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Decoupling elastic reverse time migration imaging method and device

A reverse time migration imaging and decoupling technology, applied in the field of exploration geophysics, can solve the problems of low decoupling precision and low precision of elastic reverse time migration imaging

Active Publication Date: 2020-06-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] The embodiment of the present application provides a decoupling elastic reverse time migration imaging method and device to solve the problem of low precision of elastic reverse time migration imaging in the prior art due to the low decoupling precision of the elastic wave field in the heterogeneous medium The problem

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Embodiment Construction

[0029] The principle and spirit of the present application will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are given only to enable those skilled in the art to better understand and implement the present application, rather than to limit the scope of the present application in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0030] Those skilled in the art know that the embodiments of the present application may be realized as a system, device, method or computer program product. Therefore, the disclosure of the present application can be specifically implemented in the form of complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0031] Considering that the waveform distortion and energ...

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Abstract

The invention provides a decoupling elastic reverse time migration imaging method and device, and the method in one embodiment comprises the steps of constructing a longitudinal wave continuation operator, taking a preset seismic wavelet as a longitudinal wave source, and carrying out the forward continuation according to the longitudinal wave continuation operator, and obtaining a vector longitudinal wave source wave field; constructing a decoupling no-conversion continuation operator based on a preset decoupling no-conversion equation, taking the target multi-component seismic data as a detection seismic source, and performing reverse continuation according to the decoupling no-conversion operator to obtain a vector longitudinal wave detection wave field and a vector transverse wave detection wave field which are decoupled from each other and propagated independently; performing cross-correlation imaging on the vector longitudinal wave source wave field, the vector longitudinal wavedetection wave field and the vector transverse wave detection wave field to obtain a single-shot reverse time migration imaging result; and performing superposition and low-wave-number noise suppression on the single-shot imaging result to obtain a target multi-wave imaging result. According to the scheme, the elastic wave field decoupling precision in a non-uniform medium can be effectively improved, and the elastic reverse time migration imaging precision can be further improved.

Description

technical field [0001] The present application relates to the technical field of exploration geophysics, in particular to a decoupling elastic reverse time migration imaging method and device. Background technique [0002] At present, according to the wavefield continuation equation used, reverse time migration imaging for multi-component seismic data can be divided into two categories: scalar equation migration imaging and elastic equation migration imaging. Under the scalar equation migration imaging system, multi-component seismic data first need to be decomposed into P-wave and S-wave data, and then the decomposed results are independently imaged. However, multi-component seismic data are often difficult to separate completely, which affects the accuracy of subsequent imaging. In the elastic equation migration imaging system, it is necessary to decouple the elastic wave field before applying the imaging conditions in order to obtain pure wave imaging results with clear ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/30G01V1/301
Inventor 杜启振赵强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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