Method and device for detecting interlayer crossflow in formation

Abstract

The present invention discloses a method and device for detecting interlayer crossflow in formations, wherein the method comprises: obtaining conventional logging data and PNN data of a target oil reservoir monitoring well; determining the initial water saturation of the monitoring well according to the conventional logging data; determining the current water saturation of the monitoring well according to the PNN data; determining the variation law of water saturation according to the initial water saturation and the current water saturation of the monitoring well; selecting a saturation variation mode according to the variation law of the water saturation, the saturation variation mode including: an interlayer crossflow mode dominated by external pipe crossflow and an interlayer crossflow mode dominated by geological anomalies; performing interlayer crossflow detection in formations according to the selected saturation variation mode. The present invention can detect interlayer crossflow phenomenon in formations, clearly judge whether there is pressure communication between reservoirs and the main reasons for the reduction of reservoir pressure.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploration and development, and in particular to a method and a device for detecting interlayer crossflow in formations. Background Art

[0002] During the production stage of oil reservoirs, there will be communication and crossflow between different oil reservoirs, that is, pressure communication. The reasons for the communication are complex and varied. It may be caused by reservoir geology, such as faults, cracks, or cracks opened due to production; it may also be caused by engineering reasons, such as pipe crossflow, stratum rupture caused by fracturing construction, etc.

[0003] In order to determine whether crossflow occurs between reservoirs, existing technologies usually use methods such as logging, testing, and microseismic monitoring. However, for the interlayer crossflow phenomenon where multiple potential factors coexist, it is impossible to clearly determine whether pressure communication exists between reservoirs and the main reasons for the reduction of reservoir pressure.

[0004] Therefore, there is an urgent need for a solution for detecting interlayer crossflow in formations that can overcome the above problems. Summary of the invention

[0005] The embodiment of the present invention provides a method for detecting inter-layer crossflow in formations, which is used to detect inter-layer crossflow in formations, clearly determine whether there is pressure communication between reservoirs and the main reasons for the reduction of reservoir pressure, and the method includes:

[0006] Obtain conventional logging data and PNN data of the target reservoir monitoring wells;

[0007] Determining the initial water saturation of the monitoring well according to the conventional well logging data;

[0008] Determining the current water saturation of the monitoring well according to the PNN data;

[0009] Determining a change pattern of water saturation according to the initial water saturation and the current water saturation of the monitoring well;

[0010] According to the variation law of the water saturation, a saturation variation mode is selected, wherein the saturation variation mode includes: an interlayer crossflow mode dominated by external crossflow of pipes and an interlayer crossflow mode dominated by geological anomalies;

[0011] According to the selected saturation change mode, inter-layer crossflow detection is carried out.

[0012] The embodiment of the present invention provides a formation interlayer crossflow detection device, which is used to detect the formation interlayer crossflow phenomenon, clearly determine whether there is pressure communication between oil reservoirs and the main reason for the reduction of oil reservoir pressure, and the device includes:

[0013] The first data acquisition module is used to obtain conventional logging data and PNN data of the target reservoir monitoring well;

[0014] A first saturation determination module, used to determine the initial water saturation of the monitoring well according to the conventional well logging data;

[0015] A second saturation determination module, used to determine the current water saturation of the monitoring well according to the PNN data;

[0016] A variation law determination module, used to determine the variation law of water saturation according to the initial water saturation and the current water saturation of the monitoring well;

[0017] A change mode selection module is used to select a saturation change mode according to the change law of the water saturation, and the saturation change mode includes: an interlayer crossflow mode dominated by pipe crossflow and an interlayer crossflow mode dominated by geological anomalies;

[0018] The interlayer crossflow detection module is used to perform interlayer crossflow detection according to the selected saturation change mode.

[0019] An 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, wherein the processor executes the method for detecting inter-layer crossflow in formations.

[0020] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the above-mentioned formation interlayer crossflow detection method.

