curve is y=-9213.1x+20773; the function expression of the water fitting curve is y=-96208x+162496. Figure 5 The horizontal axis is the formation pressure in psi, and the vertical axis is the formation depth in m. Figure 5 The function expression of the oil fitting curve is y=0.9587x-3239.2; the function expression of the water fitting curve is y=0.6184x-42.332.

[0062] 6. The formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve is taken as the oil-water interface depth.

[0063] from Figure 4 It can be clearly seen that the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve is approximately 5760 meters. Figure 5The angle between the oil fitting curve and the water fitting curve is very small, which makes it difficult to Figure 5 The formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve can be seen in the figure.

[0064] Therefore, compared with the prior art, the present invention makes full use of the differential change characteristics of oil-water density, which makes it easier and more accurate to identify the oil-water interface. After comprehensive interpretation of electrical measurement and comparative analysis of wellbore fluid sampling, it is found that the present invention is very consistent with the actual results, which confirms the accuracy and reliability of the present invention.

[0065] In summary, the method for determining the oil-water interface depth in an embodiment of the present invention first obtains multiple sets of data, each set of data includes a formation depth and a pseudo-pressure gradient corresponding to the formation depth, and then generates multiple coordinate points based on the multiple sets of data, and divides the multiple coordinate points into oil coordinate points and water coordinate points; then fits the multiple oil coordinate points and the multiple water coordinate points to obtain an oil fitting curve and a water fitting curve, respectively, and finally uses the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve as the oil-water interface depth, so as to quickly, concisely and accurately obtain the oil-water interface, improve the accuracy of reservoir reserve evaluation, reduce exploration and evaluation costs, and provide important support for the formulation of development plans.

[0066] Based on the same inventive concept, an embodiment of the present invention also provides a system for determining the depth of an oil-water interface. Since the principle of solving the problem by the system is similar to that of the method for determining the depth of an oil-water interface, the implementation of the system can refer to the implementation of the method, and the repeated parts will not be repeated.

[0067] Figure 6 : is a structural block diagram of the oil-water interface depth determination system in an embodiment of the present invention. Figure 6 As shown, the oil-water interface depth determination system includes:

[0068] An acquisition unit, used for acquiring multiple sets of data, each set of data including a formation depth and a pseudo-pressure gradient corresponding to the formation depth;

[0069] A coordinate point unit, used to generate multiple coordinate points according to multiple sets of data;

[0070] A division unit, used for dividing the plurality of coordinate points into oil coordinate points and water coordinate points;

[0071] A fitting unit is used to fit multiple oil coordinate points to obtain an oil fitting curve; and to fit multiple water coordinate points to obtain a water fitting curve;

[0072] The oil-water interface depth unit is used to take the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve as the oil-water interface depth.

[0073] In one embodiment, the acquisition unit is specifically used for:

[0074] Obtain multiple formation pressures, each corresponding to each formation depth;

[0075] According to each formation pressure corresponding to the formation depth and each formation depth, each pseudo-pressure gradient corresponding to the formation depth is calculated.

[0076] In one embodiment, the dividing unit is specifically used for:

[0077] Calculate the slope of a straight line connecting any two adjacent coordinate points; wherein the two adjacent coordinate points are a first coordinate point and a second coordinate point, and the abscissa of the first coordinate point is smaller than the abscissa of the second coordinate point;

[0078] According to the size of the horizontal coordinate of the first coordinate point corresponding to each slope, the multiple slopes are sorted in ascending order;

[0079] Divide the previous slope of two adjacent slopes by the next slope. When the divisor is greater than a threshold, take the first coordinate point corresponding to the next slope as the inflection point.

[0080] When the horizontal coordinate of a coordinate point is greater than or equal to the inflection point, the coordinate point is an oil coordinate point;

[0081] When the horizontal coordinate of a coordinate point is less than the inflection point, the coordinate point is a water coordinate point.

[0082] In one embodiment, a plurality of oil coordinate points are fitted by least square method to obtain an oil fitting curve;

[0083] The water fitting curve is obtained by fitting multiple water coordinate points using the least squares method.

[0084] In summary, the oil-water interface depth determination system of the embodiment of the present invention first obtains multiple groups of data, each group of data includes a formation depth and a pseudo-pressure gradient corresponding to the formation depth, and then generates multiple coordinate points according to the multiple groups of data, and divides the multiple coordinate points into oil coordinate points and water coordinate points; then fits the multiple oil coordinate points and the multiple water coordinate points to obtain an oil fitting curve and a water fitting curve, respectively, and finally uses the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve as the oil-water interface depth, so as to quickly, concisely and accurately obtain the oil-water interface, improve the accuracy of reservoir reserve evaluation, reduce exploration and evaluation costs, and provide important support for the formulation of development plans.

[0085] The embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, all or part of the contents of the method for determining the depth of the oil-water interface can be implemented. For example, when the processor executes the computer program, the following contents can be implemented:

[0086] Acquire multiple sets of data, each set of data including a formation depth and a pseudo-pressure gradient corresponding to the formation depth;

[0087] Generate multiple coordinate points according to multiple sets of data;

[0088] Divide the plurality of coordinate points into oil coordinate points and water coordinate points;

[0089] Fitting multiple oil coordinate points to obtain an oil fitting curve; fitting multiple water coordinate points to obtain a water fitting curve;

[0090] The formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve is taken as the oil-water interface depth.

[0091] In summary, the computer device of the embodiment of the present invention first obtains multiple groups of data, each group of data includes a formation depth and a pseudo-pressure gradient corresponding to the formation depth, and then generates multiple coordinate points according to the multiple groups of data, and divides the multiple coordinate points into oil coordinate points and water coordinate points; then fits the multiple oil coordinate points and the multiple water coordinate points to obtain an oil fitting curve and a water fitting curve, respectively, and finally uses the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve as the oil-water interface depth, so as to quickly, concisely and accurately obtain the oil-water interface, improve the accuracy of reservoir reserve evaluation, reduce exploration and evaluation costs, and provide important support for the formulation of development plans.

