Method, device and equipment for evaluating complex fault block developed dynamic loss geological reserves

Abstract

The embodiment of the application provides an evaluation method, device and equipment for complex fault block developed dynamic loss geological reserves, and belongs to the technical field of reservoir development. The evaluation method comprises the following steps: obtaining the injection-production relationship of oil-water wells of each layer in an oil-bearing area region, and performing single-well grid division on the oil-bearing area region according to the injection-production relationship of the oil-water wells, to obtain a plurality of single-well grids; determining the loss reserve type of each single-well grid based on the dynamic loss reserve causes of the oil-bearing area region; determining the loss reserve of each single-well grid according to the loss reserve type of each single-well grid; and determining the total loss reserve of each type of loss reserve type based on the loss reserve of each single-well grid. The application aims to more accurately obtain the loss reserve of a complex fault block reservoir.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil reservoir development, and particularly relates to a method, device and equipment for evaluating geological reserves lost by development dynamics of a complex fault block. BACKGROUND

[0002] A complex fault block reservoir has the characteristics of multiple oil layers in the vertical direction, high and low permeable reservoirs developed in each other, small development area of oil sand bodies in the plane, irregular geometry, and strong heterogeneity, and most of the complex fault block reservoirs are developed by using a triangular irregular well pattern. A commonly used method for evaluating lost reserves is to evaluate the water drive reserve control and the producing degree by means of the statistical oil layer thickness, which is used to evaluate the complex fault block reservoir. The method has poor adaptability and cannot truly reflect the water drive condition of the complex fault block reservoir. SUMMARY

[0003] The embodiment of the application provides a method for evaluating geological reserves lost by development dynamics of a complex fault block, which aims to facilitate the evaluation and judgment of the complex fault block reservoir and lay a foundation for developing comprehensive reservoir management and preparing an annual deployment development plan.

[0004] In a first aspect, the embodiment of the application provides a method for evaluating geological reserves lost by development dynamics of a complex fault block, which comprises the following steps:

[0005] Obtaining the injection-production relationship of oil-water wells in each layer position in the oil-bearing area region, and performing single-well grid division on the oil-bearing area region according to the injection-production relationship of the oil-water wells to obtain a plurality of single-well grids;

[0006] Based on the dynamic loss reserve causes of the oil-bearing area region, determining the loss reserve type of each single-well grid;

[0007] According to the loss reserve type of each single-well grid, determining the loss reserve of each single-well grid;

[0008] Based on the loss reserves of the single-well grids, determining the total loss reserves of each type of loss reserve.

[0009] Optionally, the obtaining of the injection-production relationship of oil-water wells in each layer position in the oil-bearing area region comprises:

[0010] Based on the production and perforation of each production well, the perforated production well is screened out, and the production well that is only perforated but not produced is removed;

[0011] Taking the injection well as the center, at least one production well related to the injection well is searched to form an initial injection-production relationship of oil-water wells;

[0012] According to the distance between the injection well and the production well, the spatial distribution of well locations, and the heterogeneity of the oil layer, a part to be deleted in the initial injection-production relationship of the oil-water well is determined, wherein the part to be deleted is a regionally intersected part;

[0013] The regionally intersected part in the initial injection-production relationship of the oil-water well is deleted, and a part in which a fault, a sand body boundary, and insufficient connectivity between the oil-water wells exist in the initial injection-production relationship of the oil-water well is deleted, to obtain the injection-production relationship of the oil-water well.

[0014] Optionally, the oil-bearing area region is divided into a plurality of single-well grids according to the injection-production relationship of the oil-water well by layer, comprising:

[0015] According to the injection-production relationship of the oil-water well, the oil-bearing area region is divided into a regular injection-production well pattern region, an irregular injection-production well pattern region, a no-injection / no-production well pattern region, and a development well pattern uncontrolled region;

[0016] A line connecting the production well adjacent to a first injection well in the regular injection-production well pattern region is taken as a center, and a line connecting a midpoint of a line connecting two adjacent production wells in the regular injection-production well pattern region and the first injection well is taken as a division line to divide the single-well grid in the regular injection-production well pattern region;

[0017] In the connection direction of the injection well and the production well in the irregular injection-production well pattern region, the injection well is expanded outward by one-third of the well spacing, the production well is expanded outward by one-half to one-third of the well spacing, and a line connecting a midpoint of a line connecting two adjacent production wells and the first injection well is taken as a division line to divide the single-well grid in the irregular injection-production well pattern region;

[0018] The area in a circular region with a preset well spacing of each production well in the no-injection / no-production well pattern region as a radius is taken as the single-well grid in the no-injection / no-production well pattern region;

[0019] The development well pattern uncontrolled region is divided into a plurality of small grids according to the sand body pinch boundary, the effective reservoir boundary, the closed fault boundary, and the regional boundary as the division basis, and the plurality of small grids are respectively merged into the single-well grid adjacent to the small grid which has been divided.

