Crack parameter prediction method and system based on post-stack data
A prediction method and technology of a prediction system, applied in the field of seismic exploration, can solve problems such as low quality gathers and large amount of calculation in prestack gathers
Active Publication Date: 2021-04-13
CHINA PETROLEUM & CHEM CORP +1
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[0004] The present invention proposes a fracture parameter prediction method and system based on post-stack data, which can conduct anisotropic inversion of azimuthal fractures for post-stack seismic data, and develop fracture anisotropy stably, quickly and with high signal-to-noise ratio. Anisotropy prediction, which solves the problem of large amount of calculation in pre-stack gathers and low quality of gathers
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[0025] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
[0026] figure 1 A flowchart showing the steps of the fracture parameter prediction method based on post-stack data according to the present invention.
[0027] In this embodiment, the fracture parameter prediction method based on post-stack data according to the present invention may include: Step 101, according to the post-stack seismic data, establish a common-depth point coordinate axis for the common-depth point gather; In the point coordinate axis, determine the azimuth and dist...
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The invention discloses a crack parameter prediction method and system based on post-stack data. The method comprises the following steps: establishing a common depth point coordinate axis for a common depth point gather according to post-stack seismic data; determining azimuth angles and distances of the plurality of calculation points relative to the target point in the common depth point coordinate axis; calculating crack attributes of the post-stack seismic data; and according to the azimuth angles and distances of the multiple calculation points relative to the target point, performing ellipse simulation on the crack attributes, and calculating crack parameters. Azimuth crack anisotropy inversion is carried out on the post-stack seismic data, crack anisotropy prediction is carried out stably and quickly with a high signal-to-noise ratio, and the problems of large calculation amount and low trace gather quality in a pre-stack trace gather are solved.
Description
technical field [0001] The present invention relates to the field of seismic exploration, more specifically, to a fracture parameter prediction method and system based on post-stack data. Background technique [0002] In recent years, a variety of methods and technologies have been developed for the identification and description of fractured oil and gas reservoirs. Using post-stack seismic data to carry out fracture prediction includes edge detection, intrinsic coherence, curvature, ant body and other post-stack attribute technologies; using pre-stack gathers Develop fracture prediction technology, mainly including azimuthal anisotropy inversion technology, etc. The existing anisotropy inversion of pre-stack fractures is based on the pre-stack azimuth incident angle (or offset) gathers. A series of problems such as low signal-to-noise ratio of data and wavelet stretching. Therefore, it is necessary to develop a fracture parameter prediction method and system based on post...
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IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/306G01V1/362G01V2210/514G01V2210/624
Inventor 梁志强
Owner CHINA PETROLEUM & CHEM CORP