A Finite-Difference Simulation Method for Seismic Wave Propagation in Precompressed Solid Media

Abstract

The invention discloses a finite difference simulation method for seismic wave propagation in a pre-compressed fixed medium, which comprises the following steps: 1) using the elastic wave propagation equation described in the pre-compressed stress environment in the acoustoelastic technology to describe the wave propagation under the pre-compressed solid condition 2) Using the known elastic modulus of the rock, a uniform layered medium model is established; 3) Differential elastic wave propagation equations are used by the rotating staggered grid finite difference method; 4) The boundary of the uniform layered medium model in step 2) Apply unsplit convolution to perfectly match the layer absorption boundary; 5) Under different stress field conditions, use the rotating staggered grid finite difference method to perform acoustoelastic simulation on the uniform layered medium model, and verify the simulation accuracy; 6) Establish a double-layer medium model, Repeat steps 3)-5) to perform finite-difference simulation of seismic wave propagation in precompressed solid media to obtain seismic wave fields under different stress fields.

Description

technical field [0001] The invention relates to a finite difference simulation method for seismic wave propagation in a pre-compressed solid medium, belonging to the field of seismic exploration. Background technique [0002] With the continuous development of the field of seismic exploration, the development of oil and gas reservoirs is no longer limited to the shallow part, and seismic exploration technology is gradually shifting to the direction of deep oil and gas reservoirs and complex structural oil and gas reservoirs. The deep and complex structural reservoirs are greatly affected by the surrounding environmental pressure and stress, and the dynamic mechanical parameters of the deep reservoirs are completely different from those of the shallow ones. The rock medium in deep reservoirs will be affected by strong formation pressure or even complex stress. The conventional theory of seismic wave elasticity assumes that the medium is subjected to infinitesimal stress, and...

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Problems solved by technology

The conventional theory of seismic wave elasticity assumes that the medium is subjected to infinitesimal stress, and the theory of wave propagation in the medium does not consider the propagation of the medium under the conditions of large formation pressure and complex stress, so that the traditional exploration seismology method cannot obtain the true depth. reservoir structure, and it is impossible to obtain a seismic section that truly reflects the deep underground structure

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