CN-121993155-A - Method and device for determining fault block sand shale thin interbed type oil and gas reservoir potential layer

CN121993155ACN 121993155 ACN121993155 ACN 121993155ACN-121993155-A

Abstract

The invention discloses a method and a device for determining a fault block sand shale thin interbedded hydrocarbon reservoir potential layer, wherein the method comprises the steps of determining a first target potential layer list; combining geological knowledge of a fault block sand shale thin interbed hydrocarbon reservoir and sensitivity analysis of the reservoir in numerical simulation, determining sensitive parameters, determining first potential layer analysis parameters from the sensitive parameters, calculating comprehensive screening values of each target potential layer according to the first potential layer analysis parameter values, the residual reserve of the well layer and the current pressure maintenance level, adding the target potential layers with the comprehensive screening values larger than a preset threshold value into a second target potential layer list, analyzing the second potential analysis parameters for the target potential layers in the second target potential layer list, carrying out potential comprehensive calculation by combining the comprehensive screening values to obtain comprehensive potential values, and inquiring potential layer grades corresponding to the comprehensive potential values from the preset potential layer classification list. The invention can quantitatively analyze and predict the productivity of the target oil-gas field, and preferably select the target potential layer.

Inventors

CHENG ZIYUN
WANG PING
LIU XIAOYAN
WEI XIAOWEI
ZHANG XIAOLING
DING WEI
QU LIANGCHAO
HONG GUOLIANG
WANG WENWEN
DAI FANGWEN
KONG XIANGWEN
SHI HAIDONG

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (13)

