CN-121993157-A - Method and device for determining organic matter content, computer equipment and storage medium

CN121993157ACN 121993157 ACN121993157 ACN 121993157ACN-121993157-A

Abstract

The application provides a method, a device, computer equipment and a storage medium for determining organic matter content, and belongs to the technical field of petroleum and natural gas exploitation. The method comprises the steps of determining initial organic matter content of a first well section at a plurality of sampling depths based on a resistivity logging curve and a sonic time difference logging curve of the first well section, wherein the resistivity logging curve comprises logarithmic resistivity at the plurality of sampling depths, the sonic time difference logging curve comprises sonic time differences at the plurality of sampling depths, reconstructing the initial natural gamma logging curve of the first well section based on a natural potential logging curve of the first well section to obtain a natural gamma logging curve of the first well section, determining the clay content of the first well section at the plurality of sampling depths, and correcting the initial organic matter content based on the clay content of the sampling depths for each sampling depth to obtain target organic matter content of the sampling depths. The method improves accuracy of organic matter content.

Inventors

DONG XIAOWEI
CHEN SHUANGQING
MA JIANYING
ZHAO JUN
WANG CHANGLI
YIN LINGLING
ZHOU KEJIA
DONG YUEQI
ZHOU SUYAN
LIU HONGZHOU

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241106

Claims (10)

1. A method for determining the content of organic matter, the method comprising: Determining an initial organic content of a first wellbore interval at a plurality of sampling depths based on a resistivity log and a sonic moveout log of the first wellbore interval, the resistivity log comprising a log resistivity at the plurality of sampling depths, the sonic moveout log comprising a sonic moveout at the plurality of sampling depths; Reconstructing an initial natural gamma logging curve of the first well section based on the natural potential logging curve of the first well section to obtain a natural gamma logging curve of the first well section, wherein the natural potential logging curve is used for enhancing the characteristics of the initial natural gamma logging curve; Determining a shale content of the first wellbore section at a plurality of sampling depths based on the natural gamma log; and correcting the initial organic matter content of the sampling depth based on the clay content of the sampling depth for each sampling depth to obtain the target organic matter content of the sampling depth.
2. The method of claim 1, wherein the determining the shale content of the first wellbore section at a plurality of sampling depths based on the natural gamma log comprises: For each sampling depth, determining the argillaceous content of the sampling depth through a first corresponding relation based on the natural gamma value of the sampling depth and the natural gamma logging curve, wherein the first corresponding relation is the corresponding relation between the natural gamma value and the argillaceous content.
3. The method of claim 1, wherein the reconstructing the initial natural gamma log of the first interval based on the natural potential log of the first interval, prior to obtaining the natural gamma log of the first interval, further comprises at least one of: performing outlier processing on the natural potential logging curve; Baseline correction is carried out on the natural potential logging curve; and performing outlier processing on the initial natural gamma logging curve.
4. The method of claim 1, wherein for each sampling depth, correcting the initial organic content of the sampling depth based on the argillaceous content of the sampling depth to obtain the target organic content of the sampling depth comprises: for each sampling depth, outputting the product of the muddy content of the sampling depth and the initial organic matter content as the target organic matter content of the sampling depth.
5. The method of claim 1, wherein determining the initial organic content of the first interval at a plurality of sampling depths based on the resistivity log and the sonic moveout log of the first interval comprises: overlapping the resistivity log with the sonic moveout log; For each sampling depth, determining an amplitude difference between a logarithmic resistivity of the sampling depth and a sonic moveout; And determining the initial organic matter content of the sampling depth based on the amplitude difference and a second corresponding relation, wherein the second corresponding relation is the corresponding relation between the amplitude difference and the organic matter content.
6. The method of claim 5, wherein the method further comprises: obtaining the organic matter content of the second well section at a plurality of sampling depths; overlapping the resistivity log of the second wellbore section with the sonic moveout log; For each sampling depth of the second interval, determining an amplitude difference between a log resistivity of the sampling depth and a sonic moveout; And fitting based on the amplitude differences of the sampling depths of the second well section and the organic matter content to obtain the second corresponding relation.
7. A device for determining the content of organic matter, the device comprising: A determining module configured to determine an initial organic content of a first wellbore section at a plurality of sampling depths based on a resistivity log and a sonic moveout log of the first wellbore section, the resistivity log including a log resistivity at the plurality of sampling depths, the sonic moveout log including a sonic moveout at the plurality of sampling depths; The reconstruction module is used for reconstructing an initial natural gamma logging curve of the first well section based on the natural potential logging curve of the first well section to obtain a natural gamma logging curve of the first well section, wherein the natural potential logging curve is used for enhancing the characteristics of the initial natural gamma logging curve; The determining module is further configured to determine a shale content of the first well section at a plurality of sampling depths based on the natural gamma-ray log; and the correction module is used for correcting the initial organic matter content of each sampling depth based on the clay content of the sampling depth to obtain the target organic matter content of the sampling depth.
8. A computer device comprising one or more processors and one or more memories, the one or more memories having stored therein at least one program code loaded and executed by the one or more processors to implement the method of determining organic content as claimed in any of claims 1 to 6.
9. A computer readable storage medium having stored therein at least one program code, the at least one program code being loaded and executed by a processor to implement the method of determining organic matter content of any one of claims 1 to 6.
10. A computer program product, characterized in that the computer program product comprises a computer program code, which is stored in a computer readable storage medium, from which computer program code a processor of a computer device reads, which processor executes the computer program code, so that the computer device performs the method of determining the organic matter content according to any one of claims 1 to 6.

