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Travel-time table and angle table acquisition method for angle domain prestack depth migration and imaging method

A technology of pre-stack depth migration and acquisition method, which is applied to the imaging field of Kirchhoff pre-stack depth migration in the angle domain of anisotropic media, and can solve the problems of inconvenient numerical calculation and low efficiency.

Inactive Publication Date: 2016-06-01
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology

However, the traditional anisotropic medium ray tracing equation is expressed by stiffness coefficient instead of Thomsen parameter, which is inconvenient for numerical calculation and low in efficiency

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  • Travel-time table and angle table acquisition method for angle domain prestack depth migration and imaging method
  • Travel-time table and angle table acquisition method for angle domain prestack depth migration and imaging method
  • Travel-time table and angle table acquisition method for angle domain prestack depth migration and imaging method

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Embodiment Construction

[0028] Hereinafter, the method for obtaining the traveltime table and angle table of anisotropic medium angle domain Kirchhoff prestack depth migration and the anisotropic medium angle domain Kirchhoff stacking method of the present invention will be described in detail in conjunction with exemplary embodiments. An imaging method for frontal depth migration.

[0029] In an exemplary embodiment of the present invention, the acquisition method of traveltime table and angle table for prestack depth migration in angle domain of anisotropic medium can be realized through the following steps:

[0030] 1. According to the acoustic wave equation of anisotropic medium, the equation of the process function in anisotropic medium is derived

[0031] The so-called acoustic approximation is to assume that the propagation velocity of the qSV wave along the axis of symmetry (here, the qSV wave is called a quasi-shear wave, roughly meaning that it is similar to a shear wave, but not a shear wa...

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Abstract

The invention relates to a travel-time table and angle table acquisition method for anisotropic medium angle domain Kirchhoff prestack depth migration and an imaging method thereof. The acquisition method comprises steps: according to an anisotropic medium acoustic wave equation, an eikonal equation in the anisotropic medium is deduced, ray equations for anisotropic medium acoustic approximation are deduced and solved through the eikonal equation, ray paths, travel time and propagation direction information under the anisotropic medium acoustic approximation meaning are thus acquired, Angle domain ray tracing is carried out, and a travel-time table and an emergence angle table are built. The method of the invention has the advantages that the ray equations for the anisotropic medium can be approximatively deduced based on an acoustic law; the reliable travel-time table and the reliable angle table can be provided for Kirchhoff prestack depth migration; and thus, angle domain imaging can be realized accurately.

Description

technical field [0001] The present invention relates to a travel time table and angle table acquisition method for anisotropic (VTI) medium angle domain Kirchhoff (Kirchhoff) pre-stack depth migration and an anisotropic medium angle domain Kirchhoff pre-stack depth Offset imaging method. Background technique [0002] At present, prestack depth migration is a key technology that relies on the imaging of complex structures in strongly transversely heterogeneous media and the establishment of velocity models. Its algorithm implementation is either based on ray theory, such as Kirchhoff (Kirchhoff) migration and Gaussian beam migration, or based on wave theory, such as one-way wave equation depth continuation migration and two-way wave equation inverse time continuation migration. In the past ten years, the anisotropic medium depth migration method has also been greatly developed, and the transverse isotropic (TI) medium Kirchhoff migration, Gaussian beam migration, and one-way...

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 段鹏飞金德刚何光明唐虎张恩嘉陈立王珑
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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