An Anisotropic Parameter Inversion Method Based on Basis Tracing Transverse Multi-Trace Constraints

Abstract

The invention discloses an anisotropic parameter inversion method based on base tracing lateral multi-channel constraints, including: processing seismic data, obtaining azimuth and angle stacking gathers; constructing a petrophysical model, obtaining fracture parameter logging data; The log data is de-correlated; the inversion objective function is constructed; based on the inversion objective function, the reflection coefficient sequence of the parameter to be inverted is obtained. The anisotropic parameter inversion method based on the base tracing lateral multi-trace constraint of the present invention obtains the azimuth angle stacked gather by incorporating the azimuth angle, the channel ratio of the azimuth angle stacked gather is high, and includes multiple seismic information, and more accurately Provide fracture information in the reservoir, improve the accuracy of the inversion results by decorrelating the logging data, and construct the inversion objective function by adding relevant constraints to the objective function, which improves the stability of the inversion results And horizontal continuity, so as to reduce the uncertainty of unknown parameter estimation.

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 basis tracing transverse multi-track constraints. Background technique [0002] As exploration targets shift to complex oil and gas reservoirs, unconventional oil and gas exploration and development has become a research focus. In the exploration of shale gas, it is very important to effectively identify the degree of fracture development, and fractured reservoirs have anisotropic characteristics. is of great significance. [0003] With the rapid development of wide-azimuth seismic data acquisition and processing technology, the use of wide-azimuth pre-stack seismic data to predict subsurface fractures has become a major research method. At present, the anisotropic parameter inversion method based on azimuthal prestack seismic data mainly uses the variation of reflection coefficient with incident angle and azimu...

AI Technical Summary

Problems solved by technology

At present, the anisotropic parameter inversion method based on azimuthal prestack seismic data mainly uses the variation of reflection coefficient with incident angle and azimuth angle during the propagation of seismic waves in fractured reservoirs to study, and the theoretical derivation mainly comes from Ruger in 1998 The approximate formula of the reflection coefficient based on the equivalent transverse isotropic medium was proposed in 1999. Afterwards, some relevant scholars made a series of simplifications to the equation, but there are still problems of reliability and stability in the inversion of anisotropic parameters.

In addition, the anisotropic characteristics of fractured reservoirs affect the amplitude of seismic waves, resulting in lateral discontinuity in the inversion process.

Images