CN112446065A - Oil-water interface depth determination method and system - Google Patents
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Abstract
The invention provides a method and a system for determining the depth of an oil-water interface. The method for determining the depth of the oil-water interface comprises the following steps: acquiring a plurality of groups of data, wherein each group of data comprises a stratum depth and a pseudo pressure gradient corresponding to the stratum depth; generating a plurality of coordinate points according to the plurality of groups of data; dividing the plurality of coordinate points into oil coordinate points and water coordinate points; fitting a plurality of oil coordinate points to obtain an oil fitting curve; fitting a plurality of water coordinate points to obtain a water fitting curve; and taking the depth of the stratum corresponding to the intersection point of the oil fitting curve and the water fitting curve as the depth of the oil-water interface. The method can quickly, simply and accurately acquire the oil-water interface, improve the accuracy of reservoir reserves evaluation, reduce the exploration evaluation cost and provide important support for the formulation of a development scheme.
Description
Technical Field
The invention relates to the field of oil reservoirs, in particular to a method and a system for determining the depth of an oil-water interface.
Background
The proportion of deep sea oil hidden in global oil and gas exploration discovery is higher and higher, particularly in the last decade, the global important oil and gas discovery is concentrated in Brazilian deep sea oil and gas basins, and after the international oil price is raised in 2016, the investment of oil and gas projects is active, and the investment is high.
The conventional oil testing technology, well logging interpretation technology, pressure testing technology and other indirect technologies have the problems of complex testing, long period, high cost, large influence of external factors, difficulty in identifying an oil-water interface junction and the like when the oil-water interface is identified.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a method and a system for determining the depth of an oil-water interface, so that the oil-water interface can be quickly, simply and accurately obtained, the accuracy of reservoir reserve evaluation is improved, the exploration evaluation cost is reduced, and an important support is provided for the formulation of a development scheme.
In order to achieve the above object, an embodiment of the present invention provides an oil-water interface depth determining method, including:
acquiring a plurality of groups of data, wherein each group of data comprises a stratum depth and a pseudo pressure gradient corresponding to the stratum depth;
generating a plurality of coordinate points according to the plurality of groups of data;
dividing the plurality of coordinate points into oil coordinate points and water coordinate points;
fitting a plurality of oil coordinate points to obtain an oil fitting curve; fitting a plurality of water coordinate points to obtain a water fitting curve;
and taking the depth of the stratum corresponding to the intersection point of the oil fitting curve and the water fitting curve as the depth of the oil-water interface.
An embodiment of the present invention further provides a system for determining an oil-water interface depth, including:
the acquisition unit is used for acquiring a plurality of groups of data, and each group of data comprises a stratum depth and a pseudo pressure gradient corresponding to the stratum depth;
a coordinate point unit for generating a plurality of coordinate points from the plurality of sets of data;
a dividing unit for dividing the plurality of coordinate points into oil coordinate points and water coordinate points;
the fitting unit is used for fitting the plurality of oil coordinate points to obtain an oil fitting curve; fitting a plurality of water coordinate points to obtain a water fitting curve;
and the oil-water interface depth unit is used for taking the stratum depth corresponding to the intersection point of the oil fitting curve and the water fitting curve as the oil-water interface depth.
The embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the steps of the monitoring event processing method are implemented when the processor executes the computer program.
The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the monitoring event processing method are implemented.
The method and the system for determining the depth of the oil-water interface firstly acquire a plurality of groups of data, wherein each group of data comprises a stratum depth and a pseudo-pressure gradient corresponding to the stratum depth, then generate a plurality of coordinate points according to the plurality of groups of data, and divide the plurality of coordinate points into oil coordinate points and water coordinate points; and finally, the stratum depth corresponding to the intersection point of the oil fitting curve and the water fitting curve is used as the oil-water interface depth, so that the oil-water interface is quickly, simply and accurately obtained, the oil reservoir reserve evaluation precision is improved, the exploration evaluation cost is reduced, and important support is provided for the formulation of a development scheme.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining depth of an oil-water interface according to an embodiment of the present invention;
FIG. 2 is a flowchart of S103 in an embodiment of the present invention;
FIG. 3 is a log data table in an embodiment of the invention;
FIG. 4 is a graphical illustration of formation depth versus pseudo-pressure gradient in an embodiment of the invention;
FIG. 5 is a graphical illustration of formation depth versus formation pressure in a prior art system;
FIG. 6 is a block diagram of the oil-water interface depth determination system according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
In view of the problems of complex test, long period, high cost, large influence of external factors, difficulty in identifying the intersection point of the oil-water interface and the like in the process of identifying the oil-water interface in the prior art, the embodiment of the invention provides the oil-water interface depth determination method, so that the oil-water interface is rapidly, simply and accurately obtained, the accuracy of reservoir reserve evaluation is improved, the exploration evaluation cost is reduced, and an important support is provided for the formulation of a development scheme. The present invention will be described in detail below with reference to the accompanying drawings.
