Method and device for determining microfractures
A determination method and area determination technology, applied in the field of geophysical exploration, can solve the problems of large micro-fracture errors and poor accuracy, and achieve the effect of precise determination and improved identification
Active Publication Date: 2020-07-10
BC P INC CHINA NAT PETROLEUM CORP +1
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[0005] The embodiment of the present application provides a method and device for determining micro-fractures to solve the technical problems of large errors and poor accuracy in determining micro-fractures existing in existing methods, and achieve the technical effect of accurately determining micro-fractures
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[0055] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0056]Considering the existing technology, in specific implementation, after the curvature data volume of the target area is calculated, the characteristic changes of the stratum structure in the target area (such as the degree of curvature, etc.) are directly analyzed according to the curvature data volume of the target area. Characteristic ...
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The embodiment of the application provides a determination method and device of a micro-fracture. The method comprises the following steps: acquiring post-stack seismic data of a target region; determining a curvature data volume of the target region according to the post-stack seismic data; computing a self-related function of a seismic trace in the target region according to the curvature data volume of the target region; determining the micro-fracture of the target region according to the self-related function of the seismic trace; since the advantages of the curvature data volume and the coherent technology on the micro-fracture identification are comprehensively considered, the self-related function of the seismic trace is computed by using the above curvature data volume based on a related mechanism of the coherent technology after computing the curvature data volume of the target region, and then the micro-fracture is identified and determined according to the angle of the self-related function of the seismic trace from the energy change, thereby solving the technical problem that the determined micro-fracture is large in error and bad in accuracy in the existing method, anda technical effect of efficiently and precisely determining the micro-fracture is achieved.
Description
technical field [0001] The present application relates to the technical field of geophysical exploration, in particular to a method and device for determining micro-fractures. Background technique [0002] In seismic exploration, it is often necessary to identify and determine the micro-fractures in the target area. Among them, the above-mentioned micro-fractures can be specifically understood as a fault structure (may be called a micro-fault), which can be used as a storage space and / or seepage channel for low-porosity and low-permeability reservoirs, and has a great impact on oil and gas migration and accumulation. Tibet plays an important role. Generally, the above-mentioned micro-fractures refer to faults with a fault throw less than 8 ms in the region. Specifically, there is often no obvious dislocation of the reflection isotropic axis in earthquakes, which is manifested by energy changes such as local disturbances, folds, or sudden weakening of amplitude. [0003] At...
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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 田爽于志龙柴巧英孙庭斌姜宏宇
Owner BC P INC CHINA NAT PETROLEUM CORP