Sandstone thickness map acquisition method and device, electronic equipment and medium

By analyzing the log sensitive parameter and well-seismic lithologic inversion for drilling in the research area, and combining the inverse distance interpolation method to obtain the sandstone threshold value data body, the problem of large error in the sandstone thickness map caused by standardized treatment in the existing technology is solved, and a higher precision sandstone thickness prediction and graph drawing is achieved.

CN119717001AActive Publication Date: 2025-03-28PETROCHINA CO LTD
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Patent Information

Application Number
CN202311279278.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-28
Publication Date
2025-03-28
Estimated Expiration
2043-09-28

AI Technical Summary

Technical Problem

When compiling sandstone thickness maps in the prior art, due to the standardized processing of logging curves, the value of the rock-electrical parameters changes, making it difficult to accurately calculate the true sandstone thickness, especially in areas with large structural drops and large lithologic changes, the error is large and the graph is unreliable.

Method used

By analyzing log sensitive parameters for drilling in the research area, logging parameters for lithology inversion are determined, well-seismic inversion is combined with seismic data, sandstone threshold value of drilling is determined, threshold value plane data is obtained using inverse distance interpolation method, residual value data body is determined based on the inversion data body and threshold value data body, and sandstone thickness map is obtained according to the inversion data body and the threshold value data body, and data points perpendicularly reflecting the sandstone data are statistically obtained.

Benefits of technology

The prediction accuracy of sandstone thickness and the drawing accuracy of sandstone thickness map are improved, errors are reduced, and the reliability of the map is enhanced.

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Abstract

The invention discloses a sandstone thickness map obtaining method and device, electronic equipment and a medium, and the method comprises the steps: carrying out the logging sensitive parameter analysis of a corresponding drilling well in a research area, determining a logging parameter for lithology inversion, and carrying out the well-to-seismic joint lithology inversion based on the logging parameter, and obtaining an inversion data body; performing well logging lithology interpretation on corresponding drilling wells in the research area to determine sandstone well logging parameter threshold values; obtaining sandstone threshold value plane data based on an inverse distance interpolation method and according to the threshold value, and obtaining a sandstone threshold value data body according to the seismic data vertical sampling interval and the threshold value plane data; and determining a residual value data volume according to the inversion data volume and the sandstone threshold value data volume, and obtaining a sandstone thickness map by counting the number of sandstone data points reflected in the residual value data volume. According to the method, the sandstone thickness prediction precision and the sandstone thickness map drawing accuracy can be improved through well-to-seismic joint lithology inversion and determination of the threshold value of the drilled well in the research area.
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