[0092] The embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, all or part of the contents of the method for determining the depth of the oil-water interface can be implemented. For example, when the processor executes the computer program, the following contents can be implemented:

[0093] Acquire multiple sets of data, each set of data including a formation depth and a pseudo-pressure gradient corresponding to the formation depth;

[0094] Generate multiple coordinate points according to multiple sets of data;

[0095] Divide the plurality of coordinate points into oil coordinate points and water coordinate points;

[0096] Fitting multiple oil coordinate points to obtain an oil fitting curve; fitting multiple water coordinate points to obtain a water fitting curve;

[0097] The formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve is taken as the oil-water interface depth.

[0098] In summary, the computer-readable storage medium of the embodiment of the present invention first obtains multiple groups of data, each group of data includes a formation depth and a pseudo-pressure gradient corresponding to the formation depth, and then generates multiple coordinate points according to the multiple groups of data, and divides the multiple coordinate points into oil coordinate points and water coordinate points; then fits the multiple oil coordinate points and the multiple water coordinate points to obtain an oil fitting curve and a water fitting curve, respectively, and finally uses the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve as the oil-water interface depth, so as to quickly, concisely and accurately obtain the oil-water interface, improve the accuracy of reservoir reserve evaluation, reduce exploration and evaluation costs, and provide important support for the formulation of development plans.

[0099] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0100] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0101] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0102] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1A function specified in one or more boxes.

[0103] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0104] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for determining the depth of an oil-water interface, characterized in that: include: Acquire multiple sets of data, each set of data including a formation depth and a pseudo-pressure gradient corresponding to the formation depth; Generate multiple coordinate points according to the multiple sets of data; dividing the plurality of coordinate points into oil coordinate points and water coordinate points; Fitting a plurality of the oil coordinate points to obtain an oil fitting curve; fitting a plurality of the water coordinate points to obtain a water fitting curve; The formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve is taken as the oil-water interface depth; Dividing the plurality of coordinate points into oil coordinate points and water coordinate points comprises: Calculating the slope of a straight line connecting any two adjacent coordinate points; wherein the two adjacent coordinate points are a first coordinate point and a second coordinate point, and the abscissa of the first coordinate point is smaller than the abscissa of the second coordinate point; According to the size of the horizontal coordinate of the first coordinate point corresponding to each slope, the multiple slopes are sorted in order from small to large; Divide the previous slope of two adjacent slopes by the next slope. When the divisor is greater than a threshold, take the first coordinate point corresponding to the next slope as the inflection point. When the horizontal coordinate of the coordinate point is greater than or equal to the inflection point, the coordinate point is an oil coordinate point; When the horizontal coordinate of the coordinate point is smaller than the inflection point, the coordinate point is a water coordinate point.

2. The method for determining the depth of the oil-water interface according to claim 1, characterized in that: Before getting multiple sets of data, it also includes: Obtain multiple formation pressures, each corresponding to each formation depth; According to each formation pressure corresponding to the formation depth and each formation depth, each pseudo-pressure gradient corresponding to the formation depth is calculated.

3. The method for determining the depth of the oil-water interface according to claim 1, characterized in that: Fitting a plurality of the oil coordinate points by the least square method to obtain an oil fitting curve; The water fitting curve is obtained by fitting a plurality of the water coordinate points using the least square method.

4. A system for determining the depth of an oil-water interface, characterized in that: include: An acquisition unit, used for acquiring multiple sets of data, each set of data including a formation depth and a pseudo-pressure gradient corresponding to the formation depth; A coordinate point unit, used to generate a plurality of coordinate points according to the plurality of sets of data; A division unit, used for dividing the plurality of coordinate points into oil coordinate points and water coordinate points; A fitting unit, used for fitting a plurality of the oil coordinate points to obtain an oil fitting curve; and fitting a plurality of the water coordinate points to obtain a water fitting curve; An oil-water interface depth unit, used to take the formation depth corresponding to the intersection of the oil fitting curve and the water fitting curve as the oil-water interface depth; The division unit is specifically used for: Calculating the slope of a straight line connecting any two adjacent coordinate points; wherein the two adjacent coordinate points are a first coordinate point and a second coordinate point, and the abscissa of the first coordinate point is smaller than the abscissa of the second coordinate point; According to the size of the horizontal coordinate of the first coordinate point corresponding to each slope, the multiple slopes are sorted in ascending order; Divide the previous slope of two adjacent slopes by the next slope. When the divisor is greater than a threshold, take the first coordinate point corresponding to the next slope as the inflection point. When the horizontal coordinate of the coordinate point is greater than or equal to the inflection point, the coordinate point is an oil coordinate point; When the horizontal coordinate of the coordinate point is smaller than the inflection point, the coordinate point is a water coordinate point.

5. The oil-water interface depth determination system according to claim 4, characterized in that: The acquisition unit is specifically used for: Obtain multiple formation pressures, each corresponding to each formation depth; According to each formation pressure corresponding to the formation depth and each formation depth, each pseudo-pressure gradient corresponding to the formation depth is calculated.

6. The oil-water interface depth determination system according to claim 4, characterized in that: The fitting unit is specifically used for: Fitting a plurality of the oil coordinate points by the least square method to obtain an oil fitting curve; The water fitting curve is obtained by fitting a plurality of the water coordinate points using the least square method.

7. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for determining the oil-water interface depth according to any one of claims 1 to 3 are implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for determining the oil-water interface depth according to any one of claims 1 to 3 are implemented.

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