Pre-pressing solid medium seismic wave propagation finite difference simulation method

Abstract

The invention discloses a prepressing fixed medium seismic wave propagation finite difference simulation method, which comprises the following steps of: 1) describing a wave propagation condition under a prepressing solid condition by utilizing an acoustic elasticity technology to describe an elastic wave propagation equation under a prepressing stress environment; 2) establishing a uniform layered medium model by using a known rock elastic modulus; 3) differentiating the elastic wave propagation equation by using a rotary staggered grid finite difference method; 4) applying a non-split convolution complete matching layer to the boundary of the uniform layered medium model in the step 2) to absorb the boundary; 5) carrying out acoustic elasticity simulation on the uniform layered medium model by using a rotary staggered grid finite difference method under different stress field conditions, and checking simulation precision; and (6) establishing a double-layer medium model, repeating the steps (3)-(5), and carrying out prepressing solid medium seismic wave propagation finite difference simulation 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...

AI Technical Summary

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

Images