[0021] Compared with the scheme of the prior art that uses logging, testing, and microseismic monitoring to detect interlayer crossflow in formations, the embodiment of the present invention obtains conventional logging data and PNN data of the target oil reservoir monitoring well; determines the initial water saturation of the monitoring well based on the conventional logging data; determines the current water saturation of the monitoring well based on the PNN data; determines the variation law of water saturation based on the initial water saturation and the current water saturation of the monitoring well; selects a saturation variation mode based on the variation law of water saturation, and the saturation variation mode includes: an interlayer crossflow mode dominated by external pipe crossflow and an interlayer crossflow mode dominated by geological anomalies; and performs interlayer crossflow detection in formations based on the selected saturation variation mode. The embodiment of the present invention divides the saturation change mode into an interlayer crossflow mode dominated by pipe crossflow and an interlayer crossflow mode dominated by geological anomalies. After obtaining conventional logging data and PNN data of the target reservoir monitoring well, the water saturation change law is determined according to the initial water saturation and current water saturation of the monitoring well and the saturation change mode is selected. Therefore, it is possible to clearly judge whether there is pressure communication between reservoirs and the main reason for the reduction of reservoir pressure according to the selected saturation change mode. There is no need to verify through a large number of tests and seismic data, which saves manpower and material resources and has strong operability. It is of great significance for the preparation of oil field development plans, dynamic analysis and later water injection development adjustments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. 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 creative work. In the drawings:

[0023] Figure 1 Schematic diagram of a method for detecting interlayer crossflow in a stratum according to an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of another method for detecting inter-layer crossflow in a stratum according to an embodiment of the present invention;

[0025] Figure 3 Schematic diagram of interlayer crossflow mode dominated by crossflow outside the tube in an embodiment of the present invention;

[0026] Figure 4 Schematic diagram of interlayer crossflow mode dominated by geological anomalies in an embodiment of the present invention;

[0027] Figures 5 to 9 It is a schematic diagram of inter-layer crossflow detection in a specific embodiment of the present invention;

[0028] Fig.10 It is a structural diagram of a device for detecting interlayer crossflow in a formation according to an embodiment of the present invention;

[0029] Fig.11 It is a structural diagram of another inter-stratum cross-flow detection device in an embodiment of the present invention;

[0030] Fig.12 It is a schematic diagram of the structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0032] As mentioned above, when cross-flow occurs between reservoirs and the causes are complex and varied, it is impossible to clearly determine whether there is pressure communication between reservoirs and the main reason for the reduction in reservoir pressure. Traditionally, a large amount of data is required to determine the cause of reservoir pressure reduction, such as testing and seismic data for verification. These data require a lot of manpower, energy and financial resources. Even so, sometimes it is impossible to clearly determine the cause of pressure drop.

[0033] In order to detect the inter-layer crossflow phenomenon of formations, clearly determine whether there is pressure communication between reservoirs and the main reasons for the reduction of reservoir pressure, an embodiment of the present invention provides a method for detecting inter-layer crossflow of formations, such as Figure 1 As shown, the method may include:

[0034] Step 101, obtaining conventional logging data and PNN data of a target reservoir monitoring well;

[0035] Step 102: determining the initial water saturation of the monitoring well according to the conventional well logging data;

[0036] Step 103: determining the current water saturation of the monitoring well according to the PNN data;

[0037] Step 104: determining a change rule of water saturation according to the initial water saturation and the current water saturation of the monitoring well;

[0038] Step 105: selecting a saturation change mode according to the variation law of the water saturation, wherein the saturation change mode includes: an interlayer crossflow mode dominated by pipe crossflow and an interlayer crossflow mode dominated by geological anomalies;

[0039] Step 106: Perform interlayer crossflow detection according to the selected saturation change mode.

[0040] Depend on Figure 1As shown, the embodiment of the present invention obtains conventional logging data and PNN data of the target oil reservoir monitoring well; determines the initial water saturation of the monitoring well according to the conventional logging data; determines the current water saturation of the monitoring well according to the PNN data; determines the variation law of water saturation according to the initial water saturation and the current water saturation of the monitoring well; selects a saturation variation mode according to the variation law of water saturation, and the saturation variation mode includes: an interlayer crossflow mode dominated by pipe crossflow and an interlayer crossflow mode dominated by geological anomalies; and performs interlayer crossflow detection according to the selected saturation variation mode. The embodiment of the present invention divides the saturation change mode into an interlayer crossflow mode dominated by pipe crossflow and an interlayer crossflow mode dominated by geological anomalies. After obtaining conventional logging data and PNN data of the target reservoir monitoring well, the water saturation change law is determined according to the initial water saturation and current water saturation of the monitoring well and the saturation change mode is selected. Therefore, it is possible to clearly judge whether there is pressure communication between reservoirs and the main reason for the reduction of reservoir pressure according to the selected saturation change mode. There is no need to verify through a large number of tests and seismic data, which saves manpower and material resources and has strong operability. It is of great significance for the preparation of oil field development plans, dynamic analysis and later water injection development adjustments.

