Microtremor exploration based near-surface P-wave velocity modeling method and device

By correcting geological boundaries and structural models through microseismic exploration technology and converting shear wave velocity into p-wave velocity, the problem of insufficient accuracy in shallow velocity modeling was solved, and a high-precision near-surface p-wave velocity model was realized, providing a better foundation for seismic data processing.

CN120178323BActive Publication Date: 2026-07-24CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Filing Date
2023-12-19
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In shallow velocity modeling, existing technologies suffer from rapid changes in vertical velocity, which are affected by surface structure and lithology, resulting in low accuracy. Simple layered models cannot meet the requirements for high-precision seismic data processing.

Method used

By using micro-motion exploration technology to obtain surface geological maps of the target work area, correcting geological boundaries, drawing shallow surface structure models, converting shear wave velocity into P-wave velocity, and using the shallow surface structure model as a constraint for spatial interpolation, a near-surface P-wave velocity model is constructed.

Benefits of technology

It improves the accuracy of near-surface P-wave velocity modeling, provides a high-precision near-surface P-wave velocity model, and lays a good foundation for subsequent pre-stack depth migration.

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Abstract

The present disclosure relates to a near-surface P-wave velocity modeling method and device based on microtremor exploration, the method comprising: obtaining a surface geological map of a target work area based on surface investigation, and correcting the geological boundary of the surface geological map based on surface investigation; according to the stratum, fault and stratum occurrence information provided by the corrected surface geological map, drawing a geological cross section along a seismic survey line to obtain a shallow surface structure model of the target work area; obtaining the shallow surface S-wave velocity of each preset survey point of the target work area, and converting the shallow surface S-wave velocity of each preset survey point into P-wave velocity; taking the shallow surface structure model as a constraint, and performing spatial interpolation on the P-wave velocity of each preset survey point to obtain a near-surface P-wave velocity model based on the shallow surface structure model; based on the shallow surface structure model, the shallow velocity field, the inverted velocity is close to the stratum velocity, the accuracy is higher, and a better near-surface P-wave velocity model is provided for subsequent prestack depth migration.
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