The technical principle of the invention is as follows: the stratum and the seawater layer above each pressure measuring point are collectively called as a physical stratum, the pressure value of an oil reservoir and water reservoir at each pressure measuring point of a target layer is assumed to be equivalent to the stratum pressure value generated by the physical stratum (the stratum and the seawater layer) above the point, meanwhile, the physical stratum is subjected to homogenization treatment, namely the density of the physical stratum is uniform, and the stratum pressure of the pressure measuring points is the linear relation of the homogenized density and the depth.
FIG. 1 is a flowchart of a method for determining depth of an oil-water interface according to an embodiment of the present invention. As shown in fig. 1, the method for determining the depth of the oil-water interface includes:
s101: and acquiring multiple groups of data, wherein each group of data comprises the stratum depth and the simulated pressure gradient corresponding to the stratum depth.
S102: a plurality of coordinate points are generated from the plurality of sets of data.
S103: the plurality of coordinate points are divided into oil coordinate points and water coordinate points.
S104: fitting a plurality of oil coordinate points to obtain an oil fitting curve; and fitting the plurality of water coordinate points to obtain a water fitting curve.
In specific implementation, a plurality of oil coordinate points can be fitted through a least square method to obtain an oil fitting curve; and fitting the plurality of water coordinate points by a least square method to obtain a water fitting curve.
S105: and taking the depth of the stratum corresponding to the intersection point of the oil fitting curve and the water fitting curve as the depth of the oil-water interface.
The main body of execution of the oil-water interface depth determination method shown in fig. 1 may be a computer. As can be seen from the process shown in fig. 1, the method for determining the depth of the oil-water interface according to the embodiment of the present invention first obtains a plurality of sets of data, each set of data includes a formation depth and a pseudo-pressure gradient corresponding to the formation depth, then generates a plurality of coordinate points according to the plurality of sets of data, and divides the plurality of coordinate points into oil coordinate points and water coordinate points; and finally, the stratum depth corresponding to the intersection point of the oil fitting curve and the water fitting curve is used as the oil-water interface depth, so that the oil-water interface is quickly, simply and accurately obtained, the oil reservoir reserve evaluation precision is improved, the exploration evaluation cost is reduced, and important support is provided for the formulation of a development scheme.
According to the principle of physical formation homogenization, all pressure measurement point data are converted into the product of the depth and the density corresponding to each point, according to the principle of maximum oil-water density differentiation, the density is greatly changed along with the depth due to the long-term oil sorting property and the gas-containing difference, the density of water is less changed along with the depth, and the deep pressure domain value transformation can be carried out according to the physical characteristics of oil and water, namely:
before executing S101, the method may further include: acquiring a plurality of formation pressures, wherein each formation pressure corresponds 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.
For example, the formation pressure at the ith pressure measurement point is Pi＝ρi×g×Hi；
Wherein, PiFormation pressure, p, for the ith pressure measurement pointiIs the density of the ith pressure measurement point after homogenization, g is the gravity acceleration, HiThe depth of the ith pressure measurement point (formation depth, pressure measurement point to sea level).
Pseudo pressure gradient at ith pressure measurement point:
wherein, Pi Pseudo-to-beThe pseudo pressure gradient of the ith pressure measurement point is obtained.
Fig. 2 is a flowchart of S103 in the embodiment of the present invention. As shown in fig. 2, S103 includes:
s201: calculating the slope of a straight line connecting any two adjacent coordinate points; the two adjacent coordinate points are respectively 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.
S202: and sequencing the slopes in a descending order according to the size of the abscissa of the first coordinate point corresponding to each slope.
S203: and dividing the former slope and the latter slope in the two adjacent slopes, and taking a first coordinate point corresponding to the latter slope as an inflection point when the divisor is larger than the threshold.
S204: and when the abscissa of the coordinate point is greater than or equal to the inflection point, the coordinate point is an oil coordinate point.
