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Upstream and downstream wave field decomposition-based inverse-time migration method and system

A technology of reverse time migration and traveling wave field, which is applied in the direction of measuring devices, instruments, scientific instruments, etc.

Inactive Publication Date: 2019-02-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] When performing pre-stack reverse time migration imaging in complex structural work areas, the present invention introduces a method based on the up-and-down The reverse time migration algorithm of traveling wave field decomposition, by constructing new imaging conditions, using specific direction wave field for cross-correlation imaging, can effectively solve the problem of low-frequency noise and migration artifacts while ensuring imaging accuracy, and improve imaging quality. It is of great significance to promote high-precision seismic imaging

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[0049] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0050] The invention belongs to the technical field of seismic data pre-stack depth migration imaging. Because conventional reverse time migration does not consider the directionality of the wave field when applying the full wave field cross-correlation imaging condition, it will cause low wave number, high amplitude migration noise and migration artifacts in the imaging results, reducing the migration Sectional imaging accuracy. The prese...

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Abstract

The invention proposes an upstream and downstream wave field decomposition-based inverse-time migration method and system. The method comprises the steps of building an analysis wave field of an earthquake source and earthquake record; performing wave field positive and negative prolongation on the analysis wave field; performing Hilbert transform on the wave field in an imaging gridding at each propagation moment along a depth direction to obtain a transformed conversion wave field; solving an upstream wave field and a downstream wave field according to an original wave field and the conversion wave field; and selecting the wave field in a special direction to image according to a mutual correlation imaging condition. By the upstream and downstream wave field decomposition-based inverse-time migration method, the low-frequency noise in inverse-time migration can be effectively prevented, and the imaging profile accuracy is improved; and meanwhile, the method has relatively good wavelet amplitude-maintaining performance, and technological guarantee is also provided for subsequent fidelity processing.

Description

technical field [0001] The invention belongs to the technical field of pre-stack depth migration imaging of seismic data, and in particular relates to a reverse time migration method and system based on uplink and downlink wave field decomposition. Background technique [0002] With the exploration and development of complex areas, the accuracy of pre-stack migration imaging is getting higher and higher to obtain correct structural understanding and favorable oil and gas traps. At present, prestack depth migration algorithms are mainly divided into two types based on ray theory and wave equation. Kirchhoff migration and one-way wave migration are representatives of these two types of methods, which have the advantages of stable calculation and high calculation efficiency. However, in the face of complex geological There are algorithm deficiencies in construction, such as multi-path, inclination limit and other issues. [0003] Reverse time migration realizes the forward and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/36G01V2210/48G01V2210/512G01V2210/632
Inventor 许璐李博王小青
Owner CHINA PETROLEUM & CHEM CORP
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