Coalbed methane reservoir properties assessment and 3D static modeling for sweet-spot prediction in Dahebian block, Liupanshui Coal field, Guizhou Province, southwestern China

Debashish Mondal; Shuxun Sang; Sijie Han; Xiaozhi Zhou; Fuping Zhao; Jinchao Zhang; Wei Gao

Heliyon (Aug 2024)

Coalbed methane reservoir properties assessment and 3D static modeling for sweet-spot prediction in Dahebian block, Liupanshui Coal field, Guizhou Province, southwestern China

Debashish Mondal,
Shuxun Sang,
Sijie Han,
Xiaozhi Zhou,
Fuping Zhao,
Jinchao Zhang,
Wei Gao

Affiliations

Debashish Mondal: School of Resources and Earth Sciences, China University of Mining and Technology, Xuzhou, 221116, China; Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, China University of Mining & Technology, Xuzhou, 221008, China; Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou, 221008, China; Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou, 221008, China; Department of Geology and Mining, University of Rajshahi, Rajshahi, 6205, Bangladesh
Shuxun Sang: School of Resources and Earth Sciences, China University of Mining and Technology, Xuzhou, 221116, China; Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, China University of Mining & Technology, Xuzhou, 221008, China; Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou, 221008, China; Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou, 221008, China; Corresponding author. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, China University of Mining & Technology, Xuzhou, 221008, China.
Sijie Han: Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou, 221008, China; Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou, 221008, China; Corresponding author. Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou, 221008, China.
Xiaozhi Zhou: School of Resources and Earth Sciences, China University of Mining and Technology, Xuzhou, 221116, China; Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, China University of Mining & Technology, Xuzhou, 221008, China
Fuping Zhao: Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas, Ministry of Natural Resources, Guiyang, 550081, China; Guizhou Engineering Institute of Oil & Gas Exploration and Development, Guiyang, 550081, China
Jinchao Zhang: Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou, 221008, China; Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou, 221008, China
Wei Gao: Guizhou Provincial Engineering and Technology Research Center of Coalbed Methane and Shale Gas, Guiyang, 550081, China

Journal volume & issue: Vol. 10, no. 15
p. e35481

Abstract

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Guizhou Province has many multi-layer, thin-thick coal seams; however, complex geology, incomplete reservoir characterization, and sweet-spot selection technology prevent large-scale coalbed methane (CBM) development. This study evaluates the CBM reservoir properties within the Dahebian block using logging data, coal sample analysis, and well-testing data and develops a 3D static reservoir properties model to analyze their spatial and vertical propagation. A sweet spot evaluation model was established using a multi-level fuzzy method based on 9 parameters extracted from a 3D static reservoir properties model. The coal measure has 22 coal seams, and seams >2 m thick have 2 or 3 thin non-coal layers intercalated. Coal seams 1#, 7#, and 11# are thin to thick, deeply buried, widely distributed, and have high gas content and saturation. Undeformed and cataclastic coal predominates the coal seam 1# and 7#, whereas coal seam 11# is dominated by cataclastic and granulated coal. The southern and central parts of coal seam 7# and 11# have less tectonically deformed coal (TDC). Coal seams 1# and 7# have low permeability relative to seam 11# and are localized, while coal seams 11# have high permeability, are extensively distributed, and contain substantial gas concentrations. Comparative analysis of evaluation scores and CBM production statistics shows that high scores indicate sweet spots for CBM development. Sweet-spot potential was classified as high, medium, and low. Scattered sweet spots are found in single layers, while combined development (1# + 7#+11#) reveals a wider high-potential area in the south-central region. This area, featuring deep, thick coal seams, high permeability, gas saturation, reservoir pressure, and low TDC proportion, indicates significant development potential. This study validates CBM development statistics, identifies future development areas, and guides the development of geologically complex Guizhou CBM.

Published in Heliyon

ISSN: 2405-8440 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Science: Science (General); Social Sciences: Social sciences (General)
Website: https://www.cell.com/heliyon/home

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