S205: and when the abscissa of the coordinate point is smaller than the inflection point, the coordinate point is a water coordinate point.
The specific process of the embodiment of the invention is as follows:
1. and acquiring a plurality of formation pressures according to the cable logging data, wherein each formation pressure corresponds 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.
In specific implementation, the pseudo-pressure gradient can be calculated by the following formula:
wherein, Pi Pseudo-to-bePseudo pressure gradient for the ith pressure measurement point, PiIs the ith formation pressure (pressure value of ith pressure measurement point), HiIs the ith formation depth (the depth of the ith pressure measurement point).
FIG. 3 is a well log data table in an embodiment of the invention. As shown in fig. 3, the data in the logging data table is a logging pressure data of a well cable of a deep sea item in overseas, including depth (formation depth) in meters (m); formation pressure in Pounds force per square inch (psi); and the pseudo pressure gradient is obtained by converting the formation pressure data through a deep pressure domain numerical value, and the unit is psi/m.
2. Generating a plurality of coordinate points according to the plurality of groups of data, and calculating the slope of a straight line connecting any two adjacent coordinate points; the two adjacent coordinate points are respectively 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.
3. And sequencing the slopes in a sequence from small to large according to the size of the abscissa of the first coordinate point corresponding to each slope, dividing the former slope and the latter slope in two adjacent slopes, and taking the first coordinate point corresponding to the latter slope as an inflection point when the divisor is larger than the threshold.
4. And when the abscissa of the coordinate point is greater than or equal to the inflection point, the coordinate point is an oil coordinate point. And when the abscissa of the coordinate point is smaller than the inflection point, the coordinate point is a water coordinate point.
5. Fitting a plurality of oil coordinate points by a least square method to obtain an oil fitting curve; and fitting the plurality of water coordinate points by a least square method to obtain a water fitting curve.
FIG. 4 is a graphical illustration of formation depth versus pseudo-pressure gradient in an embodiment of the present invention. FIG. 5 is a graphical representation of formation depth versus formation pressure in the prior art. FIG. 4 is a graph with a pseudo-pressure gradient in psi/m on the abscissa; the ordinate is the formation depth in m. The functional expression of the oil fit curve of fig. 4 is-9213.1 x + 20773; the functional expression of the water fit curve is-96208 x + 162496. The abscissa of FIG. 5 is formation pressure in psi; the ordinate is the formation depth in m. The functional expression of the oil fit curve of fig. 5 is y 0.9587 x-3239.2; the functional expression of the water fit curve is y ═ 0.6184 x-42.332.
6. And taking the depth of the stratum corresponding to the intersection point of the oil fitting curve and the water fitting curve as the depth of the oil-water interface.
As is clear from fig. 4, the intersection of the oil-fit curve and the water-fit curve corresponds to a formation depth of approximately 5760 meters or so. The included angle between the oil fitting curve and the water fitting curve in fig. 5 is very small, so that it is difficult to see the depth of the formation corresponding to the intersection point of the oil fitting curve and the water fitting curve in fig. 5.
Compared with the prior art, the method makes full use of the oil-water density difference change characteristics, is simpler and easier to identify the oil-water interface, and has higher identification accuracy. After comprehensive explanation of electrical measurement and sampling comparison analysis of borehole wall fluid, the invention is found to have very good goodness of fit with actual results, and the accuracy and reliability of the invention are verified.
To sum up, the method for determining the depth of the oil-water interface of the embodiment of the invention firstly obtains a plurality of groups of data, each group of data comprises a formation depth and a pseudo pressure gradient corresponding to the formation depth, then generates a plurality of coordinate points according to the plurality of groups of data, and divides the plurality of coordinate points into oil coordinate points and water coordinate points; and finally, the stratum depth corresponding to the intersection point of the oil fitting curve and the water fitting curve is used as the oil-water interface depth, so that the oil-water interface is quickly, simply and accurately obtained, the oil reservoir reserve evaluation precision is improved, the exploration evaluation cost is reduced, and important support is provided for the formulation of a development scheme.
Based on the same inventive concept, the embodiment of the invention also provides an oil-water interface depth determination system, and as the problem solving principle of the system is similar to that of the oil-water interface depth determination method, the implementation of the system can refer to the implementation of the method, and repeated details are omitted.
