• [口頭報告]Coalbed Methane Reservoir Properties Evaluation and 3D Static Modeling for Sweet-Spot Prediction in Dahebian Block, Guizhou Province, China
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    [口頭報告]Coalbed Methane Reservoir Properties Evaluation and 3D Static Modeling for Sweet-Spot Prediction in Dahebian Block, Guizhou Province, China

    Coalbed Methane Reservoir Properties Evaluation and 3D Static Modeling for Sweet-Spot Prediction in Dahebian Block, Guizhou Province, China
    編號:36 稿件編號:49 訪問權限:僅限參會人 更新:2024-05-17 18:57:02 瀏覽:136次 口頭報告

    報告開始:2024年05月30日 19:00 (Asia/Shanghai)

    報告時間:10min

    所在會議:[S1] Resource Development and Utilization ? [S1-2] Evening of May 30th

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    摘要
    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 of the Dahebian block utilizing logging data from 23 wells, coal samples, and well testing data from well DH-1. Based on reservoir property assessment, a 3D static model was created to evaluate spatial distribution and propagation. Finally, a comprehensive evaluation score was obtained using a multi-level fuzzy method using nine parameters derived from the 3D model. The coal measure strata have 22 deeply buried coal seams, although seams >2 m thick have 2 or 3 thin non-coal layers intercalated. Coal seams 1#, 7#, and 11# are widely distributed and have high gas saturation and gas content, which increases along the syncline axis. Moreover, the southern and central parts of coal seam 7# and 11# have less tectonically deformed coal (TDC), whereas cataclastic TDC dominates. The coal seam 11# has good permeability compared to others; also, it is relatively high, where the degree of TDC development is low. The reservoir pressure gradient and coefficient indicated seams 1# and 7# are low-pressure, and 11# is a normal pressure anomaly reservoir. The sweet-spot evaluation score for coal seam 1#, 7#, and 11# commingled CBM development is 0.64-0.88. Comparing Zhongshan Dahebian CBM development data with evaluation scores shows areas with scores <0.78, ≥0.78-≤0.84, and >84 produced an average of <300m3, 300-500m3, and >500m3 of CBM daily, respectively. The research area has a high potential sweet spot for commingled production in the south (evaluation score >0.84), medium potential sweet spot in the center and south-eastern areas (≥0.78 to ≤0.84), and low potential in the western and northern parts (<0.78). This study validates CBM development statistics, identifies future development areas, and provides the basis for geologically complex Guizhou CBM development.
     
    關鍵字
    Coalbed methane; reservoir properties; 3D static modeling; sweet-spot prediction.
    報告人
    Debashish Mondal
    China University of Mining and Technology

    稿件作者
    Debashish Mondal China University of Mining and Technology
    Shuxun Sang China University of Mining and Technology
    Sijie Han China University of Mining and Technology
    Xiaozhi Zhou China University of Mining and Technology
    Fuping Zhao Guizhou Engineering Institute of Oil & Gas Exploration and Development, Guiyang, China
    Wei Gao Guizhou Provincial Engineering and Technology Research Center of Coalbed Methane and Shale Gas, Guiyang, China
    Jinchao Zhang China University of Mining and Technology
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