A method for density correction of a gamma-gamma density log

By employing the density correction method of gamma-gamma density logging and utilizing the count rate ratio and density calibration coefficient, the interference of radioactive formations on density logging was resolved, improving the accuracy of density logging and lithology identification, and meeting the needs of sandstone-type uranium deposit exploration.

CN116794749BActive Publication Date: 2025-12-12BEIJING RES INST OF URANIUM GEOLOGY
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Patent Information

Application Number
CN202310906987.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-07-21
Publication Date
2025-12-12
Estimated Expiration
2043-07-21

AI Technical Summary

Technical Problem

In sandstone-type uranium exploration, gamma rays from radioactive strata interfere with density logging, causing density curve distortion, affecting the accurate identification of lithology and the classification of permeable lithology, and consequently affecting the selection of in-situ leaching mining techniques.

Method used

The density correction method of gamma-gamma density logging is adopted. The count rate ratio of long-source detector to natural gamma detector and the count rate ratio of short-source detector to natural gamma detector are obtained by using model well. The natural gamma ray interference of radioactive strata is deducted by the count rate ratio and the density value is calculated by combining the density calibration coefficient.

Benefits of technology

It effectively reduces the interference of radioactive formations on density logging, improves the accuracy of density logging, ensures the accuracy of lithology identification and permeability classification, and meets the basic physical property parameter requirements of in-situ leaching mining.

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Abstract

This application relates to the field of gamma-gamma density logging technology, specifically providing a density correction method for gamma-gamma density logging, including: obtaining the count rate ratio R of a long-source detector (GGFR) and a natural gamma detector (NGR) using a model well. GGFR / NGR And the count rate ratio R of the short-source detector GGNR to the natural gamma detector NGR GGNR / NGR ; Obtain the density calibration coefficient of the density logging tool; Perform logging using the density logging tool and obtain the count rate N of the natural gamma detector NGR, long-source detector GGFR, and short-source detector GGNR. NGR N GGFR and N GGNR Based on the obtained count rate N NGR N GGFR N GGNR The ratio of the count rate to the count rate R GGFR / NGR R GGNR / NGR The net count rate of the long-source detector (GGFR) and the short-source detector (GGNR) is calculated to correct the count rate used for density parameter calculation; the formation density is then calculated based on the density calibration coefficient and the net count rate. This application can effectively correct the density and meet the accuracy requirements of density logging.
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