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Pre-stack depth migration method

A pre-stack depth migration and depth technology, which is applied in the field of seismic exploration, can solve the problems of insufficient accuracy and failure to achieve wave field separation, and achieve the effect of accurate homing and multi-component migration.

Active Publication Date: 2012-10-03
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI +1
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Problems solved by technology

[0008] This method has the following two shortcomings: 1) What is obtained is the total vibration energy of the two components, and the wave field separation is not realized; 2) The migration result obtained by this method is that when the energy of a certain shot point propagates to the underground reflection interface excited vibration
But prestack depth migration relies on a more accurate velocity model
Conventional velocity modeling methods cannot achieve sufficient accuracy

Method used

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Embodiment Construction

[0068] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0069] method principle

[0070] Such as figure 1 As shown, the continuation equation of the three-dimensional vector wave field in a homogeneous isotropic medium is:

[0071] u n ( x → , t ) = 1 4 π ∫ - ∞ ∞ ∫ - ∞ ∞ [ ( 1 - ...

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Abstract

The invention relates to the field of seismic prospecting, in particular to a pre-stack depth migration method. The method comprises the following steps of: performing migration velocity analysis on seismic data; calculating travel time, arc length, emergence angle and incidence angle by ray tracing; performing migration aperture calculation; and performing pre-stack depth migration by using a Kirchhoff integration vector migration formula. The method integrates migration velocity analysis, migration aperture selection, ray tracing and Kirchhoff integration formula, does not need wave field separation, and realizes multi-component simultaneous migration and accurate homing of converted wave. Based on the practical exploration data, the pre-stack depth migration method has good surface imaging effect and high imaging resolution, the continuity of the deep reflecting in-phase axis on a converted wave imaging section is improved, and the construction is clearer.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a pre-stack depth migration method. Background technique [0002] Migration is the last step in seismic data processing, and it is also the most important and critical process, especially for complex subsurface media. [0003] Due to the non-horizontal nature of the underground medium horizon, the seismic stack section cannot reflect the real horizon shape. Therefore, it is necessary to further migrate the seismic data on the basis of stacking to correct the horizon due to the existence of the stratum dip. The time-shifting of the illusion of reflection makes the reflection of the underground layer return to its original position, reflecting the real undulating shape and occurrence of the formation. [0004] There are two types of migration processing methods, one is performed on the basis of stacking, called post-stack migration; the other is migration processing before stack...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 王赟芦俊
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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