FIG. 6 is a block diagram of the oil-water interface depth determination system according to the embodiment of the present invention. As shown in fig. 6, the oil-water interface depth determination system includes:
the acquisition unit is used for acquiring a plurality of groups of data, and each group of data comprises a stratum depth and a pseudo pressure gradient corresponding to the stratum depth;
a coordinate point unit for generating a plurality of coordinate points from the plurality of sets of data;
a dividing unit for dividing the plurality of coordinate points into oil coordinate points and water coordinate points;
the fitting unit is used for fitting the plurality of oil coordinate points to obtain an oil fitting curve; fitting a plurality of water coordinate points to obtain a water fitting curve;
and the oil-water interface depth unit is used for taking the stratum depth corresponding to the intersection point of the oil fitting curve and the water fitting curve as the oil-water interface depth.
In one embodiment, the obtaining unit is specifically configured to:
acquiring a plurality of formation pressures, wherein each formation pressure corresponds 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.
In one embodiment, the dividing unit is specifically configured to:
calculating the slope of a straight line connecting any two adjacent coordinate points; the two adjacent coordinate points are respectively 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;
sequencing the slopes in a sequence from small to large according to the size of the abscissa of the first coordinate point corresponding to each slope;
dividing the former slope and the latter slope in the two adjacent slopes, and taking a first coordinate point corresponding to the latter slope as an inflection point when the divisor is larger than the threshold;
when the abscissa of the coordinate point is greater than or equal to the inflection point, the coordinate point is an oil coordinate point;
and when the abscissa of the coordinate point is smaller than the inflection point, the coordinate point is a water coordinate point.
In one embodiment, the oil fitting curve is obtained by fitting a plurality of oil coordinate points by a least square method;
and fitting the plurality of water coordinate points by a least square method to obtain a water fitting curve.
To sum up, the oil-water interface depth determination system of the embodiment of the invention first obtains multiple groups of data, each group of data comprises a formation depth and a pseudo pressure gradient corresponding to the formation depth, 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; and finally, the stratum depth corresponding to the intersection point of the oil fitting curve and the water fitting curve is used as the oil-water interface depth, so that the oil-water interface is quickly, simply and accurately obtained, the oil reservoir reserve evaluation precision is improved, the exploration evaluation cost is reduced, and important support is provided for the formulation of a development scheme.
The embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement all or part of the contents of the oil-water interface depth determination method, for example, the processor executes the computer program to implement the following contents:
acquiring a plurality of groups of data, wherein each group of data comprises a stratum depth and a pseudo pressure gradient corresponding to the stratum depth;
generating a plurality of coordinate points according to the plurality of groups of data;
dividing the plurality of coordinate points into oil coordinate points and water coordinate points;
fitting a plurality of oil coordinate points to obtain an oil fitting curve; fitting a plurality of water coordinate points to obtain a water fitting curve;
and taking the depth of the stratum corresponding to the intersection point of the oil fitting curve and the water fitting curve as the depth of the oil-water interface.
To sum up, the computer device of the embodiment of the invention first obtains a plurality of groups of data, each group of data comprises a stratum depth and a pseudo-pressure gradient corresponding to the stratum depth, then generates a plurality of coordinate points according to the plurality of groups of data, and divides the plurality of coordinate points into oil coordinate points and water coordinate points; and finally, the stratum depth corresponding to the intersection point of the oil fitting curve and the water fitting curve is used as the oil-water interface depth, so that the oil-water interface is quickly, simply and accurately obtained, the oil reservoir reserve evaluation precision is improved, the exploration evaluation cost is reduced, and important support is provided for the formulation of a development scheme.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored thereon, and when the computer program is executed by a processor, all or part of the contents of the oil-water interface depth determination method may be implemented, for example, when the processor executes the computer program, the following contents may be implemented:
acquiring a plurality of groups of data, wherein each group of data comprises a stratum depth and a pseudo pressure gradient corresponding to the stratum depth;
generating a plurality of coordinate points according to the plurality of groups of data;
dividing the plurality of coordinate points into oil coordinate points and water coordinate points;
fitting a plurality of oil coordinate points to obtain an oil fitting curve; fitting a plurality of water coordinate points to obtain a water fitting curve;
and taking the depth of the stratum corresponding to the intersection point of the oil fitting curve and the water fitting curve as the depth of the oil-water interface.
