Elastic migration seismic wave field construction method and elastic migration seismic wave field construction device

A technology of seismic wave field and construction method, applied in the field of exploration geophysics
CN103149585AActive Publication Date: 2013-06-12BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2013-06-12

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Abstract

The invention provides an elastic migration seismic wave field construction method and an elastic migration seismic wave field construction device. The method includes computing a finite difference coefficient of extended compact staggered grids according to an elastic wave velocity stress equation; computing a finite difference operator matrix of the extended compact staggered grids; constructing forward direction extrapolation operator of a seismic source wave field, and a reverse-time extrapolation operator of a detection wave field; achieving forward direction extrapolation of a seismic wave field to obtain the seismic source wave field according to the forward direction extrapolation operator of the seismic source wave field, a preset medium model and a preset seismic source function; and achieving reverse-time extrapolation of the seismic wave field to obtain the detection wave field according to the reverse-time extrapolation operator of the detection wave field, a preset medium model and preset multi-component seismic data. Compared with an existing method for constructing an elastic deflection seismic wave field by utilization of a conventional finite difference method and a compact difference method, the number of difference base frame grid points is reduced under the condition of same difference orders, the construction precision of a complex medium wave field can be effectively improved, and therefore the imaging precision of reverse-time migration is improved.
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Description

technical field

[0001] The invention relates to the field of exploration geophysics, in particular to a method and device for constructing an elastic migration seismic wave field. Background technique

[0002] In the construction of the elastic migration seismic wave field, the source wave field and the receiver wave field need to be constructed. The source wave field is generally obtained by time-forward extrapolation of the elastic wave velocity-stress equation, and the receiver wave field is generally obtained by the elastic wave velocity-stress equation. Obtained by reverse time extrapolation.

[0003] At present, the commonly used numerical method for the extrapolation of the elastic wave velocity-stress equation is based on the staggered grid finite difference method. The advantage of this method is that it can accurately describe complex media through grid division, fast calculation speed, and low memory requirements. But the problem is that to obtain higher accuracy...

Claims

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