[0020] Optionally, the oil-bearing area region is divided into a development well pattern uncontrolled region, an injection-production well pattern uncontrolled region, a water drive uncontrolled region, a water drive uncontrolled region, and a water drive controlled region;

[0021] Based on the development well pattern uncontrolled region, the injection-production well pattern uncontrolled region, the water drive uncontrolled region, the water drive uncontrolled region, and the water drive controlled region, a dynamic loss reserve cause of the oil-bearing area region is determined.

[0022] Optionally, based on the dynamic loss reserve genesis of the oil-bearing area region, the loss reserve type of each single well grid is determined, comprising:

[0023] If there is no injection well or production well in the single well grid, it is judged that the single well grid is a development well pattern uncontrolled loss reserve type;

[0024] If there is only one injection well or one production well in the single well grid, it is judged that the single well grid is an injection-production well pattern uncontrolled loss reserve type;

[0025] If there is no injection well or production well in the single well grid due to well condition, and there is an injection well or production well in the single well grid that is not shot open, it is judged that the single well grid is a non-perforation loss reserve type;

[0026] If the sand body is connected between the injection well and the production well in the single well grid, and the injection well and the production well in the single well grid are both shot open, it is first judged that the single well grid belongs to one of the static injection-production unconnected loss reserve type, the dynamic injection-production unconnected loss reserve type, the water drive inefficient development loss reserve type and the water drive ineffective development loss reserve type;

[0027] If the injection well and the production well in the single well grid are not connected due to the formation of impermeable boundary or impermeable interlayer caused by sand body phase change or sand body overlap in the single well grid, it is judged that the single well grid is a static injection-production unconnected loss reserve type;

[0028] If the injection well and the production well in the single well grid are not connected due to the influence of plane / interlayer heterogeneity, it is judged that the single well grid is a dynamic injection-production unconnected loss reserve type;

[0029] If the water cut of the production well in the single well grid is greater than or equal to 90% and the geological reserve recovery degree is less than 25%, it is judged that the single well grid is a water drive inefficient development loss reserve type;

[0030] If the water cut of the production well in the single well grid is greater than or equal to 90% and the geological reserve recovery degree is greater than or equal to 25%, it is judged that the single well grid is a water drive ineffective development loss reserve type.

[0031] Optionally, according to the loss reserve type of each single well grid, the loss reserve of each single well grid is determined, comprising:

[0032] The original geological reserve and the cumulative oil production of each single well grid are calculated;

[0033] It is judged whether each single well grid is a development well pattern controlled;

[0034] If yes, the loss reserve of the single well grid is the difference between the original geological reserve and the cumulative oil production of the single well grid;

[0035] If no, the loss reserves of the single well grid are the original geological reserves of the single well grid.

[0036] Optionally, the original geological reserves of each single well grid are calculated by the following formula:

[0037]

[0038] In the formula, N is the original geological reserves, A is the oil-bearing area, So is the initial water saturation, Bo is the oil volume coefficient, po is the oil density, and H is the oil layer thickness.

[0039] Optionally, the cumulative oil production of each single well grid is determined by a production splitting method.

[0040] In a second aspect, an embodiment of the present application provides an evaluation device for loss geological reserves of a complex fault block reservoir, comprising:

[0041] An injection-production relationship acquisition module is configured to acquire injection-production relationships of oil and water wells of each layer in an oil-bearing area.

[0042] A single well grid division module is configured to divide the oil-bearing area by layer according to the injection-production relationships of the oil and water wells, to obtain a plurality of single well grids.

[0043] A loss reserves type determination module is configured to determine loss reserves types of each single well grid based on causes of dynamic loss reserves of the oil-bearing area.

[0044] A loss reserves determination module is configured to determine loss reserves of each single well grid according to the loss reserves type of each single well grid.

[0045] In a third aspect, an embodiment of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is executed by the processor to implement steps of the evaluation method for loss geological reserves of a complex fault block reservoir according to the first aspect.

[0046] Advantages: the classification of loss reserves is determined according to the causes of the loss reserves, the single well grid is divided according to the injection-production relationships of the oil and water wells, and the loss geological reserves type of each single well grid is determined one by one; finally, the loss reserves of each control area are determined according to the loss reserves type of each single well grid, and the loss reserves of each single well grid of each loss reserves type are added, so that the total loss reserves of the complex fault block reservoir in the oil-bearing area can be more accurately acquired, the complex fault block reservoir is evaluated and judged, and a foundation is laid for developing a comprehensive reservoir management and preparing an annual deployment development plan. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0048] Figure 1 is a step flow chart of the evaluation method according to an embodiment of the present application;

[0049] Figure 2 is a relationship diagram of injection wells and production wells of the evaluation method according to an embodiment of the present application;

[0050] Figure 3 is a loss reserve classification standard diagram of the evaluation method according to an embodiment of the present application;

[0051] Figure 4 is an injection-production well pattern corresponding and single well grid diagram of the evaluation method according to an embodiment of the present application;

[0052] Figure 5 is a structural schematic diagram of a device for evaluating the developed dynamic loss geological reserves of a complex fault block according to an embodiment of the present application. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0054] Embodiment one

[0055] Referring to Figure 1 , a step flow chart of the evaluation method of the developed dynamic loss geological reserves of a complex fault block according to an embodiment of the present application is shown, including the following steps:

[0056] In step S101, the injection-production relationship of oil-water wells in each layer in the oil-bearing area is obtained, and the oil-bearing area is divided into single well grids according to the injection-production relationship of oil-water wells, and a plurality of single well grids are obtained.