To sum up, the computer-readable storage medium of the embodiment of the present invention first obtains a plurality of sets of data, each set of data including a formation depth and a pseudo-pressure gradient corresponding to the formation depth, generates a plurality of coordinate points according to the plurality of sets of data, and divides the plurality of coordinate points into oil coordinate points and water coordinate points; and finally, the stratum depth corresponding to the intersection point of the oil fitting curve and the water fitting curve is used as the oil-water interface depth, so that the oil-water interface is quickly, simply and accurately obtained, the oil reservoir reserve evaluation precision is improved, the exploration evaluation cost is reduced, and important support is provided for the formulation of a development scheme.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An oil-water interface depth determination method is characterized by comprising the following steps:
acquiring a plurality of groups of data, wherein each group of data comprises a stratum depth and a pseudo pressure gradient corresponding to the stratum depth;
generating a plurality of coordinate points according to the plurality of groups of data;
dividing the plurality of coordinate points into oil coordinate points and water coordinate points;
fitting a plurality of oil coordinate points to obtain an oil fitting curve; fitting a plurality of water coordinate points to obtain a water fitting curve;
and taking the depth of the stratum corresponding to the intersection point of the oil fitting curve and the water fitting curve as the depth of an oil-water interface.
2. The method for determining the depth of an oil-water interface according to claim 1, further comprising, before acquiring the plurality of sets of data:
acquiring a plurality of formation pressures, wherein each formation pressure corresponds to each formation depth;
and calculating each pseudo pressure gradient corresponding to the stratum depth according to each stratum pressure corresponding to the stratum depth and each stratum depth.
3. The method of claim 1, wherein the 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; the two adjacent coordinate points are respectively 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;
sequencing the slopes in a sequence from small to large according to the size of the abscissa of the first coordinate point corresponding to each slope;
dividing the former slope and the latter slope in the two adjacent slopes, and taking a first coordinate point corresponding to the latter slope as an inflection point when the divisor is larger than the threshold;
when the abscissa of the coordinate point is greater than or equal to the inflection point, the coordinate point is an oil coordinate point;
and when the abscissa of the coordinate point is smaller than the inflection point, the coordinate point is a water coordinate point.
4. The method for determining an oil-water interface depth according to claim 1,
fitting a plurality of oil coordinate points by a least square method to obtain an oil fitting curve;
and fitting the plurality of water coordinate points by the least square method to obtain a water fitting curve.
5. An oil-water interface depth determination system, comprising:
the system comprises an acquisition unit, a processing unit and a control unit, wherein the acquisition unit is used for acquiring a plurality of groups of data, and each group of data comprises a stratum depth and a pseudo pressure gradient corresponding to the stratum depth;
a coordinate point unit for generating a plurality of coordinate points from the plurality of sets of data;
a dividing unit configured to divide the plurality of coordinate points into oil coordinate points and water coordinate points;
the fitting unit is used for fitting the oil coordinate points to obtain an oil fitting curve; fitting a plurality of water coordinate points to obtain a water fitting curve;
and the oil-water interface depth unit is used for taking the stratum depth corresponding to the intersection point of the oil fitting curve and the water fitting curve as the oil-water interface depth.
6. The oil-water interface depth determination system of claim 5, wherein the acquisition unit is specifically configured to:
acquiring a plurality of formation pressures, wherein each formation pressure corresponds to each formation depth;
and calculating each pseudo pressure gradient corresponding to the stratum depth according to each stratum pressure corresponding to the stratum depth and each stratum depth.
7. The oil-water interface depth determination system of claim 5, wherein the partitioning unit is specifically configured to:
calculating the slope of a straight line connecting any two adjacent coordinate points; the two adjacent coordinate points are respectively 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;
sequencing the slopes in a sequence from small to large according to the size of the abscissa of the first coordinate point corresponding to each slope;
dividing the former slope and the latter slope in the two adjacent slopes, and taking a first coordinate point corresponding to the latter slope as an inflection point when the divisor is larger than the threshold;
when the abscissa of the coordinate point is greater than or equal to the inflection point, the coordinate point is an oil coordinate point;
and when the abscissa of the coordinate point is smaller than the inflection point, the coordinate point is a water coordinate point.
8. The system of claim 5, wherein the fitting unit is specifically configured to:
fitting a plurality of oil coordinate points by a least square method to obtain an oil fitting curve;
and fitting the plurality of water coordinate points by the least square method to obtain a water fitting curve.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for determining a depth of an oil-water interface as claimed in any one of claims 1 to 4 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the oil-water interface depth determination method according to any one of claims 1 to 4.
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