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Forward computation method of motion equation of elastic wave on relief surface

A technology of wave equation and undulating surface, applied in the field of seismic exploration data processing and interpretation, can solve the problem of unsolved implementation of free boundary conditions, achieve the effect of good free boundary conditions and improve calculation efficiency

Inactive Publication Date: 2011-05-18
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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Problems solved by technology

However, the above technical solutions still do not solve the implementation problem of free boundary conditions

Method used

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  • Forward computation method of motion equation of elastic wave on relief surface
  • Forward computation method of motion equation of elastic wave on relief surface

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Embodiment Construction

[0038] Using the idea of ​​longitudinal coordinate transformation, the irregular calculation area is transformed into a regular calculation area under the new coordinate system. Based on the concept of zero-traction free boundary, the free boundary condition under the new coordinate system is derived, and the implicit difference scheme is used to calculate the freedom Seismic wavefields on the boundary.

[0039](1) The use of longitudinal coordinate transformation to transform the irregular calculation area into a regular calculation area under the new coordinate system is realized by performing longitudinal coordinate transformation on the two-dimensional elastic wave equation. The specific steps are as follows:

[0040] a. Divide the space vertically and horizontally differently, and divide the observation area into nx-1 sections in the horizontal direction; divide the vertical direction from the bottom of the model to the surface, with a total of nz sampling points, that is,...

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Abstract

The invention discloses a forward computation method of a motion equation of an elastic wave on a relief surface, relating to the field of processing and explanation of the seismic exploration data of oil seismic exploration. The forward computation method comprises the following steps of: converting an irregular computational domain into a regular computational domain under a new coordinate system by utilizing longitudinal coordinate transformation; educing a free boundary condition under the new coordinate system on the basis of a zero-traction free boundary; and computing a seismic wave field positioned on the free boundary by adopting an implicit difference scheme. The forward computation method can process complex terrains, is adapted to the surface relief, also enhances the computing efficiency and can better implement the free boundary condition.

Description

technical field [0001] The invention relates to the field of seismic exploration data processing and interpretation of petroleum seismic exploration, in particular to an underground medium forward modeling method used in complex surface petroleum seismic exploration. Background technique [0002] The numerical simulation of seismic wave propagation is to simulate the propagation of seismic wave through numerical calculation on the basis of certain seismic wave propagation theory. Although the seismic wave propagation theory on which the numerical simulation technology is based is an approximation of the actual seismic wave propagation law to varying degrees, the technology is flexible, convenient, and fast in simulation, making it widely used in theoretical research and practice. In recent years, the rapid development of computer technology has further Promote the development of numerical simulation technology. Therefore, the numerical simulation of seismic wave propagation...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 邹文何光明李亚林李志荣陈爱萍陶正喜李忠巫骏胡善政敬龙江
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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