[0057] The water drive condition in the oil-bearing area region is relatively complex, and the injection-production relationship of each layer in the oil-bearing area region is obtained, and the single well grid is divided according to the injection-production relationship.

[0058] In step S102, the loss reserve type of each single well grid is determined based on the dynamic loss reserve causes of the oil-bearing area region.

[0059] In the embodiment, the loss reserve types of the oil-bearing area region are divided into seven types, including the development well grid non-controlled loss reserve type, the injection-production well grid non-controlled loss reserve type, the non-perforation loss reserve type, the static injection-production non-communicating loss reserve type, the dynamic injection-production non-communicating loss reserve type, the water drive low-efficiency production loss reserve type and the water drive ineffective production loss reserve type.

[0060] In step S103, the loss reserve of each single well grid is determined according to the loss reserve type of each single well grid.

[0061] By determining the loss reserve type of each single well grid, the loss reserve of each single well grid can be more accurately calculated.

[0062] In step S104, the total loss reserve of each loss reserve type is determined based on the loss reserve of each single well grid.

[0063] The evaluation method provided in the embodiment divides the oil-bearing area region into multiple single well grids according to the injection-production relationship of the oil-water well, determines the loss reserve type through the loss reserve causes, determines the loss geological reserve type of each single well grid one by one, finally determines the loss reserve of each single well grid according to the loss reserve type of each single well grid, adds the loss reserves of the single well grids of each loss reserve type, and thus the loss reserve of the complex fault block reservoir can be more accurately obtained, so as to evaluate and judge the complex fault block reservoir and lay a foundation for developing the comprehensive management of the reservoir and preparing the annual development plan.

[0064] Embodiment two

[0065] Reference Figure 1 , a step flow chart of a complex fault block developed dynamic loss geological reserve evaluation method in the embodiment of the application is shown, and the method specifically includes the following steps: Figure 1

[0066] In step S101, the injection-production relationship of each layer in the oil-bearing area region is obtained, and the single well grid is divided according to the injection-production relationship of each layer in the oil-bearing area region, and multiple single well grids are obtained.​

[0067] When obtaining the oil-water well injection-production relationship of each layer in an oil-bearing area, the following steps are included;

[0068] First, based on the production and perforation status of each oil well, perforated oil wells are screened out, and those that have only perforated but not yet produced are removed. At each stage of development in the oil-bearing area, it is necessary to statistically analyze the production and perforation status of each oil well to ensure complete and clear control of the production progress and data in the subsequent development process. Through production data, the perforation status of each oil well can be assessed. Oil wells that have been perforated but not yet producing are excluded because they lack an injection-production relationship; therefore, they are removed when establishing such a relationship.

[0069] Centered on the injection well, search for at least one production well related to the injection well to form the initial oil-water well injection-production relationship; the initial oil-water well injection-production relationship is the relationship between the production well and the injection well.

[0070] Reference Figure 2 The diagram shows the relationship between water injection wells and oil production wells in the evaluation method proposed in this embodiment. It shows the relationship between one water injection well and one oil production well, as well as the relationship between one water injection well and multiple oil production wells.

[0071] Based on the distance between injection and production wells, the spatial distribution of well locations, and the heterogeneity of the oil reservoir, the parts to be deleted in the initial oil-water well injection-production relationship are determined, including overlapping areas. These overlapping areas, as well as areas with faults, sand body boundaries, and insufficient connectivity between oil and water wells, are deleted to obtain the final oil-water well injection-production relationship. Some areas may overlap in the initial oil-water well injection-production relationship; these overlapping areas will affect the single-well grid division and therefore need to be deleted. Initial oil-water well injection-production relationships with faults, sand body boundaries, and insufficient connectivity between oil and water wells are invalid and also need to be deleted.

[0072] like Figure 3 and Figure 4 As shown, Figure 3 This embodiment shows a classification standard diagram of lost reserves; Figure 4 The diagram illustrates the correspondence between injection and production well networks and the schematic diagram of individual well grids in this embodiment. After obtaining the injection-production relationship between oil and water wells, the oil-bearing area is divided into individual well grids according to the stratigraphic level based on the oil-water well injection-production relationship, resulting in multiple individual well grids.

[0073] In the division of single well grid, according to the injection-production relationship of oil and water wells, the oil-bearing area is divided into regular injection-production well pattern area, irregular injection-production well pattern area, no injection / no production well pattern area and development well pattern uncontrolled area; and for different types of oil-bearing area, the single well grid is divided in the following manner.

[0074] In the regular injection-production well pattern area, the first injection well is taken as the center, the oil production well adjacent to the first injection well is connected, the midpoint of the connection line of the two adjacent oil production wells in the regular injection-production well pattern area and the connection line of the first injection well are taken as the division line to divide the single well grid in the regular injection-production well pattern area.

