Anisotropy parameter inversion method based on transmission equation

Abstract

The invention provides an anisotropy parameter inversion method based on a transmission equation, and belongs to the field of physical geography inversion. The method comprises the steps: (1) selecting post-stack seismic data volumes corresponding to any three different azimuth angles, calculating and obtaining reflection coefficients corresponding to the three different azimuth angles through employing a sparse pulse inversion method; (2) respectively calculating transmission coefficients corresponding to the three reflection coefficients; (3) analyzing a pre-stack azimuth path set, and obtaining incident angle information, wherein the incident angle information comprises a maximum incident angle i2, a maximum incident angle i1, and an interval; (4) calculating and obtaining anisotropy parameters delta epsilon (V) and delta delta (V) through the azimuth angle information and the transmission coefficient information.

Description

technical field [0001] The invention belongs to the field of geophysical inversion, and in particular relates to an anisotropic parameter inversion method based on a transmission equation. Background technique [0002] Anisotropy parameters play a pivotal role in the quantitative prediction of fractures, but because the order of magnitude of anisotropy parameters is much smaller than that of seismic data, its calculation has brought great difficulties. At present, the calculation of anisotropy parameters is mainly based on prestack azimuth gathers, which are mainly divided into the following three types of channels: 1. According to the velocity information that changes with the seismic azimuth, the accuracy of velocity analysis is difficult to meet the needs of the method; 2. According to the velocity information that varies with the seismic azimuth The remaining time difference information, there are many errors when picking up the remaining time difference; 3. Based on the...

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Problems solved by technology

[0002] Anisotropy parameters play a pivotal role in the quantitative prediction of fractures, but because the order of magnitude of anisotropy parameters is much smaller than that of seismic data, it brings great difficulties to its calculation

At present, the calculation of anisotropy parameters is mainly based on prestack azimuth gathers, which are mainly divided into the following three types of channels: 1. According to the velocity information that changes with the seismic azimuth, the accuracy of velocity analysis is difficult to meet the needs of the method; 2. According to the velocity information that varies with the seismic azimuth The remaining time difference information, there are many errors when picking up the remaining time difference; 3. Based on the simplified Ruger (1998) equation (the solution of the unsimplified or approximate Ruger equation cannot be calculated, and the simplified equation or some approximate relationship must be used Simplify Ruger's equation to get the solution of Ruger's equation

And the Ruger equation used in the existing method is the Ruger reflection coefficient equation, not the Ruger transmission equation), based on the inversion of elastic parameters under various assumptions, although the research shows that the simplified Ruger equation has little effect on the calculation of the reflection coefficient, However, the resulting transmission error has a huge influence on the calculation of anisotropy parameters with extremely small orders of magnitude.

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