CN-121996865-A - Method, device, equipment, storage medium and program product for determining fracture-cavity oil reservoir reserves

CN121996865ACN 121996865 ACN121996865 ACN 121996865ACN-121996865-A

Abstract

The embodiment of the application provides a method, a device, equipment, a storage medium and a program product for determining the reserves of a fracture-cavity type oil reservoir. The method comprises the steps of obtaining current data of crude oil under the current condition, original data of crude oil under the original condition, karst cave porosity, crack porosity and matrix porosity corresponding to a fracture-cave type oil reservoir at intervals of preset time, determining an oil reservoir comprehensive compression coefficient according to the karst cave porosity, the crack porosity and the matrix porosity, and determining fracture-cave type oil reservoir reserves according to the current data of crude oil under the current condition, the original data of crude oil under the original condition and the oil reservoir comprehensive compression coefficient. According to the application, by introducing the matrix, the fracture and the hole porosity, and adding the karst hole porosity, the fracture porosity and the matrix porosity in the process of calculating the reserves, the characteristics of different reservoir spaces are considered, the actual condition of the oil reservoir can be reflected more accurately, and more accurate dynamic reserves can be obtained.

Inventors

DENG XINGLIANG
ZHANG JIE
LIU ZHILIANG
WANG PENG
WANG PENG
LI GUOHUI
WANG ZHOUHUA
TU HANMIN
Liao Haoqi

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (13)

1. A method of determining a fracture-cavity reservoir reserve, comprising: acquiring current data of crude oil under the current condition corresponding to a fracture-cavity oil reservoir, original data of crude oil under the original condition, karst cavity porosity, fracture porosity and matrix porosity at preset intervals; Determining an oil reservoir comprehensive compression coefficient according to the karst cave porosity, the crack porosity and the matrix porosity; determining a fracture-cavity type oil reservoir reserve according to the current data of the crude oil under the current condition, the original data of the crude oil under the original condition and the comprehensive compression coefficient of the oil reservoir; The current data comprise oil extraction quantity of an oil reservoir, a first dissolved gas oil ratio of crude oil under the current condition, accumulated production gas oil ratio of the oil reservoir, water yield, a first crude oil volume coefficient of the crude oil under the current condition and a first pressure of the crude oil under the current condition, and the original data comprise a second crude oil volume coefficient of the crude oil under the original condition and a second pressure of the crude oil under the original condition.
2. The method of claim 1, wherein the determining the reservoir integrated compressibility based on the karst cave porosity, the fracture porosity, and the matrix porosity comprises: acquiring a pore compression coefficient, a seam-bound water saturation, a matrix-bound water saturation and a hole-bound water saturation and a water compression coefficient; And determining the reservoir comprehensive compression coefficient according to the pore compression coefficient, the seam-bound water saturation, the matrix-bound water saturation, the hole-bound water saturation, the water compression coefficient, the karst cave porosity, the fracture porosity and the matrix porosity.
3. The method of claim 1, wherein determining a fracture-cave reservoir reserve based on the current data of the crude oil under the current conditions, the raw data of the crude oil under the raw conditions, and the reservoir integrated compression factor comprises: calculating an oil reservoir value according to the oil reservoir produced oil quantity, the first crude oil volume coefficient, the oil reservoir accumulated production gas-oil ratio, the first dissolved gas-oil ratio, the gas volume coefficient, the water yield, the water volume coefficient, the second crude oil volume coefficient, the oil reservoir comprehensive compression coefficient, two compression coefficients, the first pressure and the second pressure; and determining the fracture-cavity type oil reservoir reserves according to the oil reservoir values.
4. The method of claim 3, wherein the reservoir values comprise a first reservoir value and a second reservoir value; Calculating an oil reservoir value from the oil reservoir produced oil volume, the first crude oil volume coefficient, the oil reservoir cumulative produced gas-oil ratio, the first dissolved gas-oil ratio, the gas volume coefficient, the water yield, the water volume coefficient, the second crude oil volume coefficient, the oil reservoir integrated compression coefficient, the two compression coefficients, the first pressure and the second pressure, comprising: Calculating the first oil reservoir value according to the oil reservoir oil production amount, the first crude oil volume coefficient, the oil reservoir accumulated production gas-oil ratio, the first dissolved gas-oil ratio, the gas volume coefficient, the water yield and the water volume coefficient; and calculating the second oil reservoir value according to the second crude oil volume coefficient, the oil reservoir comprehensive compression coefficient, the two compression coefficients, the first pressure and the second pressure.
5. The method of claim 4, wherein said determining said fracture-cave reservoir reserves from said reservoir values comprises: Substituting the first oil deposit value and the second oil deposit value into a fracture-cavity oil deposit substance balance equation, and calculating to obtain the fracture-cavity oil deposit reserve, wherein the fracture-cavity oil deposit substance balance equation is expressed as: Y=NX Wherein Y is the first oil reservoir value, N is the fracture-cavity oil reservoir reserve, and X is the second oil reservoir value.
6. The method of claim 3, wherein the raw data of the crude oil under the original condition comprises a second dissolved gas-to-oil ratio of the crude oil under the original condition, and wherein the two compression coefficients are determined by: And determining the two compression coefficients according to the first crude oil volume coefficient, the second dissolved gas-oil ratio, the first dissolved gas-oil ratio, the gas volume coefficient, the second crude oil volume coefficient, the first pressure and the second pressure.
7. The method according to any one of claims 1 to 6, wherein the karst cave porosity, the fracture porosity, the matrix porosity are obtained by: acquiring karst cave volume, fracture volume, matrix pore volume and rock volume under original conditions; Calculating the karst cave porosity according to the karst cave volume and the rock volume under the original condition, calculating the crack porosity according to the crack volume and the rock volume under the original condition, and calculating the matrix porosity according to the karst cave porosity, the crack porosity and the rock volume under the original condition.
8. The method according to any one of claims 1 to 6, further comprising: And determining the water multiple corresponding to the fracture-cavity oil reservoir reserve according to the corresponding relation between the fracture-cavity oil reservoir reserve and the water multiple and the reserve.
9. The method as recited in claim 1, further comprising: And calculating to obtain the pressure of the water body to the stratum according to the fracture-cavity oil reservoir reserves and the production data.
10. A fracture-cavity reservoir reserves determination device, comprising: The acquisition unit is used for acquiring current data of crude oil under the current condition, original data of crude oil under the original condition, karst cave porosity, crack porosity and matrix porosity corresponding to the fracture-cave type oil reservoir at intervals of preset time; The processing unit is used for determining the comprehensive compression coefficient of the oil reservoir according to the karst cave porosity, the crack porosity and the matrix porosity; the processing unit is also used for determining the fracture-cavity type oil reservoir reserves according to the current data of the crude oil under the current condition, the original data of the crude oil under the original condition and the comprehensive compression coefficient of the oil reservoir; The current data comprise oil extraction quantity of an oil reservoir, a first dissolved gas oil ratio of crude oil under the current condition, accumulated production gas oil ratio of the oil reservoir, water yield, a first crude oil volume coefficient of the crude oil under the current condition and a first pressure of the crude oil under the current condition, and the original data comprise a second crude oil volume coefficient of the crude oil under the original condition and a second pressure of the crude oil under the original condition.
11. An electronic device is characterized by comprising a memory and a processor; The memory stores computer-executable instructions; the processor executing computer-executable instructions stored in the memory, causing the processor to perform the method of one of claims 1 to 7.
12. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out the method of any one of claims 1 to 7.
13. A computer program product comprising a computer program which, when executed by a processor, implements the method of any of claims 1 to 7.

