Prestack depth migration imaging method based on generalized diffraction superposition

By using single-way fluctuation equation and angular region decomposition technology in the generalized diffraction superposition method, the problems of low computational efficiency and poor imaging results caused by the two-way fluctuation equation are solved, and efficient and clear pre-stack depth offset imaging is achieved.

CN119224845AActive Publication Date: 2024-12-31CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202310785469.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-06-29
Publication Date
2024-12-31
Estimated Expiration
2043-06-29

AI Technical Summary

Technical Problem

In the prior art, the generalized diffraction superposition method using the two-way wave equation is not high in calculation efficiency and poor imaging effect when imaging before stacking depth offset, and includes wave field components that are not beneficial to imaging.

Method used

The Green’s function is calculated using the single-way fluctuation equation, and the relative positions of the imaging point, the source point and the detection point are judged through angle calculation to perform regional decomposition. The Green’s function is only recursively solved in the necessary areas, reducing useless calculation areas and improving calculation efficiency.

Benefits of technology

The defects of the two-way fluctuation equation are avoided, the imaging efficiency is improved, the imaging effect is enhanced, the noise is reduced, and the spatial grid interval is adapted to the greater pre-stack depth offset imaging is achieved.

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Abstract

The invention belongs to the technical field of oil and gas seismic exploration, and particularly relates to a prestack depth migration imaging method based on generalized diffraction superposition. According to the method, the Green's function required by imaging is calculated by using the one-way wave equation, so that the defects of the two-way wave equation are avoided, the imaging result does not contain wave field components which are useless for imaging, a good imaging effect is ensured, the calculation amount is reduced, the operation speed is increased, and the imaging efficiency is improved; moreover, Green's function solution is realized in a frequency domain, and the sampling rate dispersion problem of a time domain does not exist, so that the calculation mode of the one-way wave equation can adapt to a larger space grid interval; according to the method, a velocity model is constructed, relative positions of an imaging point and a seismic source point and relative positions of the imaging point and a detection point are judged through angle calculation, so that regional decomposition is carried out on the velocity model, recursion only needs to be carried out in a necessary region when a Green's function is solved, recursion does not need to be carried out in a full-velocity model space, on the basis of ensuring a recursion effect, useless calculation regions are removed, and the imaging efficiency is further improved.
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Citation Information

Patent Citations

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