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<p>Deep coalbed methane (CBM) constitutes a pivotal exploration target for current and future CBM development, and its hydrogeological conditions directly govern the generation, migration, and accumulation processes of coalbed methane. Utilizing logging and core experimental data, we applied backpropagation neural network, Gaussian process regression, and the Indonesian formula to accurately delineate aquifer locations/thickness, predict effective porosity, and derive water saturation, respectively. Integration with production well data revealed hydrogeological controls on water production. The results indicated the northwestern Mizhi area as a relatively water-rich zone; however, coal measure aquifers in the study area exhibit limited spatial continuity (patchy/island-like distribution), low porosity (average 6.18%), and moderate water saturation (average 75.29%). Moreover, water abundance evaluations exhibited no significant correlation with actual water production, confirming that the distribution and petrophysical properties (porosity, water saturation) of deep coal measure aquifers exert negligible impacts on CBM well water yields. This constitutes a fundamental contrast to shallow systems where aquifers trigger high water yields.</p>

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Aquifer Delineation in the Benxi Formation and Its Critical Impact on Deep CBM Productivity: A Case Study of the Central-Eastern Ordos Basin

  • 期刊论文

  • 发表日期：

    2025年12月14日

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  • Dongping Zhao,
  • Songhang Zhang,
  • Shuheng Tang,
  • Wenguang Tian,
  • Ke Zhang,
  • Kun Zhang

摘要

Deep coalbed methane (CBM) constitutes a pivotal exploration target for current and future CBM development, and its hydrogeological conditions directly govern the generation, migration, and accumulation processes of coalbed methane. Utilizing logging and core experimental data, we applied backpropagation neural network, Gaussian process regression, and the Indonesian formula to accurately delineate aquifer locations/thickness, predict effective porosity, and derive water saturation, respectively. Integration with production well data revealed hydrogeological controls on water production. The results indicated the northwestern Mizhi area as a relatively water-rich zone; however, coal measure aquifers in the study area exhibit limited spatial continuity (patchy/island-like distribution), low porosity (average 6.18%), and moderate water saturation (average 75.29%). Moreover, water abundance evaluations exhibited no significant correlation with actual water production, confirming that the distribution and petrophysical properties (porosity, water saturation) of deep coal measure aquifers exert negligible impacts on CBM well water yields. This constitutes a fundamental contrast to shallow systems where aquifers trigger high water yields.