[0075] In the irregular injection-production well pattern area, the injection well and the oil production well are connected in the direction, the injection well is expanded outward by one third well spacing, the oil production well is expanded outward by one half to one third well spacing, and the midpoint of the connection line of the two adjacent oil production wells and the connection line of the first injection well are taken as the division line to divide the single well grid in the irregular injection-production well pattern area.

[0076] The area in the circular area with a preset well spacing of each oil production well in the no injection / no production well pattern area is taken as the single well grid in the no injection / no production well pattern area.

[0077] The development well pattern uncontrolled area is divided into multiple small grids according to the division basis of sand body pinch boundary, effective reservoir boundary, sealing fault boundary and regional boundary, and the multiple small grids are respectively merged into the single well grid adjacent to the small grid which has been divided.

[0078] Referring to Figure 2 The oil-bearing area is divided into development well pattern uncontrolled area, injection-production well pattern uncontrolled area, water drive uncontrolled area, water drive uncontrolled area, and water drive used area;

[0079] Based on the development well pattern uncontrolled area, injection-production well pattern uncontrolled area, water drive uncontrolled area, water drive uncontrolled area and water drive used area, the dynamic loss reserve cause of the oil-bearing area is determined.

[0080] The loss reserve cause of the development well pattern uncontrolled area includes the following points:

[0081] a. In the rolling development stage of the oilfield, it is gradually expanding to the oil-bearing boundary;

[0082] b. Affected by the fault and the oil-bearing area boundary, the risk of deploying development wells is larger;

[0083] c. There are uncertainties in the oil layer thickness, lithology, physical property and oiliness in the area, and the development risk is large;

[0084] d. The well control area is small at the boundary, the well control reserve is low, and no development well is deployed;

[0085] e. Near the oil-water boundary, a certain thickness of edge and bottom water needs to be properly avoided.

[0086] The causes of loss reserves in the uncontrolled area of injection-production well pattern include the following points:

[0087] a. Small sand body scale, only one well drilled oil sand body, no injection-production correspondence formed;

[0088] b. Within the injection-production well spacing, affected by the shielding effect of surrounding oil wells, no effective displacement formed;

[0089] c. Faults and sand body pinch-out affect the oil production well unable to communicate with the injection well;

[0090] d. Injection-production well pattern is not perfect;

[0091] e. Exceeding the limit injection-production well spacing, unable to form injection-production displacement system geological reserves.

[0092] The causes of loss reserves in the uncontrolled area of water drive include the following points:

[0093] 1) Main reasons for not shooting:

[0094] a. Layer combination reasons, not shot;

[0095] b. Oil layer is interpreted as water flooded layer or low oil saturation, not corresponding shot;

[0096] c. Avoiding bottom water;

[0097] d. Poor oil layer properties, low layer pressure, not shot;

[0098] e. To prevent well interference;

[0099] f. Engineering reasons.

[0100] 2) Main reasons for sealing layer after shooting:

[0101] a. Well condition reasons, well shut-in, layer sealed;

[0102] b. High water cut reasons, well shut-in, layer sealed;

[0103] c. Low liquid production reasons, well shut-in, layer sealed.

[0104] The causes of loss reserves in the uncontrolled area of water drive include the following points:

[0105] a. Plane anisotropy effect;

[0106] b. Vertical anisotropy effect;

[0107] c. Interlayer unevenness effect.

[0108] The causes of loss reserves controlled by water flooding in the developed area include the following points:

[0109] a. Narrow channel causes high permeation channel between oil and water wells;

[0110] b. Water channeling at the bottom of positive rhythm thick oil layer;

[0111] c. Fracturing reconstruction causes channeling between oil and water wells;

[0112] d. Large difference in oil and water viscosity, and serious fingering phenomenon;

[0113] e. Large injection-production pressure difference, and serious fingering phenomenon;

[0114] f. Water flow scouring and reconstruction of poor cementation reservoir pores.

[0115] Step S102, based on the dynamic loss reserve causes of the oil-bearing area region, determine the loss reserve type of each single well grid.

[0116] The loss reserve type includes the development well pattern uncontrolled loss reserve type, the injection-production well pattern uncontrolled loss reserve type, the unperforated loss reserve type, the static injection-production unconnected loss reserve type, the dynamic injection-production unconnected loss reserve type, the water flooding inefficiently developed loss reserve type and the water flooding inefficiently developed loss reserve type. The seven kinds of loss reserve types have different characteristics.

[0117] If there is no injection well or oil production well in the single well grid, it is judged that the single well grid is the development well pattern uncontrolled loss reserve type;

[0118] If there is only one injection well or one oil production well in the single well grid, it is judged that the single well grid is the injection-production well pattern uncontrolled loss reserve type;

[0119] If there is no injection well or oil production well in the single well grid due to well condition, and there is unperforated injection well or oil production well in the single well grid, it is judged that the single well grid is the unperforated loss reserve type;

[0120] If the sand body is connected between the injection well and the oil production well in the single well grid, and the injection well and the oil production well in the single well grid are perforated, it is first judged that the single well grid belongs to one of the static injection-production unconnected loss reserve type, the dynamic injection-production unconnected loss reserve type, the water flooding inefficiently developed loss reserve type and the water flooding inefficiently developed loss reserve type;