[0041] In the embodiment, conventional logging data and PNN data of the target oil reservoir monitoring well are obtained.

[0042] In this embodiment, Figure 2 As shown, the formation interlayer crossflow detection method also includes:

[0043] Step 201, obtaining reservoir data of a target reservoir, wherein the reservoir data includes: conventional logging data, production logging data, seismic data, production dynamic data, and PNN data;

[0044] Step 202: Determine a target reservoir monitoring well based on the reservoir data, wherein the target reservoir monitoring well passes through a reservoir transition zone, and the PNN data is recorded before the target reservoir is produced.

[0045] During the specific implementation, the reservoir data of the target reservoir are collected and analyzed, including conventional logging data, production logging data, seismic data, production dynamic data, and PNN data, the possible causes of reservoir crossflow are analyzed, and wells passing through the transition zone are screened to find out the wells that have been tested for PNN and whose PNN data are recorded before large-scale production of the target reservoir. These wells are determined as target reservoir monitoring wells, which can be recorded as W1, W2, etc.

[0046] In an embodiment, the initial water saturation of the monitoring well is determined based on the conventional well logging data.

[0047] In this embodiment, the conventional logging data includes: formation water resistivity, formation resistivity and porosity;

[0048] Determining the initial water saturation of the monitoring well according to the conventional logging data includes: determining the current water saturation of the monitoring well according to the formation water resistivity, formation resistivity and porosity.

[0049] In this embodiment, determining the initial water saturation of the monitoring well based on the conventional logging data further includes: determining the current water saturation of the monitoring well using Archie's formula based on the formation water resistivity, formation resistivity and porosity.

[0050] In this embodiment, the current water saturation of the monitoring well is determined according to the formation water resistivity, formation resistivity and porosity according to the following formula:

[0051]

[0052] Among them, a is the lithology coefficient, b is the coefficient, m is the cementation index, n is the saturation index, R w is the formation water resistivity, R t is the formation resistivity and Φ is the porosity.

[0053] In an embodiment, the current water saturation of the monitoring well is determined based on the PNN data; the changing law of the water saturation is determined based on the initial water saturation and the current water saturation of the monitoring well; and a saturation change mode is selected based on the changing law of the water saturation, and the saturation change mode includes: an interlayer crossflow mode dominated by external pipe crossflow and an interlayer crossflow mode dominated by geological anomalies.

[0054] In this embodiment, according to the variation law of the water saturation, a saturation variation mode is selected, including:

[0055] If the current water saturation is greater than the initial water saturation, the saturation change mode is an interlayer crossflow mode dominated by pipe crossflow;

[0056] If the current water saturation is less than the initial water saturation, the saturation change mode is an interlayer cross-flow mode dominated by the geological anomaly.

[0057] In the specific implementation, the saturation change mode under different factors was established, including: the interlayer crossflow mode dominated by pipe crossflow and the interlayer crossflow mode dominated by geological anomalies. The two modes are explained in detail below:

[0058] Figure 3This is an interlayer crossflow mode dominated by pipe crossflow. The wells with pipe crossflow are located within the oil-bearing area. When pipe crossflow occurs, the fluid flows through the single well to other reservoirs, and the pressure in the middle of the reservoir decreases. As the pressure in the middle of the reservoir decreases, the edge water rises, and the pressure is transmitted upward by the edge water, that is, water drives oil. At this time, the oil-water interface rises, and the water saturation of the wells located in the transition zone increases, where oil saturation = 1-water saturation.

