Pure P-wave anisotropic wave field simulation method

An anisotropic and wave field simulation technology, applied in seismic wave reverse time migration imaging, pure longitudinal wave anisotropy wave field simulation field, can solve problems such as finite difference simulation stability problem, SV wave noise, etc., to solve instability Problems, Effects of Noise Cancellation

Inactive Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0024] The purpose of the present invention is to solve the stability problem of finite difference simulation and the elimination of SV wave noise in the above-mentioned prior art, provide a pure longitudinal wave anisotropic wave field simulation method, and realize seismic wave reverse time migration imaging

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[0047] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0048] The invention is a longitudinal wave simulation method in an anisotropic medium, and is applied in reverse time migration imaging technology, which can provide powerful technical means for seismic exploration. On the basis of the prior art, the present invention proposes to use the shear wave velocity function that changes with the longitudinal wave velocity model, which can not only ensure the instability problem of the conventional method in the finite difference wave field continuation, but also eliminate the impact of the shear wave on the inverse wave field to the greatest extent. Noise effects in time-shifted imaging. The present invention belongs to one of the finite difference methods. The invention includes a computer numerical simulation method of seismic wave field in anisotropic medium and an implementation method applied to reverse time migration ...

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Abstract

The invention provides a pure P-wave anisotropic wave field simulation method and belongs to the field of seismic wave migration in seismic wave exploration. The method comprises the following steps: reading a velocity model and anisotropic parameters including Thomsen parameter epsilon, Thomsen parameter delta and anisotropic dip angle beta in an anisotropic model, and then using the following formula to obtain the SV wave velocity: Vsv=Vp*(epsilon-delta)/C, wherein Vsv is the SV wave velocity, Vp is the P wave velocity, * is a product sign, and C is a constant; (2) multiplying the SV wave velocity obtained in step (1) by a constant to obtain a new shear wave velocity; (3) reading seismic data, inputting the new shear wave velocity obtained in step (2) and then using a finite difference method to realize wave field simulation of seismic waves in an anisotropic medium to obtain a wave field simulation result; and (4) using the wave field simulation result in step (3) to realize reverse-time migration imaging.

Description

technical field [0001] The invention belongs to the field of seismic wave migration in seismic wave exploration, and in particular relates to a pure longitudinal wave anisotropic wave field simulation method, which can be applied to seismic wave reverse time migration imaging and the like. Background technique [0002] Most of the existing migration techniques assume isotropic media as the basic assumption, then simulate the seismic wave field, and use the imaging conditions to realize migration imaging. Reverse time migration technology is a migration imaging technology realized by two-way wave equation simulation. It is one of the main imaging methods developed in the industry at present. It has rich wave field information and is suitable for migration imaging of complex geological structures. With the increasing difficulty of exploration and the complexity of subsurface media, not only reverse time migration technology in isotropic media is required, but also migration im...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 李敏朱秀云周树理王慧慧万红霞冯佳丽胡珊珊张代兰彭璐傅星菊
Owner CHINA PETROLEUM & CHEM CORP
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