[0121] If the injection well and the oil production well in the single well grid are not connected due to the change of sand body or the formation of impermeable boundary or impermeable interlayer by sand body overlap, it is judged that the single well grid is the static injection-production unconnected loss reserve type;

[0122] If the injection well and the production well in the single well grid are not connected due to the influence of plane / interlayer heterogeneity, the single well grid is determined as the type of loss reserves of dynamic injection-production disconnection;

[0123] If the water cut of the production well in the single well grid is greater than or equal to 90% and the recovery degree of the geological reserves is less than 25%, the single well grid is determined as the type of loss reserves of low-efficiency water drive;

[0124] If the water cut of the production well in the single well grid is greater than or equal to 90% and the recovery degree of the geological reserves is greater than or equal to 25%, the single well grid is determined as the type of loss reserves of ineffective water drive.

[0125] Step S103, determining the loss reserves of each single well grid according to the type of loss reserves of each single well grid;

[0126] It includes: calculating the original geological reserves and the cumulative oil production of each single well grid, and then determining whether the development well pattern of each single well grid has been controlled;

[0127] If yes, the loss reserves of the single well grid are the original geological reserves of the grid;

[0128] If no, the loss reserves of the single well grid are the difference between the original geological reserves and the cumulative oil production of the single well grid.

[0129] Wherein, the original geological reserves of each single well grid are determined by the following formula:

[0130]

[0131] In the formula, N is the original geological reserves, A is the oil-bearing area, So is the initial water saturation, Bo is the oil volume coefficient, ρo is the oil density, and H is the oil layer thickness.

[0132] The determination of the oil saturation So includes the following methods:

[0133] a. If the microfacies map of the sublayer is relatively detailed, the microfacies where the single well is located is found. Generally, different microfacies are selected with different relative permeability curves in the numerical simulation calculation process. Different relative permeability curves have different endpoint values. Therefore, the oil saturation = 1 - irreducible water saturation.

[0134] b. When calculating the reserves, if the fine division of the microfacies is not performed, the method of average oil saturation is adopted.

[0135] c. The method of oil saturation at the well point is adopted.

[0136] d. The method of average oil saturation of the well point and the surrounding adjacent wells is adopted.

[0137] The oil layer thickness H is determined by the following methods:

[0138] a. The oil layer thickness of the production well point.

[0139] b. The average oil layer thickness of the well point and the surrounding adjacent well.

[0140] 3. The crude oil volume coefficient and the crude oil density

[0141] If the reservoir depth span is not large, a unified crude oil density and crude oil volume coefficient method is usually used.

[0142] The cumulative oil production of each single well grid is determined by the production splitting method; the production splitting method is a conventional method for obtaining cumulative oil production.

[0143] In step S104, the total loss reserves of each type of loss reserves are determined based on the loss reserves of each single well grid.

[0144] After the loss reserves of each single well grid are calculated by the above method, the loss reserves of the single well grid of the same loss reserves type are added by the loss reserves cause judgment result of the single well grid, so that the total loss reserves of each type of loss reserves can be obtained; and the total loss reserves result is more accurate.

[0145] In this embodiment, the oil-bearing area region is divided into multiple single well grids according to the injection-production relationship of the oil and water wells; the loss reserves type is determined by the cause of the loss reserves, and the loss reserves type of each single well grid is determined one by one; finally, the loss reserves of each single well grid is determined according to the loss reserves type of each single well grid, and the loss reserves of each single well grid of each loss reserves type is added. The loss reserves of the complex fault block reservoir can be more accurately obtained to evaluate and judge the complex fault block reservoir, and lay a foundation for developing reservoir comprehensive management and preparing annual deployment development plan.

[0146] Embodiment three

[0147] As shown in Figure 5 The embodiment provides a structure of a complex fault block developed dynamic loss geological reserves evaluation device, which comprises:

[0148] An oil-water well injection-production relationship acquisition module is configured to acquire the oil-water well injection-production relationship of each layer in the oil-bearing area region;

[0149] A single well grid division module is configured to divide the oil-bearing area region by layer according to the oil-water well injection-production relationship to obtain multiple single well grids;

[0150] A loss reserves type determination module is configured to determine the loss reserves type of each single well grid based on the dynamic loss reserves cause of the oil-bearing area region.

[0151] a loss reserve determination module, the loss reserve determination module being configured to determine a loss reserve of each of the single well grids according to a loss reserve type of each of the single well grids, and determine a total loss reserve of each of the loss reserve types based on the loss reserves of the single well grids.

[0152] As an optional example of the embodiments of the present application, the oil-water well injection-production relationship acquisition module is configured to implement the following steps:

[0153] Based on the production and perforation of each of the production wells, the perforated production wells are screened out, and the perforated production wells without production are removed;

[0154] Taking the water injection well as a center, at least one production well related to the water injection well is searched to form an initial oil-water well injection-production relationship;

[0155] According to the distance between the water injection well and the production well, the spatial distribution of the well sites, and the oil layer heterogeneity, a part to be deleted in the initial oil-water well injection-production relationship is determined, wherein the part to be deleted is a regionally intersected part;

[0156] The regionally intersected part in the initial oil-water well injection-production relationship and a part with insufficient connectivity between the water injection well and the production well due to faults or sand body boundaries are deleted to obtain the oil-water well injection-production relationship.