Description

Method, device, equipment, storage medium and program product for determining fracture-cavity oil reservoir reserves Technical Field The application relates to the technical field of oil reservoir development, in particular to a method, a device, equipment, a storage medium and a program product for determining the reserves of a fracture-cavity oil reservoir. Background The reservoir space of the fracture-cavity type carbonate reservoir is more in types, as small as micron-sized medium inter-grain solution holes and inter-grain holes, as large as tens of meters of large karst cavity, and different reservoir spaces are large in scale difference and uneven in distribution. In the fracture-cavity type development process, calculation of the dynamic reserves of oil reservoirs is an important link, and the dynamic reserves are the basis of oil field development and production and are also important parameters for evaluating oil reservoir development. The existing common oil reservoir dynamic reserve calculation method is mainly a material balance method, a material balance equation for calculating the fracture-cavity oil reservoir dynamic reserve is deduced by introducing a water-oil ratio, the equation can convert the water energy intensity into the water-oil ratio, the size of a water body communicated with the fracture-cavity reservoir is analyzed, and the reserve calculation is completed, and the method considers the influence of an internal oil-water coexisting water body or a water body communicated with the outside. The basic oil-gas reservoir unit of the fracture-cavity type oil reservoir is a discrete fracture-cavity body formed by multiple types of reservoir spaces of holes, cavities and fractures, the reservoir characteristics of the holes, the cavities and the fractures are not considered in the reservoir method, the specificity of the fracture-cavity type oil reservoir is not considered, and therefore, more accurate reservoir reserves cannot be obtained. Disclosure of Invention The embodiment of the application provides a method, a device, equipment, a storage medium and a program product for determining the reserves of a fracture-cavity oil deposit, which are used for solving the technical problem that the conventional oil deposit dynamic reserves method does not consider the specificity of the fracture-cavity oil deposit and can not obtain more accurate oil deposit reserves. In a first aspect, an embodiment of the present application provides a method for determining a fracture-cavity reservoir reserve, including: acquiring current data of crude oil under the current condition corresponding to a fracture-cavity oil reservoir, original data of crude oil under the original condition, karst cavity porosity, fracture porosity and matrix porosity at preset intervals; Determining an oil reservoir comprehensive compression coefficient according to the karst cave porosity, the crack porosity and the matrix porosity; determining a fracture-cavity type oil reservoir reserve according to the current data of the crude oil under the current condition, the original data of the crude oil under the original condition and the comprehensive compression coefficient of the oil reservoir; The current data comprise oil extraction quantity of an oil reservoir, a first dissolved gas oil ratio of crude oil under the current condition, accumulated production gas oil ratio of the oil reservoir, water yield, a first crude oil volume coefficient of the crude oil under the current condition and a first pressure of the crude oil under the current condition, and the original data comprise a second crude oil volume coefficient of the crude oil under the original condition and a second pressure of the crude oil under the original condition. In one possible embodiment, the determining the reservoir integrated compressibility based on the karst cave porosity, the fracture porosity, and the matrix porosity comprises: acquiring a pore compression coefficient, a seam-bound water saturation, a matrix-bound water saturation and a hole-bound water saturation and a water compression coefficient; And determining the reservoir comprehensive compression coefficient according to the pore compression coefficient, the seam-bound water saturation, the matrix-bound water saturation, the hole-bound water saturation, the water compression coefficient, the karst cave porosity, the fracture porosity and the matrix porosity. In one possible implementation manner, the determining the fracture-cavity oil reservoir reserves according to the current data of the crude oil under the current condition, the original data of the crude oil under the original condition and the oil reservoir comprehensive compression coefficient includes: calculating an oil reservoir value according to the oil reservoir produced oil quantity, the first crude oil volume coefficient, the oil reservoir accumulated production gas-oil ratio, the first dissolved gas-oil ratio, the gas v