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Elastic vector reverse time migration imaging method

A reverse time migration imaging and vector technology, applied in the field of exploration geophysics, can solve the problem that the vector wave field cannot directly obtain the scalar imaging results, and achieve the effect of avoiding too many imaging sections

Active Publication Date: 2016-07-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] In order to solve the problem that the vector wave field cannot directly obtain scalar imaging results, the present invention provides an elastic vector reverse time migration imaging method, which can obtain elastic vector reverse time migration imaging in scalar form based on elastic vector wave field dot product cross-correlation Reverse Time Migration Imaging Results

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Embodiment Construction

[0031] Such as figure 1 As shown, the elastic vector reverse time migration method, the steps are as follows:

[0032] Step 1: According to the medium model and the given source wavelet, the forward extrapolation of the wave field is realized, and the decoupled longitudinal and transverse wave fields are obtained by using the decoupled continuation equation method. The specific method is as follows:

[0033] (1) According to the pre-set medium model, load the source wavelet and use the elastic wave propagation operator to realize the forward time extension of the seismic wave field and construct the source vector wave field:

[0034] Using the following first-order velocity-stress elastic wave equation

[0035] τ · = C...

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Abstract

The invention belongs to the field of exploration earth physics and specifically relates to an elastic vector reverse time migration imaging method. According to the invention, multi-component seismic data is used as input, an elastic wave propagation operator is utilized to carry out wave field prolongation, an elastic vector seismic wave field is constructed; and a decoupling prolongation equation method is utilized to obtain longitudinal and transverse wave fields of decoupling; vector points of the longitudinal and transverse wave fields with seismic source illumination compensation are utilized to construct elastic wave cross-correlation imaging conditions, and a multi-component seismic data elastic vector reverse time migration imaging result is obtained; and low-frequency noise suppression is carried out on the imaging result, and a final elastic vector reverse time migration imaging result is obtained. The elastic vector reverse time migration imaging method solves the scalar imaging problem of the longitudinal and transverse wave fields, and the imaging precision of elastic reverse time migration under a complex construction is improved.

Description

technical field [0001] The invention belongs to the field of exploration geophysics, and in particular relates to an elastic vector reverse time migration imaging method. Background technique [0002] At present, the migration imaging of multi-component seismic data can be divided into two systems: one is the scalar migration imaging system. Under this system, the multi-component seismic data is firstly decomposed into P-wave data and PS migration imaging; the second is the multi-component joint elastic reverse time migration imaging system, which directly combines multi-component seismic data as the boundary value condition of the vector elastic wave field, and reconstructs the wave field based on the elastic wave equation, and finally obtains Component imaging results, or elastic wavefield imaging results, is a theoretically accurate imaging method. Usually, the multi-component joint elastic reverse time migration imaging method to obtain the elastic wave field imaging va...

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 杜启振郭成锋公绪飞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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