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Numerical Simulation Method of Seismic Wavefield in 3D tti Two-Phase Media Based on Finite Difference Method

A finite difference method and seismic wave field technology, applied in the field of seismic exploration, can solve problems such as the inability to describe the wave propagation process well, and achieve the effect of real-time propagation simulation

Active Publication Date: 2017-10-27
北京多分量地震技术研究院
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Problems solved by technology

Practice has found that the classical model of tight media cannot describe the wave propagation process in the oil layer well, and it needs to be improved

Method used

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  • Numerical Simulation Method of Seismic Wavefield in 3D tti Two-Phase Media Based on Finite Difference Method
  • Numerical Simulation Method of Seismic Wavefield in 3D tti Two-Phase Media Based on Finite Difference Method
  • Numerical Simulation Method of Seismic Wavefield in 3D tti Two-Phase Media Based on Finite Difference Method

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Embodiment Construction

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] The dual-phase medium theory holds that the underground medium is composed of solid and fluid. The solid is the skeleton of the rock, and the fluid is the liquid or gas that fills the pores and fractures of the skeleton. When more than two fluids are contained in pores and fractures, it is also called a multiphase medium. When seismic waves propagate in rocks composed of solid and liquid phases or solid and gas phases, their propagation laws are different from those in single-phase media. Due to the interaction between solid medium and fluid medium, the propagation law of seismic wave in two-phase medium becomes more complex. For convenience, when studying two-phase media, the physical and chemical interactions between solids and ...

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Abstract

The invention discloses a three-dimensional TTI two-phase medium seismic wave field numerical simulation method based on the finite difference method, wherein the method includes obtaining solid and fluid stress tensors, solid and fluid strain tensors, and converting them into constitutive equations; according to the stress According to the corresponding relationship with the displacement, the geometric equation is obtained; according to the constitutive, geometric equation, the motion of the fluid relative to the solid, and the corresponding relationship between the stress and the displacement, the differential equation of motion is obtained; the divergence of both sides of the differential equation of motion is obtained to obtain the first seismic wave and the second longitudinal wave equation; for the first and second longitudinal wave equations, the partial derivative with respect to y is equal to zero, and the 2N-order precision expansion and the second-order precision central difference scheme are used for the differential dispersion of the space partial derivative and time partial derivative, and the first The first and second differential equations; the first and second differential equations are subjected to absorbing boundary conditions to obtain corresponding seismic wave field values. Through the invention, the real-time propagation simulation of the physical seismic wave field can be realized.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a combined AVO inversion method of PP waves and PS waves using average incident angle gathers. Background technique [0002] Oil and natural gas are indispensable and important energy sources for economic construction and human life. The supply of oil and gas directly affects the pace of economic development and people's living standards in countries all over the world. and the primary goal of geologists. my country has become an oil importing country since 1993, and the import volume has increased year by year. How to get rid of the national economy's dependence on oil and gas imports and increase domestic oil and gas production is the main task facing my country's oil and gas industry. [0003] The increase of oil and gas production is based on the increase of new oil and gas reserves and remaining oil reserves ascertained by geological exploration, which requires ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 张会星王赟
Owner 北京多分量地震技术研究院
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