沁水盆地榆社—武乡区块二叠系煤系页岩储层地质建模及“甜点”预测

doi:10.12108/yxyqc.20240409

Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (4): 98-108.doi: 10.12108/yxyqc.20240409

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Geological modeling and“sweet spot”prediction of Permian coal measures shale reservoirs in Yushe-Wuxiang block，Qinshui Basin

SHEN Youyi^1,2, WANG Kaifeng^3,4, TANG Shuheng^3,4, ZHANG Songhang^3,4, XI Zhaodong^3,4, YANG Xiaodong^1,2

1. Key Laboratory of Monitoring and Protection of Natural Resources in Mining Cities, Ministry of Natural Resources, Jinzhong 030600, Shanxi, China;
2. Coal Geological Geophysical Exploration Surveying & Mapping Institute of Shanxi Province, Jinzhong 030600, Shanxi, China;
3. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
4. Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering, Beijing 100083, China

Received:2023-02-28 Revised:2023-04-24 Online:2024-07-01 Published:2024-07-04

Abstract

Abstract: The coal measures shale gas resources in Qinshui Basin are abundant，but exploration and development are still in the early stages. Based on drilling，well logging，and seismic interpretation data，combined with organic geochemistry and reservoir physical property experimental test data，a three-dimensional geological modeling technique was used to establish a geological model of coal measures shale from the bottom of Shanxi Formation to the upper Taiyuan Formation of Permian in Yushe-Wuxiang block，Qinshui Basin，and“sweet spot”areas of coal measures shale gas were predicted. The results show that：（1）The Carboniferous-Permian coal measure strata model for Yushe-Wuxiang block reflects that the development of coal measures shale reservoirs is mainly controlled by tectonic activities，showing a distribution pattern of“shallow in the east and deep in the west，and overall continuous”.（2）The sedimentary model based on sequential indicator method indicate that the transition from marine-continental transitional facies to nearshore continental facies sedimentary environments during Taiyuan to Shanxi period in the study area，providing a conducive sedimentary environment for the formation of stable and high-quality shale reservoirs.（3）Facies-controlled attribute modeling achieved spatial distribution simulation and fine characterization of reservoir parameters. The average values of mudstone ratio，porosity，gas content，total organic carbon content，and vitrinite reflectance are 0.57，10.02%，1.21 m³/t，2.18% and 2.45%， respectively，revealing the favorable reservoir capacity，gas content，organic matter abundance，and resource potential of coal measures shale. The brittleness index model indicates favorable zones after shale fracturing. （4）On the basis of fine three-dimensional geological modeling，the three-dimensional grids were assigned integrals，and the geological resource of Permian coal measures shale gas in the study area is estimated at 1 344.98×10⁸ m³. Analytical hierarchy process and fuzzy evaluation methods were used to predict“sweet spot” areas of shale gas. Type I“sweet spot”area for shale gas presenting both geological and engineering advantages， predominantly distributed in the northeastern，central，and northwestern parts of the study area.

Key words: coal measures strata, shale gas, geological modeling, reservoir characteristics, “sweet spot”prediction, geological resources, Permian, Yushe-Wuxiang block, Qinshui Basin

CLC Number:

TE122.2

SHEN Youyi, WANG Kaifeng, TANG Shuheng, ZHANG Songhang, XI Zhaodong, YANG Xiaodong. Geological modeling and“sweet spot”prediction of Permian coal measures shale reservoirs in Yushe-Wuxiang block，Qinshui Basin[J].Lithologic Reservoirs, 2024, 36(4): 98-108.

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Geological modeling and“sweet spot”prediction of Permian coal measures shale reservoirs in Yushe-Wuxiang block，Qinshui Basin

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