[0157] As an optional example of the embodiments of the present application, the single well grid division module is configured to implement the following steps:

[0158] According to the oil-water well injection-production relationship, an oil-bearing area region is divided into a regular injection-production well grid region, an irregular injection-production well grid region, a non-injection / non-production well grid region, and a development well grid region not controlled;

[0159] Taking a first water injection well in the regular injection-production well grid region as a center, connecting lines of production wells adjacent to the first water injection well are drawn, and a connecting line midpoint of adjacent two production wells in the regular injection-production well grid region and the connecting line of the first water injection well are taken as a division line to divide single well grids in the regular injection-production well grid region;

[0160] In a connection direction of the water injection well and the production well in the irregular injection-production well grid region, the water injection well is extended outward by one-third of a well spacing, the production well is extended outward by one-half to one-third of the well spacing, and a connecting line midpoint of adjacent two production wells and the connecting line of the first water injection well are taken as a division line to divide single well grids in the irregular injection-production well grid region;

[0161] An area in a circular region with a preset well spacing of each of the production wells in the non-injection / non-production well grid region as a radius is taken as a single well grid in the non-injection / non-production well grid region.

[0162] Divide the development well pattern uncontrolled area into a plurality of small grids based on the sand body pinch-out boundary, effective reservoir boundary, sealing fault boundary and regional boundary, and merge the plurality of small grids into the single well grid adjacent to the small grid respectively.

[0163] As an optional example of the embodiment of the present application, the loss reserve type determination module comprises a loss reserve cause determination unit and a single well grid loss reserve type determination unit.

[0164] The loss reserve cause determination unit is configured to implement the following steps:

[0165] Divide the oil-bearing area into a development well pattern uncontrolled area, an injection-production well pattern uncontrolled area, a water drive uncontrolled area, a water drive uncontrolled use area and a water drive used area.

[0166] Determine the dynamic loss reserve cause of the oil-bearing area based on the development well pattern uncontrolled area, the injection-production well pattern uncontrolled area, the water drive uncontrolled area, the water drive uncontrolled use area and the water drive used area.

[0167] The single well grid loss reserve type determination unit is configured to implement the following steps:

[0168] Determine the loss reserve type of each single well grid based on the dynamic loss reserve cause of the oil-bearing area, comprising:

[0169] If there is no injection well or production well in the single well grid, determine that the single well grid is a development well pattern uncontrolled loss reserve type.

[0170] If there is only one injection well or one production well in the single well grid, determine that the single well grid is an injection-production well pattern uncontrolled loss reserve type.

[0171] If there is no injection well or production well in the single well grid due to well condition, and there is an injection well or a production well that is not perforated in the single well grid, determine that the single well grid is a non-perforated loss reserve type.

[0172] If the sand body is connected between the injection well and the production well in the single well grid, and the injection well and the production well are perforated in the single well grid, first determine that the single well grid belongs to one of a static injection-production unconnected loss reserve type, a dynamic injection-production unconnected loss reserve type, a water drive inefficient use loss reserve type and a water drive ineffective use loss reserve type.

[0173] If a non-permeable boundary or non-permeable interlayer is formed between the injection well and the production well in the single well grid due to sand body phase change or sand body superimposed cutting, resulting in the non-communication between the injection well and the production well, the single well grid is determined as the static injection-production non-communication loss reserve type;

[0174] If the non-communication between the injection well and the production well is caused by the plane / interlayer heterogeneity in the single well grid, the single well grid is determined as the dynamic injection-production non-communication loss reserve type;

[0175] If the water cut of the production well in the single well grid is greater than or equal to 90% and the recovery degree of the geological reserve is less than 25%, the single well grid is determined as the water drive low-efficiency development loss reserve type.

[0176] If the water cut of the production well in the single well grid is greater than or equal to 90% and the recovery degree of the geological reserve is greater than or equal to 25%, the single well grid is determined as the water drive ineffective development loss reserve type.

[0177] As an optional example of the embodiment of the present application, the loss reserve determination module is used to implement the following steps:

[0178] The original geological reserve and the cumulative oil production of each single well grid are calculated;

[0179] It is determined whether the development well pattern of each single well grid has been controlled;

[0180] If yes, the loss reserve of the single well grid is the original geological reserve of the grid;

[0181] If no, the loss reserve of the single well grid is the difference between the original geological reserve and the cumulative oil production of the single well grid.

[0182] As an optional example of the embodiment of the present application, the loss reserve determination module comprises an original geological reserve calculation unit and a cumulative oil production calculation unit;

[0183] The original geological reserve calculation unit is used to calculate the original geological reserve of the single well grid by the following formula:

[0184]

[0185] In the formula, N is the original geological reserve, A is the oil-bearing area, So is the initial water saturation, Bo is the oil volume coefficient, ρo is the oil density and H is the oil layer thickness.

[0186] The cumulative oil production calculation unit determines the cumulative oil production of each single well grid by using the production splitting method.

[0187] For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the related parts can be referred to the part of the method embodiment.