[0059] Figure 4 It is an interlayer cross-flow mode dominated by geological anomalies. It is assumed that there are monitoring wells in the direction of the geological anomaly and in the opposite direction of the geological anomaly, and both record conventional logging and PNN data. When there is a geological anomaly, the anomaly is located outside the oil-bearing area. Under the original reservoir state, the pressure of each reservoir remains balanced. When other reservoirs start to produce, the reservoir pressure decreases. At this time, a pressure difference is generated between the target reservoir and the production reservoir. Under this pressure difference, the geological anomaly is either closed or not. The geological anomaly will open. At this time, the fluid will flow from the target reservoir to the production reservoir. When the fluid flows vertically through the geological anomaly, the pressure near the geological anomaly decreases. At this time, there is a pressure difference between the pressure in the middle of the reservoir and the geological anomaly. Driven by pressure, the fluid in the middle of the reservoir will flow toward the geological anomaly. At this time, the transition zone on one side of the geological anomaly is characterized by oil driving water, and the water saturation in the transition zone decreases and the oil saturation increases. For the other side of the geological anomaly, when the fluid in the middle of the reservoir flows toward the geological anomaly, the pressure decreases. At this time, there is a pressure difference between the edge water and the middle of the reservoir on this side. The edge water moves upward under the pressure difference. At this time, water drives oil, and the water saturation of the monitoring wells on this side increases.

[0060] From the above, it can be concluded that for the interlayer crossflow mode dominated by pipe crossflow, the water saturation of the monitoring well increases, that is, the current water saturation is greater than the initial water saturation; while for the interlayer crossflow mode dominated by geological anomalies, the water saturation of the monitoring well decreases, that is, the current water saturation is less than the initial water saturation. Therefore, after determining the initial water saturation and current water saturation of the monitoring well, determine the law of change of water saturation, that is, whether the water saturation increases or decreases. According to the law of change of water saturation, select the saturation change mode. If the current water saturation is greater than the initial water saturation, the saturation change mode is the interlayer crossflow mode dominated by pipe crossflow; if the current water saturation is less than the initial water saturation, the saturation change mode is the interlayer crossflow mode dominated by geological anomalies.

[0061] In the embodiment, inter-layer crossflow detection is performed according to the selected saturation change mode.

[0062] In specific implementation, after the saturation change pattern is determined, the cause of the reservoir pressure drop can be determined.

[0063] A specific example is given below to illustrate the specific application of the method for detecting interlayer flow in formations according to the embodiment of the present invention. In this specific example, oil field A is a typical porous bioclastic limestone reservoir with an average porosity of 24% and an average permeability of 18.5 mD. Fractures are not well developed and are mainly developed in gentle slopes and beach phases. The reservoir has a complex pore throat structure and diverse pore types, showing strong vertical and weak planar heterogeneity. The vertical upper stratum reservoirs are complex and diverse, including Ru1, Ru2a, Ru2b-U, Ru2b-L, and Ru3. Among them, Ru1 and Ru3 are bottom water reservoirs, and the rest are edge water reservoirs. The distribution of the reservoirs is as follows: Figure 5 As shown. The target reservoir is Ru2a. Currently, there are 86 wells drilled through the Ru2a layer in the AD1 well area, including 16 horizontal wells. The original formation pressure of the Ru2a reservoir is 4792psi. As of January 1, 2017, the pressure of the Ru2a reservoir has dropped to 3774psi. At this time, only one well in the reservoir is producing, namely ADR2-3. The well perforated the top of Ru2a and Ru2b_U and produced for a total of 2 years (the liquid volume is contributed by both layers). The liquid production is not large, and the total liquid volume is less than 0.5% of the geological reserves of Ru2a. The liquid production of ADR2-3 is not enough to cause such a large pressure drop, and there must be pressure relief elsewhere. The time of pressure drop in this reservoir coincides with the time of large-scale production in other reservoirs. Therefore, it is predicted that Ru2a communicates with other reservoir pressure systems and affects each other, but it is still unclear what causes the pressure drop. Therefore, the analysis is carried out in the following steps:

[0064] 1. First, collect and analyze reservoir data, including conventional logging, production logging, seismic, production dynamics, PNN and other data, and analyze the possible causes of reservoir crossflow. Collect seismic data and analyze seismic attributes. There are two geological anomalies in the northeast and southwest of the reservoir, and both of them have the possibility of connecting the upper and lower reservoirs. Analyze the cementing data of all wells. Some wells have poor cementing quality. The cementing quality is poor. The layers with poor cementing quality will connect the target reservoir and other reservoirs, resulting in interlayer crossflow and causing Ru2a pressure reduction. If the cementing situation is Figure 6 However, due to data limitations, we are still unable to determine the real reason for the rapid drop in Ru2a pressure.

