CN-122018019-A - Method, device, equipment and medium for determining fluid properties of dolomite mudstone reservoir

CN122018019ACN 122018019 ACN122018019 ACN 122018019ACN-122018019-A

Abstract

The application discloses a method, a device, equipment and a medium for determining the fluid properties of a dolomite mudstone reservoir, which are applied to the field of exploration. The method for determining the fluid properties of the dolomite mudstone reservoir comprises the steps of detecting the resistivity of the dolomite mudstone reservoir to be detected to obtain a resistivity data set, determining a resistivity abnormal value according to the resistivity data set, determining a resistivity median value according to the resistivity data set and the resistivity abnormal value, determining a reservoir space evaluation factor according to the resistivity median value and the resistivity characteristic value, and comprehensively analyzing the reservoir space evaluation factor, the resistivity median value and the resistivity characteristic value to determine the fluid properties of the dolomite mudstone reservoir to be detected. According to the application, the fluid property of the dolomite mudstone reservoir to be measured is obtained by comprehensively analyzing and judging the three groups of data of the acquired reservoir space evaluation factor, the resistivity median value and the resistivity characteristic value, the problem that the conventional logging data cannot accurately evaluate the fracture-cavity reservoir is solved, and the effective and accurate evaluation of the reservoir space is realized.

Inventors

LAN YONGTAO
ZHAO JUNFENG
LI NING
ZHAO WEIXIANG
LI FENGQIN
LING ZHIHONG
SUN BING

Assignees

中国石油化工集团有限公司
中石化石油工程技术服务股份有限公司
中石化经纬有限公司
中石化经纬有限公司中原测控公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (10)

1. A method for determining fluid properties of a dolomitic mudstone reservoir, comprising: Resistivity detection is carried out on the dolomite mudstone reservoir to be detected, so that a resistivity data set is obtained; determining a resistivity anomaly from the resistivity dataset; determining a median resistivity value from the resistivity data set and the resistivity outlier; determining a reservoir space evaluation factor according to the resistivity median value and the resistivity characteristic value; And comprehensively analyzing the reservoir space evaluation factor, the resistivity median and the resistivity characteristic value to determine the fluid property of the dolomite mudstone reservoir to be tested.
2. The method of determining the nature of a dolomite mudstone reservoir fluid according to claim 1, wherein said determining a resistivity anomaly from said resistivity dataset comprises: Determining an upper quartile and a lower quartile of the resistivity according to the resistivity data; Determining an upper resistivity value and a lower resistivity value from the upper resistivity quartile and the lower resistivity quartile; determining a resistivity anomaly from the resistivity upper value and the resistivity lower value; Wherein, the expression of the quartile under the resistivity is: ; ; The expression of the quartile on the resistivity is: ; ; The expression of the upper limit value of the resistivity is as follows: ; the expression of the resistivity lower limit value is as follows: ; Wherein Q 1 is the lower quartile of the resistivity, L (n) is a function, P 1 is a first process value, P 2 is a second process value, Q Upper part is the upper limit of the resistivity, Q Lower part(s) is the lower limit of the resistivity, and n is the number of the resistivity data.
3. The method of determining the property of a dolomite mudstone reservoir fluid according to claim 1, wherein said determining a median resistivity value from said resistivity data set and said resistivity outlier comprises: determining a target resistivity data set from the resistivity data set and the resistivity outlier; Acquiring the number of the resistivity data of the target resistivity data set, and arranging the resistivities in the target resistivity data set from small to large; if the number of the resistivity data is odd, the expression of the median value of the resistivity is: If the number of the resistivity data is even, the expression of the median value of the resistivity is: ; Wherein R 0 is the median value of the resistivity, n is the number of the resistivity data, For the n/2 th resistivity, Is the (n/2 + 1) th resistivity, The (n+1)/2-th resistivity.
4. The method of determining the nature of a dolomite mudstone reservoir fluid according to claim 1, wherein said determining a reservoir space evaluation factor from said median resistivity, characteristic resistivity value comprises: Acquiring the resistivity characteristic value; and taking the ratio of the resistivity characteristic value and the resistivity median as the reservoir space evaluation factor.
5. The method of determining the nature of a dolomite mudstone reservoir fluid according to any one of claims 1-4, further comprising, after said determining a reservoir space evaluation factor from said median resistivity, characteristic resistivity value: performing preliminary judgment on the dolomite mudstone reservoir to be tested according to the reservoir space evaluation factor; when the reservoir space evaluation factor is not smaller than a preset factor, primarily judging that the reservoir is a dry layer; And when the reservoir space evaluation factor is smaller than the preset factor, preliminarily judging that the reservoir is an effective reservoir, wherein the effective reservoir comprises an oil layer, a water layer and an oil-water layer.
6. The method of claim 5, wherein the comprehensively analyzing the reservoir space evaluation factor, the median resistivity and the characteristic resistivity value comprises: establishing a resistivity median-reservoir space evaluation factor intersection plate according to the resistivity median and the reservoir space evaluation factor; Establishing a resistivity characteristic value-reservoir space evaluation factor intersection plate according to the resistivity characteristic value and the reservoir space evaluation factor; And determining the fluid property of the dolomite mudstone reservoir to be measured according to the resistivity median-reservoir space evaluation factor intersection plate and the resistivity characteristic value-reservoir space evaluation factor intersection plate.
7. The method of claim 6, wherein determining the fluid properties of the dolomite mudstone reservoir under test from the resistivity median-reservoir space evaluation factor intersection plot and the resistivity eigenvalue-reservoir space evaluation factor intersection plot comprises: when the resistivity characteristic value is smaller than a first characteristic value, the resistivity median is smaller than a first median, and the reservoir space evaluation factor is smaller than the preset factor, judging that the fluid property of the dolomite mudstone reservoir to be tested is the water layer; When the resistivity characteristic value is not smaller than a first characteristic value and the resistivity characteristic value is smaller than a second characteristic value, the resistivity median is not smaller than the first median and the resistivity characteristic value is smaller than the second median, and the reservoir space evaluation factor is smaller than the preset factor, judging that the fluid property of the dolomite mudstone reservoir to be tested is the oil-water same layer; And when the resistivity characteristic value is not smaller than the second characteristic value, the resistivity median is not smaller than the second median, and the reservoir space evaluation factor is smaller than a preset factor, judging that the fluid property of the dolomite mudstone reservoir to be measured is the oil layer.
8. A device for determining fluid properties of a dolomitic mudstone reservoir, comprising: the detection module is used for detecting the resistivity of the dolomite mudstone reservoir to be detected so as to obtain a resistivity data set; An abnormal value determining module for determining a resistivity abnormal value according to the resistivity data set; A median determining module for determining a median value of resistivity from the resistivity data set and the resistivity outlier; The evaluation factor determining module is used for determining a reservoir space evaluation factor according to the resistivity median value and the resistivity characteristic value; And the determining module is used for comprehensively analyzing the reservoir space evaluation factor, the resistivity median and the resistivity characteristic value to determine the fluid property of the dolomite mudstone reservoir to be tested.
9. An electronic device comprising a memory for storing a computer program; a processor for implementing the steps of a method for determining fluid properties of a dolomitic mudstone reservoir according to any of claims 1 to 7 when executing said computer program.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of a method for determining the properties of a dolomitic mudstone reservoir fluid according to any of claims 1 to 7.

