3D TTI double-phase medium seismic wave field value simulation method 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: 2015-11-11
北京多分量地震技术研究院
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Practice has found that the classical model of tight media cannot describe th

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  • 3D TTI double-phase medium seismic wave field value simulation method based on finite difference method
  • 3D TTI double-phase medium seismic wave field value simulation method based on finite difference method
  • 3D TTI double-phase medium seismic wave field value simulation method based on finite difference method

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[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 3D TTI double-phase medium seismic wave field value simulation method based on a finite difference method. The 3D TTI double-phase medium seismic wave field value simulation method comprises steps of obtaining a solid and fluid stress tensor and a solid and flow strain tensor and transforming the tensors to a constitutive equation, obtaining a geometry equation according to the corresponding relation of stress and the displacement, obtaining a motion differential equation according to the constitutive equation, the geometry equation and the fluid motion relative to the solid and the corresponding relation between the stress and the displacement, taking the divergence on two ends of the motion differential equation to obtain a first longitudinal wave equation and a second longitudinal wave equation of the seismic wave, as for the first longitudinal wave equation and the second longitudinal equation, enabling a partial derivative to y to be zero and performing difference discrete on the space partial derivative and the time partial derivative by employing an 2N order precision expansion formula and a 2-order precision center difference form to obtain a first difference equation and a second difference equation, and performing boundary absorbing condition processing on the first difference equation and the second difference equation to obtain the corresponding seismic wave field value. The invention realizes the real-time transmission simulation of the physics seismic wave field.

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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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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