Description

Method and device for determining organic matter content, computer equipment and storage medium Technical Field The application relates to the technical field of petroleum and natural gas exploitation, in particular to a method and a device for determining organic matter content, computer equipment and a storage medium. Background In petroleum geology, the organic matter development stage generally refers to a stratum part rich in organic matters in stratum, and the organic matter development stage is generally present in oil shale and dark shale, and the content of the organic matters gradually decreases with the increase of the sand content. The organic matter development stage has high organic matter content and thus great significance in the production of hydrocarbon resource, such as petroleum, natural gas, etc. Logging techniques identify and evaluate these organic developmental stages by analyzing physical properties of the formation, such as resistivity, sonic velocity, density natural potential, natural gamma, etc. By analyzing the organic carbon content (TOC) of the sections, the hydrocarbon production potential of the sections can be estimated, and important basis is provided for oil and gas exploration. Therefore, how to determine the organic content of the organic developmental stage is important. Disclosure of Invention The embodiment of the application provides a method, a device, computer equipment and a storage medium for determining organic matter content, which can improve the accuracy of a geological map. The technical scheme is as follows: In one aspect, a method for determining an organic matter content is provided, the method comprising: Determining an initial organic content of a first wellbore interval at a plurality of sampling depths based on a resistivity log and a sonic moveout log of the first wellbore interval, the resistivity log comprising a log resistivity at the plurality of sampling depths, the sonic moveout log comprising a sonic moveout at the plurality of sampling depths; Reconstructing an initial natural gamma logging curve of the first well section based on the natural potential logging curve of the first well section to obtain a natural gamma logging curve of the first well section, wherein the natural potential logging curve is used for enhancing the characteristics of the initial natural gamma logging curve; Determining a shale content of the first wellbore section at a plurality of sampling depths based on the natural gamma log; and correcting the initial organic matter content of the sampling depth based on the clay content of the sampling depth for each sampling depth to obtain the target organic matter content of the sampling depth. In some embodiments, the determining the shale content of the first wellbore section at a plurality of sampling depths based on the natural gamma log comprises: For each sampling depth, determining the argillaceous content of the sampling depth through a first corresponding relation based on the natural gamma value of the sampling depth and the natural gamma logging curve, wherein the first corresponding relation is the corresponding relation between the natural gamma value and the argillaceous content. In some embodiments, the reconstructing the initial natural gamma log of the first well section based on the natural potential log of the first well section, before obtaining the natural gamma log of the first well section, further comprises at least one of: performing outlier processing on the natural potential logging curve; Baseline correction is carried out on the natural potential logging curve; and performing outlier processing on the initial natural gamma logging curve. In some embodiments, for each sampling depth, correcting the initial organic content of the sampling depth based on the clay content of the sampling depth to obtain a target organic content of the sampling depth includes: for each sampling depth, outputting the product of the muddy content of the sampling depth and the initial organic matter content as the target organic matter content of the sampling depth. In some embodiments, the determining the initial organic content of the first interval at a plurality of sampling depths based on the resistivity log and the sonic moveout log of the first interval comprises: overlapping the resistivity log with the sonic moveout log; For each sampling depth, determining an amplitude difference between a logarithmic resistivity of the sampling depth and a sonic moveout; And determining the initial organic matter content of the sampling depth based on the amplitude difference and a second corresponding relation, wherein the second corresponding relation is the corresponding relation between the amplitude difference and the organic matter content. In some embodiments, the method further comprises: obtaining the organic matter content of the second well section at a plurality of sampling depths; overlapping the resistivity lo