CN-121995483-A - Fracture reconstruction method, system, equipment and medium for fracture of fracture-controlled carbonate rock stratum based on spectral clustering algorithm

CN121995483ACN 121995483 ACN121995483 ACN 121995483ACN-121995483-A

Abstract

The invention provides a fracture reconstruction method, a system, equipment and a medium for a fracture of a fracture-controlled carbonate rock stratum based on a spectral clustering algorithm, which comprise the following steps of 1, acquiring seismic volume data of a target area; step 2, processing the obtained seismic volume data by using a spectral clustering algorithm to obtain a cluster division result; and 3, connecting each cluster point set in the cluster division result by taking the azimuth angle of the seismic exploration crack in the seismic volume data as a constraint, and reconstructing to obtain the fracture zone associated crack of the fracture zone of the fracture-controlled carbonate stratum.

Inventors

DENG XINGLIANG
ZHANG JIE
WANG PENG
LI GUOHUI
LIU ZHILIANG
WANG PENG
JIANG QIONG

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241108

Claims (10)

1. A fracture reconstruction method of a fracture of a disconnected control type carbonate stratum based on a spectral clustering algorithm is characterized by comprising the following steps: Step 1, acquiring seismic volume data of a target area; step 2, processing the obtained seismic volume data by using a spectral clustering algorithm to obtain a cluster division result; And 3, connecting each cluster point set in the cluster division result by taking the azimuth angle of the seismic exploration crack in the seismic volume data as constraint, and reconstructing to obtain the fracture zone associated crack of the sliding of the fracture zone of the fracture-controlled carbonate stratum.
2. The method for reconstructing the fracture of the disconnected control type carbonate stratum based on the spectral clustering algorithm according to claim 1, wherein in the step 2, the obtained seismic volume data is processed by using the spectral clustering algorithm to obtain a cluster division result, and the specific method is as follows: S21, calculating to obtain a Laplace matrix by utilizing the seismic volume data of the target area; s22, constructing a standardized Laplace matrix; s23, calculating feature vectors corresponding to k1 minimum feature values in the standardized Laplace matrix; s24, forming a matrix by the obtained feature vectors, and standardizing the obtained matrix according to rows to obtain a new matrix; S25, taking each row in the new matrix as one sample to obtain a plurality of samples; S26, clustering the obtained multiple samples to obtain a cluster division result.
3. The method for reconstructing the fracture of the disconnected control type carbonate stratum based on the spectral clustering algorithm according to claim 2, wherein in S21, a laplace matrix is calculated by using seismic volume data of a target area, and the specific method comprises the following steps: respectively constructing an adjacency matrix and a degree matrix by utilizing seismic volume data of a target area; and calculating to obtain the Laplace matrix according to the obtained adjacency matrix and the degree matrix.
4. The method for reconstructing the fracture of the disconnected control type carbonate stratum based on the spectral clustering algorithm, which is characterized by respectively constructing an adjacency matrix and a degree matrix by utilizing seismic volume data of a target area, comprises the following specific steps of: importing PETREL software into the obtained seismic volume data of the target area to construct a seismic interpretation model diagram; converting the format of the seismic interpretation model diagram by utilizing NetworkX library to obtain a converted data sample; constructing the converted data sample by combining a full connection method to obtain an adjacent matrix; And constructing a degree matrix by using the converted data samples.
5. The method for reconstructing the fracture of the controlled-release carbonate stratum based on the spectral clustering algorithm according to claim 4, wherein the kernel function of the fully-connected method is a polynomial kernel function, a Gaussian kernel function or a sigmoid kernel function.
6. The method for reconstructing the fracture of the disconnected control type carbonate stratum based on the spectral clustering algorithm is characterized in that in the step 3, each cluster point set in a cluster division result is connected by taking the azimuth angle of the seismic exploration fracture in seismic volume data as a constraint, and the fracture zone associated fracture of the disconnected control type carbonate stratum is reconstructed, and the method specifically comprises the following steps: S31, calculating the inclination angle between the connecting line between a certain point in each cluster point set and the closest point and the north direction; S32, judging whether the inclination angle meets the range of the setting of the azimuth angle of the earthquake crack, wherein if so, connecting a certain point with the nearest point, entering S33, otherwise, excluding the point and entering S34; s33, selecting one point from the rest points, calculating the inclination angle between the connecting line between the selected point and the nearest point and the north direction, and entering S32; s34, selecting a point closest to the certain point from the rest points, calculating the inclination angle between the connecting line between the two points and the north direction, and entering S32.
7. A fracture reconstruction system of a fracture-controlled carbonate rock stratum based on a spectral clustering algorithm is characterized by comprising the following steps: the seismic volume data acquisition unit is used for acquiring seismic volume data of the target area; the data clustering unit is used for processing the obtained seismic volume data by utilizing a spectral clustering algorithm to obtain a cluster division result; and the crack reconstruction unit is used for connecting each cluster point set in the cluster division result by taking the azimuth angle of the seismic exploration crack in the seismic volume data as constraint, and reconstructing to obtain the fracture zone associated crack of the sliding of the fracture zone of the fracture-controlled carbonate stratum.
8. A computer device, comprising: A processor adapted to execute a computer program; A computer readable storage medium having stored therein a computer program which, when executed by the processor, performs the method of any of claims 1 to 6.
9. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the method according to any one of claims 1 to 6.
10. A computer program product, characterized in that the computer program product comprises a computer program which, when executed by a processor, implements the method according to any of claims 1 to 6.