[0065] 2. Carefully screen all wells that pass through the transition zone and find out the wells that have been tested for PNN. If the PNN test data is recorded before the target reservoir is mass-produced, these wells are called monitoring wells. There are two such wells in this reservoir, ADM3-2 and ADR5-8. ADM3-2 is located in the transition zone close to the southwestern geological anomaly, and ADR5-8 is located in the transition zone close to the northeastern geological anomaly. The distribution of monitoring wells is shown in the figure below. Figure 7 shown.

[0066] 3. Based on the resistivity curve, the original water saturation of each well is calculated using the Archie formula (S w ) Ori ;

[0067] 4. The current water saturation of the monitoring well is interpreted through PNN data and recorded as (S w ) Now .

[0068] 5. Two models were established for the saturation variation patterns under different factors, including the interlayer crossflow pattern dominated by pipe crossflow and the interlayer crossflow pattern dominated by geological anomalies. Interlayer crossflow pattern dominated by pipe crossflow: The wells with pipe crossflow are located within the oil-bearing area. When pipe crossflow occurs, the fluid flows through a single well to other reservoirs, and the pressure in the middle of the reservoir decreases. As the pressure in the middle of the reservoir decreases, the edge water rises, and the pressure is transmitted upward by the edge water, that is, water drives oil. At this time, the oil-water interface rises, and the water saturation of the wells located in the transition zone increases. Interlayer crossflow pattern dominated by geological anomalies: It is assumed that there are monitoring wells in the direction of the geological anomaly and in the opposite direction of the geological anomaly, and both record conventional logging and PNN data. When there is a geological anomaly, the anomaly is located outside the oil-bearing area. In the original reservoir state, the pressure of each reservoir is balanced. When other reservoirs start to produce, the reservoir pressure decreases. At this time, a pressure difference is generated between the target reservoir and the producing reservoir. Under this pressure difference, the geological anomaly is either closed or not. The geological anomaly will open. At this time, the fluid will flow from the target reservoir to the producing reservoir. When the fluid flows vertically through the geological anomaly, the pressure near the geological anomaly decreases. At this time, there is a pressure difference between the pressure in the middle of the reservoir and the geological anomaly. Driven by pressure, the fluid in the middle of the reservoir will flow to the geological anomaly. At this time, the transition zone on one side of the geological anomaly is characterized by oil driving water. At this time, the water saturation of the transition zone decreases and the oil saturation increases; for the other side of the geological anomaly, when the fluid in the middle of the reservoir flows toward the geological anomaly, the pressure decreases. At this time, there is a pressure difference between the edge water and the middle of the reservoir on this side. The edge water moves upward under the pressure difference. At this time, it is water driving oil, and the water saturation of the monitoring well on this side increases.

[0069] 6. Through steps 2 and 3, the initial saturation and current saturation of the monitoring well are obtained. By comparing the saturation change patterns of the monitoring well and according to the saturation change patterns of the transition zones of the two modes in step 5, the cause of the reservoir pressure drop is determined. Figure 8-Figure 9The following are the interpretation results of wells ADM3-2 and ADR5-8, that is, the change of water saturation of the wells. Comparing the water saturation interpreted by PNN and the original water saturation, the water saturation of the two wells increased. If it is due to the pressure communication caused by the two geological anomalies in the northeast and southwest of the reservoir, according to step 5, the water saturation of the two monitoring wells is decreased, which is inconsistent with the time monitoring data. Therefore, it is speculated that the pressure drop of Ru2a is an interlayer crossflow mode dominated by pipe crossflow.