1. A method for determining a fault block sand shale thin interbed type oil and gas reservoir potential layer is characterized by comprising the following steps: Determining a first target potential layer list of the fault block sand shale thin interbedded hydrocarbon reservoir potential layers of the target oil and gas field according to the data of the target oil and gas field; Combining geological knowledge of a fault block sand shale thin interbed type hydrocarbon reservoir with sensitivity analysis of the reservoir in numerical simulation, determining a sensitivity parameter to hydrocarbon yield, and determining a first potential layer analysis parameter from the sensitivity parameter; Calculating a comprehensive screening value of each target potential layer according to the first potential layer analysis parameter value, the well layer residual reserves and the current pressure maintenance level of each target potential layer in the first target potential layer list; Adding the target potential layer with the comprehensive screening value larger than a preset threshold value in the first target potential layer list into a second target potential layer list; analyzing second potential analysis parameters of the target potential layers in the second target potential layer list, and carrying out potential comprehensive calculation by combining the comprehensive screening values to obtain comprehensive potential values, wherein the second potential analysis parameters are parameters related to the standard sand body spreading and adjacent wells; and inquiring the potential layer grade corresponding to the comprehensive potential value of the target potential layer in the second target potential layer list from the preset potential layer dividing table.
2. The method of claim 1, wherein the data for the target field comprises log interpretation of the target field, single well reservoir use and test results, production data; according to the data of the target oil and gas field, determining a target potential layer list of the fault block sand shale thin interbedded hydrocarbon reservoir potential layer of the target oil and gas field, comprising: When the logging interpretation conclusion of the target oil and gas field is a dry layer, a water layer or an oil and gas layer which does not meet the preset requirements, determining that the target oil and gas field is not a target potential layer; when the logging interpretation conclusion of the target oil-gas field is that the oil-gas layer meets the preset requirement, analyzing the single well reservoir stratum use condition and the test result of the target oil-gas layer; If the single well reservoir of the target oil-gas layer is not used and the test result is the oil-gas layer, adding the target oil-gas field into the target potential layer list; If the single well reservoir use condition of the target hydrocarbon reservoir is used, analyzing production data of the target hydrocarbon reservoir; If the analysis result of the production data is that the target hydrocarbon reservoir stops producing in a preset short time, but the productivity exceeds a preset threshold, adding the target hydrocarbon reservoir into the target potential reservoir list.
3. The method of claim 1, wherein the first potential layer analysis parameters are a capacity coefficient and an effective porosity.
4. The method of claim 1, wherein calculating the composite screening value for each target potential layer based on the first potential layer analysis parameter value, the well layer remaining reserves, and the current pressure maintenance level for each target potential layer in the first target potential layer list comprises: Calculating a first screening value of each target potential layer according to a first potential layer analysis parameter value of each target potential layer in the first target potential layer list; Calculating a second screening value of each target potential layer according to the first screening value of each target potential layer and the residual reserves of the well layer; and calculating the comprehensive screening value of each target potential layer according to the second screening value of each target potential layer and the current pressure maintenance level.
5. The method of claim 4, wherein calculating a first screening value for each target potential layer based on the first potential layer analysis parameter value for each target potential layer in the target potential layer list comprises: Normalizing the first potential layer analysis parameters of each target potential layer; And calculating a first screening value of each target potential layer according to the normalized first potential layer analysis parameters and the corresponding weights.
6. The method of claim 4, wherein calculating a second screening value for each target potential layer based on the first screening value for each target potential layer and the well layer remaining reserves, comprises: Taking the ratio of the residual reserves of each target potential layer to the original geological reserves as the residual reserve ratio; The second screening value of each target potential layer is calculated by adopting the following formula: F i ＝E i ×R i Wherein F i is the second screening value of the ith target potential layer, E i is the first screening value of the ith target potential layer, and R i is the remaining reserve duty cycle of the ith target potential layer.
7. The method of claim 4, wherein the comprehensive screening value for each target potential layer is calculated from the second screening value and the current pressure maintenance level for each target potential layer using the formula: G i ＝F i ×P i Wherein G i is the third screening value of the ith target potential layer, F i is the second screening value of the ith target potential layer, and P i is the current pressure maintenance level of the ith target potential layer.
8. The method of claim 1, wherein the second potential analysis parameters include a target sand spread parameter, an adjacent well corresponding reservoir parameter, an adjacent well production parameter, and a relative adjacent well layer position; Analyzing the second potential analysis parameters for the target potential layers in the second target potential layer list, and carrying out potential comprehensive calculation by combining the comprehensive screening values to obtain comprehensive potential values, wherein the method comprises the following steps: Inquiring a potential parameter evaluation table, and determining a single value and a corresponding weight of a second potential analysis parameter of each target potential layer; and calculating the comprehensive potential value of each target potential layer according to the comprehensive screening value, the single value of each second potential analysis parameter and the corresponding weight.
9. The method of claim 8, wherein the composite potential value for each target potential layer is calculated from the composite filter value, the single value for each second potential analysis parameter, and the corresponding weights according to the following formula: Wherein Q i is the comprehensive potential value of the ith target potential layer, The single value of the kth second potential analysis parameter of the ith target potential layer, H K is the weight of the kth second potential analysis parameter, and G i is the comprehensive screening value of the ith target potential layer.
10. The utility model provides a fault block sand shale thin interbedded hydrocarbon reservoir potential layer determining means which characterized in that includes: The first target potential layer list determining module is used for determining a first target potential layer list of the broken block sand shale thin interbed type hydrocarbon reservoir potential layer of the target oil-gas field according to the data of the target oil-gas field; The first potential layer analysis parameter determining module is used for determining a sensitive parameter to oil and gas yield by combining geological knowledge of a broken block sand shale thin interbed oil and gas reservoir and sensitivity analysis to a reservoir in numerical simulation, and determining the first potential layer analysis parameter from the sensitive parameter; The first screening module is used for calculating the comprehensive screening value of each target potential layer according to the first potential layer analysis parameter value, the well layer residual reserve and the current pressure maintenance level of each target potential layer in the first target potential layer list; The second screening module is used for adding the target potential layer with the comprehensive screening value larger than the preset threshold value in the first target potential layer list into the second target potential layer list, analyzing second potential analysis parameters for the target potential layer in the second target potential layer list, and carrying out potential comprehensive calculation by combining the comprehensive screening value to obtain a comprehensive potential value, wherein the second potential analysis parameters are parameters related to the standard sand body spreading and the adjacent wells; The grade determining module is used for inquiring the grade of the potential layer corresponding to the comprehensive potential value of the target potential layer in the second target potential layer list from the preset potential layer dividing table.
11. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 9 when executing the computer program.
12. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, implements the method of any of claims 1 to 9.
13. A computer program product, characterized in that the computer program product comprises a computer program which, when executed by a processor, implements the method of any of claims 1 to 9.

