Anisotropy characterization method and anisotropy characterization system based on all-direction common imaging point gather

Abstract

The invention provides an anisotropy characterization method and an anisotropy characterization system based on an all-direction common imaging point gather. The method comprises the following steps: acquiring the all-direction common imaging point gather stored in an azimuth angle-offset distance domain data regularization format; determining the anisotropy strength on the all-direction common imaging point gather; determining an azimuthal anisotropy relative coefficient on the all-direction common imaging point gather; determining an azimuthal anisotropy coefficient according to the anisotropy strength and the azimuthal anisotropy relative coefficient; drawing a rose diagram according to the azimuthal anisotropy coefficient. Aiming at the all-direction common imaging point gather for azimuth angle processing, an anisotropy rose diagram is made based on gather horizon energy attributes or time difference attributes in order to characterize the anisotropy strength in any direction.

Description

technical field [0001] The present invention relates to the technical field of geophysical exploration, in particular to an anisotropic data processing technology based on two-width-one-height seismic data acquisition and omnidirectional co-imaging point gathers, specifically an anisotropic data processing technology based on omnidirectional co-imaging Anisotropic representation method and system for point gathers. Background technique [0002] In the prior art, conventional geophysical methods mainly rely on sub-azimuth pre-stack time migration to obtain sub-azimuth migration profiles when characterizing formation anisotropy, and extract the same attribute parameters respectively, and use sub-azimuth attribute parameters to fit Anisotropic ellipse, using the major axis of the ellipse to identify the orientation of the anisotropy. [0003] The above-mentioned conventional processing method has great limitations, and its main limitation is that the number of azimuth angle di...

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Problems solved by technology

[0005] In order to overcome the low accuracy of anisotropic azimuth caused by the limited number of azimuth angle divisions in the conventional processing method in the prior art, and the method of fitting ellipse can only be used to identify a single group of underground fractures in theory. The technical problem of not being able to identify two groups of fractures or multiple groups of fracture development areas, the present invention provides an anisotropy characterization method and system based on omnidirectional common imaging point gathers, aiming at the azimuth-offset domain The omnidirectional angle co-imaging point gathers stored in a regularized format of the data, the anisotropy intensity and the relative coefficient of azimuth anisotropy are determined along the layer, based on the energy attribute or time difference attribute of the gather along the layer, an anisotropic rose diagram is made to realize anisotropic strength in any orientation

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