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High-pressure medium seismic wave propagation simulation method

A technology of propagation simulation and high-pressure medium, which is applied in the field of seismic exploration and can solve the problems that the influence of rock elastic properties is not considered

Active Publication Date: 2018-12-28
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] However, the current acoustoelastic theory mainly studies the change of the crystal lattice potential energy inside the rock, and the influence of the relative position of the particles inside the rock and the change of the pore structure on the elastic properties of the rock is not considered.

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Embodiment Construction

[0043] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0044] The present invention proposes a high-pressure medium seismic wave propagation simulation method, comprising the following steps:

[0045] 1) Establish a new type of acoustoelastic formula combined with pore structure parameters, as follows:

[0046]

[0047] In the formula, ρ is the density of the rock, V p and V s is the equivalent rock velocity of compressional and shear waves. L drs and μ drs is the compression and shear modulus of dry rock when the soft pores are closed, K drs is the bulk modulus of dry rock when the soft pores are closed. and is the third-order elastic constant of rock closed in soft pores, and P is the effective pressure of the rock's environment. φ c0 is the porosity of soft pores inside the rock, θ c , θ cL , θ cμ , and θ cK Both are quantities related to the soft pore geometry, θ c represents the ...

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Abstract

The invention relates to a high-pressure medium seismic wave propagation simulation method, comprising the following steps: 1) establishing a novel acoustic elasticity formula combined with pore structural parameters; 2) calculating equivalent elastic moduli and elastic wave velocities in different pressure states by utilizing the novel acoustic elasticity formula; 3) extracting structured data, namely autocorrelation length, among particles inside rocks; 4) specific to each pressure state, taking the equivalent elastic moduli obtained by the step 2) as background values of rock medium elasticmoduli respectively, and according the autocorrelation length extracted in the step 3), by combining an autocorrelation function, adding elastic modulus disturbance in the background values, and building a rock numerical value model in each pressure state; and 5) performing finite element seismic wave field simulation in each rock numerical value model, and extracting a scattering attenuation Qc-1 value of a reservoir specific to characteristics of a deep reservoir, wherein Qc-1 is a coda wave attenuation coefficient.

Description

technical field [0001] The invention relates to a high-pressure medium seismic wave propagation simulation method, which belongs to the technical field of seismic exploration. Background technique [0002] With the deepening of seismic exploration technology research, seismic exploration has gradually changed from shallow oil and gas reservoir exploration to deep oil and gas reservoirs and complex structural oil and gas reservoirs. Deep and complex structural reservoirs are greatly affected by the surrounding environmental pressure and stress. Deep reservoirs The dynamic mechanical parameters are completely different from those in the shallow state. For seismic exploration of deep reservoirs, the reservoir physical properties are complex and the reflection signals are weak. Information identifying reservoir characteristics. Deep reservoir rocks are seriously affected by pressure and complex stress. Conventional seismic fluctuation theory does not consider the impact of env...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 符力耘付博烨魏伟孙伟家
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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