Imaging method and device based on optional wide angle wave equation

A wave equation, arbitrary wide-angle technology, applied in the field of exploration geophysics, can solve the problem that the imaging accuracy needs to be improved, and achieve the effect of optimizing the reference velocity parameters, improving imaging accuracy, and improving imaging quality

Active Publication Date: 2013-09-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Imaging method and device based on optional wide angle wave equation
  • Imaging method and device based on optional wide angle wave equation
  • Imaging method and device based on optional wide angle wave equation

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[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] like figure 1 As shown, an embodiment of the present invention provides a flowchart of an imaging method based on an arbitrary wide-angle wave equation, and the imaging method based on an arbitrary wide-angle wave equation includes:

[0042] 101. Obtain the established velocity model and the given source wave field;

[0043] 102. Using forward modeling to obtain synthetic seismic records of velocity models;

[0044] 103. Perform dip filter processing ...

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Abstract

An embodiment of the invention provides an imaging method and device based on an optional wide angle wave equation. The method includes acquiring an established speed model and a determined source wave field; utilizing forward simulation to acquire a synthetic seismogram of the speed model; performing the inclination filtering process on the synthetic seismogram of the forward simulation and the determined source wave field; analyzing imaging accuracy of an optional wide-angle wave equation according to dispersion relation, and obtaining an optimal reference speed of the optional wide-angle wave equation; figuring out the optional wide-angle wave equation of the optimal reference speed by the finite difference method; performing migration imaging by adopting correlation imaging conditions to improve migration imaging accuracy of the optional wide-angle wave equation. Evanescent wave imaging noises of optional wide-angle wave equation prestack depth migration can be suppressed effectively, and imaging quality is improved; according to a reference speed optimization method, the imaging accuracy of the optional wide-angle wave equation prestack depth migration, so that stratigraphic with steeper dip angle can be imaged.

Description

technical field [0001] The invention relates to the field of exploration geophysics, in particular to an imaging method and device based on an arbitrary wide-angle wave equation. Background technique [0002] The complexity of exploration targets and the improvement of exploration accuracy require that seismic migration imaging methods can accurately image geological bodies with high-steep dip angle structures and severe lateral velocity changes, which greatly promotes the development of pre-stack depth migration methods. develop. [0003] At present, the prestack depth migration methods mainly include Kirchhoff integral classification migration imaging method based on ray theory and wave equation migration imaging method based on wavefield continuation. The geometric meaning of the integral classification method is relatively intuitive, and it has flexible target processing capabilities and high computational efficiency. It has become a pre-stack depth migration imaging me...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 周辉林鹤陈汉明王颖李彦奇
Owner BC P INC CHINA NAT PETROLEUM CORP
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