[0070] Based on the same inventive concept, the present invention also provides a device for detecting interlayer crossflow in formations, as described in the following embodiments. Since the principles for solving these problems are similar to the method for detecting interlayer crossflow in formations, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0071] Fig.10 : is a structural diagram of a formation interlayer crossflow detection device in an embodiment of the present invention, as shown in Fig.10 As shown, the device comprises:

[0072] The first data acquisition module 1001 is used to obtain conventional logging data and PNN data of the target oil reservoir monitoring well;

[0073] A first saturation determination module 1002 is used to determine the initial water saturation of the monitoring well according to the conventional well logging data;

[0074] A second saturation determination module 1003 is used to determine the current water saturation of the monitoring well according to the PNN data;

[0075] A variation rule determination module 1004 is used to determine a variation rule of water saturation according to the initial water saturation and the current water saturation of the monitoring well;

[0076] The change mode selection module 1005 is used to select a saturation change mode according to the change law of the water saturation, and the saturation change mode includes: an interlayer crossflow mode dominated by pipe crossflow and an interlayer crossflow mode dominated by geological anomalies;

[0077] The interlayer crossflow detection module 1006 is used to perform interlayer crossflow detection according to the selected saturation change mode.

[0078] In one embodiment, if Fig.11 As shown, the formation interlayer crossflow detection device also includes:

[0079] The second data acquisition module 1101 is used to obtain reservoir data of the target reservoir, wherein the reservoir data includes: conventional logging data, production logging data, seismic data, production dynamic data, and PNN data;

[0080] The monitoring well determination module 1102 is used to determine the target reservoir monitoring well according to the reservoir data, wherein the target reservoir monitoring well passes through the reservoir transition zone and the PNN data is recorded before the target reservoir is produced.

[0081] In one embodiment, the conventional logging data includes: formation water resistivity, formation resistivity and porosity;

[0082] The first saturation determination module 1002 is further used to determine the current water saturation of the monitoring well according to the formation water resistivity, formation resistivity and porosity.

[0083] In one embodiment, the first saturation determination module 1002 is further used to determine the current water saturation of the monitoring well according to the formation water resistivity, formation resistivity and porosity according to the following formula:

[0084]

[0085] Among them, a is the lithology coefficient, b is the coefficient, m is the cementation index, n is the saturation index, R w is the formation water resistivity, R t is the formation resistivity and Φ is the porosity.

[0086] In one embodiment, the change mode selection module 1005 is further used to:

[0087] If the current water saturation is greater than the initial water saturation, the saturation change mode is an interlayer crossflow mode dominated by pipe crossflow;

[0088] If the current water saturation is less than the initial water saturation, the saturation change mode is an interlayer cross-flow mode dominated by the geological anomaly.

[0089] In summary, the embodiment of the present invention obtains conventional logging data and PNN data of a target oil reservoir monitoring well; determines the initial water saturation of the monitoring well according to the conventional logging data; determines the current water saturation of the monitoring well according to the PNN data; determines the changing law of water saturation according to the initial water saturation and the current water saturation of the monitoring well; selects a saturation change mode according to the changing law of water saturation, the saturation change mode including: an interlayer crossflow mode dominated by external pipe crossflow and an interlayer crossflow mode dominated by geological anomalies; and performs interlayer crossflow detection according to the selected saturation change mode. The embodiment of the present invention divides the saturation change mode into an interlayer crossflow mode dominated by pipe crossflow and an interlayer crossflow mode dominated by geological anomalies. After obtaining conventional logging data and PNN data of the target reservoir monitoring well, the water saturation change law is determined according to the initial water saturation and current water saturation of the monitoring well and the saturation change mode is selected. Therefore, it is possible to clearly judge whether there is pressure communication between reservoirs and the main reason for the reduction of reservoir pressure according to the selected saturation change mode. There is no need to verify through a large number of tests and seismic data, which saves manpower and material resources and has strong operability. It is of great significance for the preparation of oil field development plans, dynamic analysis and later water injection development adjustments.

[0090] Based on the above invention concept, Fig.12 As shown, the present invention also proposes a computer device 1200, including a memory 1210, a processor 1220, and a computer program 1230 stored in the memory 1210 and executable on the processor 1220, wherein the processor 1220 implements the aforementioned inter-layer crossflow detection method when executing the computer program 1230.

