An Anisotropic Parameter Inversion Method Based on Transmission Equation

Abstract

The invention provides an anisotropic parameter inversion method based on a transmission equation, which belongs to the field of geophysical inversion. The method includes: (1) selecting post-stack seismic data volumes corresponding to any three different azimuth angles, calculating the reflection coefficients corresponding to the three different azimuth angles through sparse pulse inversion method; (2) calculating three different azimuth angles respectively. The transmission coefficient corresponding to the reflection coefficient of the azimuth angle (3) analyze the pre-stack azimuth gather to obtain the incident angle information, the incident angle information includes the maximum incident angle i2, the minimum incident angle i1 and the interval; (4) use the azimuth information transmission coefficient The information is calculated to obtain the anisotropy parameters Δε(V) and Δδ(V).

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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