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

A technology of finite difference and simulation method, which is applied in the field of seismic exploration, can solve the problems that the real deep reservoir structure cannot be obtained, the seismic section cannot be obtained, and the propagation of the medium is not considered, so as to simplify the amount of calculation and complexity, and clear cognition , the effect of effective absorption effect

Active Publication Date: 2021-06-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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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 fo

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

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[0081] The present invention will be described in detail below with reference to the accompanying drawings and examples. However, it should be understood that the accompanying drawings will not be better understood by the invention, and they should not be understood to be limited to the present invention.

[0082] Such as figure 1 As shown, a finite difference simulation method for seismic wave propagation of a preloaded fixed medium according to an embodiment of the present disclosure includes the following steps:

[0083] 1) Using acoustic elastic technology to describe the elastic wave propagation equation (ie, sound elastic equation), and combined with rock physics experiments to verify the correctness of the sound elasticity, describe the propagation of the wave of the preload solid condition;

[0084] The elastic wave propagation equation is as follows:

[0085]

[0086] Among the formulas αβγδ Indicates the fourth-order stiffness tub, u represents the displacement compone...

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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...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/30
Inventor 符力耘杨海迪付博烨
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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