An anisotropic fluid identification factor inversion method and system

Abstract

The invention discloses an anisotropic fluid identification factor inversion method and system, relating to the technical field of geophysical inversion. With post-stack azimuth data as a base, the accuracy and reliability of an inversion result are improved. According to the embodiment of the invention, through selecting different azimuth angles, the selected pre-stack data of the azimuth angles are stacked according to an incident angle direction, the post-stack seismic data corresponding to each azimuth angle is subjected to inversion, and the reflection coefficient corresponding to each azimuth is obtained. A pre-stack azimuth angle gather is analyzed to obtain incident angle information, and an intermediate parameter is calculated according to the incident angle information. According to the three selected different azimuth angles, the reflection coefficient obtained through the inversion and the calculation intermediate parameter, an anisotropic parameter and variable are obtained through calculation. According to the anisotropic parameter and variable, an anisotropic fluid identification factor is obtained through calculation. The scheme provided by the embodiment of the invention is suitable for the analysis of the properties of a filling fluid in a crack and crack prediction.

Description

technical field [0001] The invention relates to the field of geophysical inversion, in particular to an anisotropic fluid identification factor inversion method and system. Background technique [0002] As the degree of exploration deepens, it is required to evaluate the fluid-bearing conditions in fractures in the evaluation of fractured reservoirs. At present, because fracture anisotropy parameters are difficult to obtain, most studies are based on Ruger's simplification to obtain approximate solutions of fluid identification factors. [0003] However, using Ruger's simplified method, it is easy to introduce more errors into the approximate solution of the fluid identification factor obtained, and based on the principle of pre-stack inversion and the direct influence of pre-stack data, the accuracy and reliability of the inversion results Reliability is greatly reduced. Contents of the invention [0004] The embodiment of the present invention provides an anisotropic f...

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Problems solved by technology

[0003] However, using Ruger's simplified method, it is easy to introduce more errors into the approximate solution of the fluid identification factor obtained, and based on the principle of pre-stack inversion and the direct influence of pre-stack data, the accuracy and reliability of the inversion results Reliability is greatly reduced

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