Description

Method and device for determining fault block sand shale thin interbed type oil and gas reservoir potential layer Technical Field The invention relates to the technical field of oil and gas field development, in particular to a method and a device for determining a fault block sand shale thin interbedded hydrocarbon reservoir potential layer. Background This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section. The broken block hydrocarbon reservoir refers to a hydrocarbon reservoir formed by gathering hydrocarbon in broken block trapping, and is trapped by reservoir blocks which are cut by intersecting two or more faults along the upward inclination direction of the reservoir and are blocked and sealed for hydrocarbon. The complex fault block oil-gas reservoir is provided with a plurality of groups of fault cross cutting in different directions under the same construction background, so that the distribution of the fault blocks containing oil-gas is complicated, the distribution of the oil-gas-water system is complicated, and the difficulty in describing and predicting the reservoir is great. The thin interbedded sandstone hydrocarbon reservoir is a typical characteristic of deposition environments such as a braided river, a braided river delta and the like, and has the characteristics of thin reservoir, strong heterogeneity, frequent sand-mud interaction and the like. The complex sedimentation environment and geological structure background lead to how to dig and submerge the thin interbedded hydrocarbon reservoir of the complex broken block sand shale in the development process, especially in the middle and later stages of development, and face a plurality of challenges. The hole repairing measures are used for excavating hole repairing in the layers and the potential of interlayer succession, so that the method is an effective technical means for maintaining stable production of oil and gas fields. The oil-gas reservoirs of the type are strong in heterogeneity and complex in oil-gas-water system distribution, and how to find and evaluate the submerged target layer is a great difficulty in the current oil-gas development field. At present, the mining of thin interbed reservoirs of complex fault-block sand shale is mostly realized by a qualitative method, and the unused intervals are generally selected for screening by logging interpretation results and analogy methods, but the influence of the productivity of each potential interval and the production condition of an adjacent well cannot be quantitatively evaluated. Disclosure of Invention In a first aspect, an embodiment of the present invention provides a method for determining a thin interbed hydrocarbon reservoir potential layer of a broken-block sand shale, which can estimate the productivity of a target hydrocarbon field, preferably a target potential layer, from qualitative to quantitative analysis, the method comprising: Determining a first target potential layer list of the fault block sand shale thin interbedded hydrocarbon reservoir potential layers of the target oil and gas field according to the data of the target oil and gas field; Combining geological knowledge of a fault block sand shale thin interbed type hydrocarbon reservoir with sensitivity analysis of the reservoir in numerical simulation, determining a sensitivity parameter to hydrocarbon yield, and determining a first potential layer analysis parameter from the sensitivity parameter; Calculating a comprehensive screening value of each target potential layer according to the first potential layer analysis parameter value, the well layer residual reserves and the current pressure maintenance level of each target potential layer in the first target potential layer list; Adding the target potential layer with the comprehensive screening value larger than a preset threshold value in the first target potential layer list into a second target potential layer list; analyzing second potential analysis parameters of the target potential layers in the second target potential layer list, and carrying out potential comprehensive calculation by combining the comprehensive screening values to obtain comprehensive potential values, wherein the second potential analysis parameters are parameters related to the standard sand body spreading and adjacent wells; and inquiring the potential layer grade corresponding to the comprehensive potential value of the target potential layer in the second target potential layer list from the preset potential layer dividing table. In a second aspect, the embodiment of the present invention further provides a device for determining a potential layer of a thin interbed hydrocarbon reservoir of a broken-block sand shale, which can estimate the productivity of a target hydrocarbon field, preferably a target potential