[0188] Embodiment Four

[0189] The embodiment provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the method for evaluating the complex fault block developed dynamic loss geological reserves as described in Embodiment One and Embodiment Two.

[0190] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the embodiments can be referred to each other.

[0191] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, device, or computer program product. Therefore, the embodiments of the present application can adopt a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present application can adopt 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 codes.

[0192] The embodiments of the present application are described with reference to flowcharts and / or block diagrams according to the method, terminal device (system), and computer program product of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the computer or other programmable data processing terminal device produce a device for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The device for implementing the functions specified in one or more flows and / or blocks. Figure 1 The device for implementing the functions specified in one or more flows and / or blocks.

[0193] These computer program instructions can also be stored in a computer readable storage medium that can guide the computer or other programmable data processing terminal device to work in a specific manner, so that the instructions stored in the computer readable storage medium produce a product including instruction devices, which implement the functions specified in the flowcharts and / or block diagrams. Figure 1 The device for implementing the functions specified in one or more flows and / or blocks. Figure 1 The device for implementing the functions specified in one or more flows and / or blocks.

[0194] These computer program instructions can also be loaded into a computer or other programmable data processing terminal device, so that a series of operational steps are performed on the computer or other programmable terminal device to generate a computer implemented process, so that the instructions executed on the computer or other programmable terminal device provide a process for implementing the functions specified in the flowchart block(s) Figure 1 one or more flowcharts and / or blocks Figure 1 one or more flowcharts and / or blocks

[0195] Although the preferred embodiments of the application have been described, those skilled in the art will be able to make additional changes and modifications to these embodiments once they have the benefit of the present disclosure. Therefore, it is intended to include all such changes and modifications in the scope of the application as set forth in the following claims.

[0196] Finally, it should be noted that, in this document, the terms "first" and "second" and the like are used merely to distinguish one entity or action from another, and do not necessarily require or imply any actual such relationship or order between such entities or actions. Also, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or terminal device. An element proceeded by "comprises a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or terminal device that comprises the element.

[0197] The principles and implementations of the present application are described herein with specific examples. The above description of the embodiments is only intended to help understand the method of the present application and its core idea; for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation and application range; in view of the above, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method for evaluating the developed dynamic loss of geological reserves of a complex fault block, characterized in that, The method comprises the following steps: obtaining the injection-production relationship of oil-water wells in each layer of the oil-bearing area, and dividing the oil-bearing area by layer according to the injection-production relationship of oil-water wells to obtain a plurality of single-well grids; wherein the oil-bearing area is divided by layer according to the injection-production relationship of oil-water wells to obtain a regular injection-production well pattern area, an irregular injection-production well pattern area, a non-injection / non-production well pattern area, and a development well pattern uncontrolled area; dividing the oil-bearing area into a development well pattern uncontrolled area, an injection-production well pattern uncontrolled area, a water drive uncontrolled area, a water drive uncontrolled area, and a water drive used area; determining the dynamic loss reserve formation causes of the oil-bearing area based on the development well pattern uncontrolled area, the injection-production well pattern uncontrolled area, the water drive uncontrolled area, the water drive uncontrolled area, and the water drive used area; determining the loss reserve type of each single-well grid based on the dynamic loss reserve formation causes of the oil-bearing area; the loss reserve type includes a development well pattern uncontrolled loss reserve type, an injection-production well pattern uncontrolled loss reserve type, a non-perforated loss reserve type, a static injection-production discontinuity loss reserve type, a dynamic injection-production discontinuity loss reserve type, a water drive inefficient use loss reserve type, and a water drive ineffective use loss reserve type; determining the loss reserve of each single-well grid according to the loss reserve type of each single-well grid; determining the total loss reserve of each type of loss reserve based on the loss reserve of each single-well grid.

2. The method of claim 1, wherein, The method comprises the following steps: based on the production and perforation of each production well, screening out the perforated production well and removing the production well only perforated but not produced; taking the injection well as the center, searching for at least one production well related to the injection well to form an initial oil-water well injection-production relationship; determining the part to be deleted in the initial oil-water well injection-production relationship according to the distance between the injection well and the production well, the spatial distribution of the well site, and the oil layer heterogeneity, wherein the part to be deleted is the regionally intersected part; deleting the regionally intersected part in the initial oil-water well injection-production relationship, and the part with insufficient connectivity between the injection well and the production well due to the existence of faults and sand body boundaries, to obtain the oil-water well injection-production relationship.

3. The method of claim 1, wherein, The method comprises the following steps: dividing the oil-bearing area into a regular injection-production well pattern area, an irregular injection-production well pattern area, a non-injection / non-production well pattern area, and a development well pattern uncontrolled area according to the oil-water well injection-production relationship; taking a first injection well in the regular injection-production well pattern area as the center, connecting the production wells adjacent to the first injection well, and taking the midpoint of the connection line between the two adjacent production wells in the regular injection-production well pattern area and the connection line of the first injection well as a division line to divide the single-well grid in the regular injection-production well pattern area; In the connection direction of the injection well and the production well in the irregular injection-production well pattern area, the injection well extends outward by one third of the well spacing, the production well extends outward by one half to one third of the well spacing, and the midpoint of the line connecting the two adjacent production wells and the line connecting the first injection well are taken as the division line to divide the single well grid in the irregular injection-production well pattern area; The area of the circular area with the preset well spacing of each production well in the injection-free / production-free well pattern area is taken as the single well grid in the injection-free / production-free well pattern area; The development well pattern uncontrolled area is divided into multiple small grids according to the boundaries of sand body pinch, effective reservoir, sealing fault and regional boundary, and the multiple small grids are respectively merged into the single well grids adjacent to the small grids.

