Lithology and Macroscopic Coal Lithotype Identification of Coal-Bearing Measures Based on Elemental Mud Logging: A Case Study of the Eastern Ordos Basin Coal Seam
2025
Yuejiao Liu | Wenya Zhang | Fuqiang Lai | Mingyang Zhang | Honghua Sun | Zongsheng Zhou | Jianmeng Sun | Ruyue Wang | Shanshan Zheng
China is rich in coalbed methane (CBM) resources, and the key to realizing the scale and efficiency of CBM development is to build &ldquo:engineering tools&rdquo: for exploration and development continuously. Accurate calculation of rock components and precise identification of lithology and macroscopic coal lithotypes of coal-bearing measures are the basis for the evaluation of CBM geological engineering. This paper proposes a method to identify the lithology and macroscopic coal lithotypes of coal-bearing measures based on elemental mud logging. Firstly, a coal seam demarcation line is constructed based on the elemental mud logging to divide the coal and non-coal seams. Secondly, the content of each component in the coal and non-coal seams is calculated. Finally, based on the results of the calculations, a method for recognizing the lithology of non-coal seams and macroscopic coal lithotypes of coal seams is constructed based on the combination of the S (sulfur) element innovatively. The calculation error of mineral and proximate analysis components is less than 10%, and the average accuracy of lithology and macroscopic coal lithotype identification is as high as 87%. The results can provide important technical guidance for the geological evaluation of coal-bearing measures and the selection of target seams.
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