[0091] Based on the aforementioned inventive concept, the present invention proposes a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the aforementioned interlayer crossflow detection method is implemented.

[0092] 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.

[0093] 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.

[0094] 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 1 A function specified in one or more boxes.

[0095] 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. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0096] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for detecting interlayer flow in a stratum, characterized in that: include: Obtain conventional logging data and PNN data of the target reservoir monitoring wells; The conventional logging data include: formation water resistivity, formation resistivity and porosity; Determining the initial water saturation of the monitoring well according to the conventional well logging data; Determining the current water saturation of the monitoring well according to the PNN data; Determining a change pattern of water saturation according to the initial water saturation and the current water saturation of the monitoring well; According to the variation law of the water saturation, a saturation variation mode is selected, wherein the saturation variation mode includes: an interlayer crossflow mode dominated by external crossflow of pipes and an interlayer crossflow mode dominated by geological anomalies; Conduct inter-layer crossflow detection according to the selected saturation change mode; Determining the initial water saturation of the monitoring well according to the conventional well logging data includes: determining the current water saturation of the monitoring well according to the formation water resistivity, formation resistivity and porosity according to the following formula: Among them, a is the lithology coefficient, b is the coefficient, m is the cementation index, n is the saturation index, R w is the formation water resistivity, R t is the formation resistivity, Φ is the porosity; According to the variation law of the water saturation, a saturation variation mode is selected, including: if the current water saturation is greater than the initial water saturation, the saturation variation mode is an interlayer crossflow mode dominated by pipe crossflow; if the current water saturation is less than the initial water saturation, the saturation variation mode is an interlayer crossflow mode dominated by geological anomalies.

2. The method for detecting interlayer flow in formation according to claim 1, characterized in that: Also includes: Obtaining reservoir data of the target reservoir, wherein the reservoir data includes: conventional logging data, production logging data, seismic data, production dynamic data, and PNN data; According to the reservoir data, a target reservoir monitoring well is determined, wherein the target reservoir monitoring well passes through a reservoir transition zone, and the PNN data is recorded before the target reservoir is produced.

3. A device for detecting interlayer flow in formations, characterized in that: include: The first data acquisition module is used to obtain conventional logging data and PNN data of the target reservoir monitoring well; The conventional logging data include: formation water resistivity, formation resistivity and porosity; A first saturation determination module, used to determine the initial water saturation of the monitoring well according to the conventional well logging data; A second saturation determination module, used to determine the current water saturation of the monitoring well according to the PNN data; A variation law determination module, used to determine the variation law of water saturation according to the initial water saturation and the current water saturation of the monitoring well; A change mode selection module is used to select a saturation change mode according to the change law of the water saturation, and the saturation change mode includes: an interlayer crossflow mode dominated by pipe crossflow and an interlayer crossflow mode dominated by geological anomalies; An interlayer crossflow detection module is used to detect interlayer crossflow according to the selected saturation change mode; The first saturation determination module is further used to determine the current water saturation of the monitoring well according to the formation water resistivity, formation resistivity and porosity according to the following formula: Among them, a is the lithology coefficient, b is the coefficient, m is the cementation index, n is the saturation index, R w is the formation water resistivity, R t is the formation resistivity, Φ is the porosity; The change mode selection module is further used for: if the current water saturation is greater than the initial water saturation, the saturation change mode is an interlayer crossflow mode dominated by pipe crossflow; if the current water saturation is less than the initial water saturation, the saturation change mode is an interlayer crossflow mode dominated by geological anomalies.

4. The inter-layer cross-flow detection device according to claim 3, characterized in that: Also includes: The second data acquisition module is used to obtain reservoir data of the target reservoir, wherein the reservoir data includes: conventional logging data, production logging data, seismic data, production dynamic data, and PNN data; The monitoring well determination module is used to determine the target reservoir monitoring well according to the reservoir data, wherein the target reservoir monitoring well passes through the reservoir transition zone, and the PNN data is recorded before the target reservoir is produced.

5. 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 method according to any one of claims 1 to 2 is implemented.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 2 is implemented.

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