4. The method of claim 1, wherein, Based on the dynamic loss reserve causes of the oil-bearing area, the loss reserve type of each single well grid is determined, including: If there is no injection well or production well in the single well grid, it is judged that the single well grid is a development well pattern uncontrolled loss reserve type; If there is only one injection well or one production well in the single well grid, it is judged that the single well grid is an injection-production well pattern uncontrolled loss reserve type; If the injection well or the production well in the single well grid is closed due to well conditions, and the injection well or the production well in the single well grid is not shot open, it is judged that the single well grid is a non-perforation loss reserve type; If the sand body between the injection well and the production well in the single well grid is connected, and the injection well and the production well in the single well grid are both shot open, it is first judged that the single well grid belongs to one of the static injection-production unconnected loss reserve type, the dynamic injection-production unconnected loss reserve type, the water drive inefficient development loss reserve type and the water drive ineffective development loss reserve type; If the injection well and the production well in the single well grid are not connected due to the formation of impermeable boundary or impermeable interlayer caused by sand body phase change or sand body overlap in the single well grid, it is judged that the single well grid is a static injection-production unconnected loss reserve type; If the injection well and the production well in the single well grid are not connected due to the influence of plane / interlayer heterogeneity, it is judged that the single well grid is a dynamic injection-production unconnected loss reserve type; If the water cut of the production well in the single well grid is greater than or equal to 90% and the geological reserve recovery degree is less than 25%, it is judged that the single well grid is a water drive inefficient development loss reserve type; If the water cut of the production well in the single well grid is greater than or equal to 90% and the geological reserve recovery degree is greater than or equal to 25%, it is judged that the single well grid is a water drive ineffective development loss reserve type.

5. The method of claim 4, wherein, According to the loss reserve type of each single well grid, the loss reserve of each single well grid is determined, including: The original geological reserve and the cumulative oil production of each single well grid are calculated; It is judged whether each single well grid is a development well pattern controlled; If yes, the loss reserve of the single well grid is the difference between the original geological reserve and the cumulative oil production of the single well grid; If no, the loss reserve of the single well grid is the original geological reserve of the single well grid.

6. The method of claim 5, wherein, The original geological reserve of each single well grid is determined by the following formula: where N is the original geological reserves, A is the oil-bearing area, So is the initial water saturation, Bo is the oil volume coefficient, ρo is the oil density, and H is the oil layer thickness.

7. The method of claim 5, wherein the cumulative oil production of each individual well pattern is determined using a production partitioning method.

8. An apparatus for evaluating complex fault block developed dynamic loss of geological reserves, characterized in that, The method comprises the following steps: an injection-production relationship acquisition module, configured to acquire injection-production relationships of oil and water wells in each layer in the oil-bearing area; a single-well pattern division module, configured to divide the oil-bearing area by layer based on the injection-production relationships of the oil and water wells to obtain a plurality of single-well patterns; wherein the oil-bearing area is divided by layer into a regular injection-production well pattern area, an irregular injection-production well pattern area, a non-injection / non-production well pattern area, and a development well pattern uncontrolled area based on the injection-production relationships of the oil and water wells; a loss reserves type determination module, configured to determine loss reserves types of each single-well pattern based on dynamic loss reserves causes of the oil-bearing area; the loss reserves types include a development well pattern uncontrolled loss reserves type, an injection-production well pattern uncontrolled loss reserves type, a non-perforated loss reserves type, a static injection-production discontinuity loss reserves type, a dynamic injection-production discontinuity loss reserves type, a water drive inefficient production loss reserves type, and a water drive ineffective production loss reserves type; a loss reserves determination module, configured to determine loss reserves of each single-well pattern according to the loss reserves type of each single-well pattern, and determine total loss reserves of each type of loss reserves based on the loss reserves of each single-well pattern; wherein the loss reserves type determination module comprises a loss reserves cause determination unit and a single-well pattern loss reserves type determination unit; the loss reserves cause determination unit is configured to implement the following steps: divide the oil-bearing area into a development well pattern uncontrolled area, an injection-production well pattern uncontrolled area, a water drive uncontrolled area, a water drive uncontrolled production area, and a water drive produced area; determine dynamic loss reserves causes of the oil-bearing area based on the development well pattern uncontrolled area, the injection-production well pattern uncontrolled area, the water drive uncontrolled area, the water drive uncontrolled production area, and the water drive produced area.

9. An electronic device, comprising: The method comprises the following steps: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is executed by the processor to implement the steps of the method for evaluating complex fault block developed dynamic loss geological reserves according to any one of claims 1 to 7.

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