Description

Method, device, equipment and medium for determining fluid properties of dolomite mudstone reservoir Technical Field The application relates to the field of exploration, in particular to a method, a device, equipment and a medium for determining the fluid properties of a dolomitic mudstone reservoir. Background With the continuous deep exploration and development, unconventional oil and gas reservoirs are increasingly valued. Dolomite mudstone reservoirs are used as an unconventional oil and gas reservoir to find out that oil fields have millions of tons of reserves and obtain industrial oil flows in more than ten wells. Thus, dolomite mudstone reservoirs have become an important point of exploration in oil fields. The dolomite mudstone reservoir is usually a good hydrocarbon source rock, has high organic carbon content, has an average value of 2.41% -4.07%, and has a good hydrocarbon production environment. The rock component is mainly composed of argillaceous and carbonate, pyrite is commonly seen, gypsum, quartz, siliceous and the like are additionally included, wherein the argillaceous accounts for 50% -57%, and the whole rock has the characteristics of more rock components, impurities and high argillaceous content. In addition, the reservoir space of the reservoir is complex, not only has inter-granular pores, but also has development fracture holes, and the fracture holes develop when the content of the white cloud is high, and the fracture holes develop when the content of the mud is high. In recent years, in the exploration and development of source-reservoir-integrated dolomite mudstone reservoirs, only a small portion of special oil fields can evaluate the reservoir space and fluid properties by means of electric imaging, nuclear magnetic resonance and the like. For most oil fields, only a conventional logging mode can be adopted, namely, a carbonate reservoir evaluation model and an Archie formula are adopted to evaluate the reservoir space and the fluid property. However, due to the influence of multiple factors such as changeable rock components, high mud content, complex reservoir space and the like, the conventional well logging mode evaluation cannot accurately identify the fluid properties, so that the conditions of 'interpreted oil layer water yielding and water layer oil production' are often caused, and the production requirements of the unconventional oil and gas reservoirs cannot be met. In view of the above-mentioned technology, finding a method for evaluating the fluid properties of a dolomitic mudstone reservoir is a problem to be solved by those skilled in the art. Disclosure of Invention The application aims to provide a method, a device, equipment and a medium for determining the fluid properties of a dolomitic mudstone reservoir. The method can solve the problem that the fluid property cannot be accurately identified by evaluating the conventional logging mode in the prior art. In order to solve the technical problems, the application provides a method for determining the fluid properties of a dolomite mudstone reservoir, which comprises the following steps: Resistivity detection is carried out on the dolomite mudstone reservoir to be detected, so that a resistivity data set is obtained; Determining a resistivity anomaly from the resistivity data set; Determining a resistivity median value from the resistivity data set and the resistivity outlier; determining a reservoir space evaluation factor according to the resistivity median value and the resistivity characteristic value; And comprehensively analyzing the reservoir space evaluation factor, the resistivity median value and the resistivity characteristic value to determine the fluid property of the dolomite mudstone reservoir to be tested. Preferably, determining the resistivity anomaly from the resistivity data set includes: Determining an upper quartile of resistivity and a lower quartile of resistivity from the resistivity data; Determining an upper limit value and a lower limit value of the resistivity according to the upper quartile and the lower quartile of the resistivity; determining an abnormal value of the resistivity according to the upper limit value and the lower limit value of the resistivity; Wherein, the expression of the lower quartile of the resistivity is: ; ; The expression of the quartile on resistivity is: ; ; the expression of the upper limit value of the resistivity is: ; the lower limit value of the resistivity is expressed as: ; Wherein Q 1 is the lower quartile of resistivity, L (n) is a function, P 1 is a first process value, P 2 is a second process value, Q Upper part is the upper limit of resistivity, Q Lower part(s) is the lower limit of resistivity, and n is the number of resistivity data. Preferably, determining the median resistivity value from the set of resistivity data and the resistivity outlier comprises: determining a target resistivity data set according to the resistivity data set