Undercoal reservoir exploration-oriented in-well seismic data acquisition method

By optimizing the Walkaway VSP observation system and data inspection methods, the problem of difficult identification of sand bodies in sub-coal-bearing reservoirs was solved, high-precision well seismic data acquisition was achieved, and the accuracy of reservoir prediction was improved.

CN121634205APending Publication Date: 2026-03-10PETROCHINA CO LTD
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Patent Information

Application Number
CN202411227214.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-03
Publication Date
2026-03-10

AI Technical Summary

Technical Problem

Sand bodies in sub-coal reservoirs are difficult to identify. In Walkaway VSP technology, the shot point and the geophone are not on the same horizontal plane, which leads to data errors and affects the accuracy of reservoir prediction.

Method used

The Walkaway VSP observation system was used, and the location of the seismic source was marked by GPS navigation and manual methods to ensure that the geophone remained stationary downhole. A reasonable layout of excitation and receiving points was designed, and the combination of manual and intelligent inspection methods improved the data quality.

Benefits of technology

Effectively obtaining seismic wave information from sub-coal reservoirs improves reservoir prediction accuracy and provides a reliable data foundation for oil and gas reservoir exploration.

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Abstract

The invention provides an under-coal reservoir exploration-oriented in-well seismic data acquisition method, and belongs to the technical field of oil and gas field exploration and development engineering.The method comprises the following steps that a Walkaway VSP observation system is arranged, the Walkaway VSP observation system comprises excitation point measuring lines and a receiving point system, each excitation point measuring line is provided with a set of seismic sources, and each excitation point measuring line is provided with a set of seismic sources; the receiving point system comprises a plurality of detectors; the seismic sources are controlled to be excited alternately, excitation point positions of the seismic sources are marked through GPS navigation and a manual method, seismic data in a well are collected, and the underground horizontal orientation of the detector does not change during collection. According to the method, data collection is more stable, the reliability of seismic data collection in the well is ensured, errors generated by data collection are reduced, and the prediction precision of the under-coal reservoir is improved by accurately obtaining the in-well seismic information reflecting the under-coal reservoir.
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