Description

Fracture reconstruction method, system, equipment and medium for fracture of fracture-controlled carbonate rock stratum based on spectral clustering algorithm Technical Field The invention belongs to the technical field of petroleum and natural gas exploitation, and particularly relates to a fracture reconstruction method, a system, equipment and a medium for a fracture of a fracture-controlled carbonate rock stratum based on a spectral clustering algorithm. Background The disconnected control type carbonate reservoir is an important component part in a Tarim oil field and a Tahe oil field carbonate reservoir. The storage and seepage space of the disconnected control type carbonate rock is different from that of sandstone, cracks, karst cave and the like are used as main storage and seepage spaces of the disconnected control type carbonate rock, and the primary pore development is less through later-stage transformation. For the disconnected control type carbonate rock oil and gas reservoir, the former has accumulated abundant and precious experience in exploration and development, and has also achieved great breakthrough and success. With the continuous promotion of natural gas energy demand and the progress of various key link technologies of the exploration and development of the disconnected control type carbonate rock gas reservoir, the exploration and development of the complicated and hidden disconnected control type carbonate rock gas reservoir which is difficult to reach and reach in the past have been successful, and the exploration and development of the disconnected control type carbonate rock gas reservoir at home and abroad has a trend of increasing year by year. The Tarim basin Olympic eagle mountain group reservoir is formed by controlling sliding fracture during multi-stage construction movement, and the modified reservoir is subjected to top precipitation corrosion and bottom hydrothermal corrosion, has the characteristic of strong communication, and the sliding fracture and accompanying cracks are main factors for reservoir formation and control, so that accurate characterization of the sliding fracture and accompanying cracks is key for fine description of the broken control carbonate reservoir. The sliding fracture zone forms multi-scale cracks due to multi-stage structural stress action, has complex forms, and even forms a complex crack network in a strong stress action area, and the connection relationship among the cracks is netlike. It is particularly important how to scientifically make a description of the associated cracks of the sliding fracture zone. Because the fracture-control type carbonate stratum sliding fracture zone associated fracture morphology is complex, the current industry software fracture extraction method has poor output result precision, can not well restore the seismic fracture attribute morphology, and has the distortion problem. Disclosure of Invention The invention aims to provide a fracture reconstruction method, a system, equipment and a medium for a fracture of a fracture-controlled carbonate stratum based on a spectral clustering algorithm, which solve the defect that the existing fracture characterization of the fracture zone of the fracture-controlled carbonate stratum is distorted. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a fracture reconstruction method of a fracture-controlled carbonate rock stratum based on a spectral clustering algorithm, which comprises the following steps: Step 1, acquiring seismic volume data of a target area; step 2, processing the obtained seismic volume data by using a spectral clustering algorithm to obtain a cluster division result; And 3, connecting each cluster point set in the cluster division result by taking the azimuth angle of the seismic exploration crack in the seismic volume data as constraint, and reconstructing to obtain the fracture zone associated crack of the sliding of the fracture zone of the fracture-controlled carbonate stratum. Preferably, in step 2, the obtained seismic volume data is processed by using a spectral clustering algorithm to obtain a cluster division result, and the specific method is as follows: S21, calculating to obtain a Laplace matrix by utilizing the seismic volume data of the target area; s22, constructing a standardized Laplace matrix; s23, calculating feature vectors corresponding to k1 minimum feature values in the standardized Laplace matrix; s24, forming a matrix by the obtained feature vectors, and standardizing the obtained matrix according to rows to obtain a new matrix; S25, taking each row in the new matrix as one sample to obtain a plurality of samples; S26, clustering the obtained multiple samples to obtain a cluster division result. Preferably, in S21, the laplace matrix is calculated by using the seismic volume data of the target area, and the specific method is as follows: respectively construc