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With the progression of conventional natural gas exploration and development technologies, research into unconventional natural gas in China’s Sichuan Basin—a major natural gas-producing region—has intensified. This region harbors diverse unconventional gas reservoirs, including coalbed methane, shale gas, and tight sandstone gas. This study focuses on the Permian Longtan Formation in the southern Sichuan Basin, particularly its coal-bearing strata. It details the characteristics of gas accumulation and evaluates the zones favorable for unconventional gas resources. Coalbed methane is identified as the primary focus for development, while shale gas and tight sandstone gas present comparatively lower economic values. The delineation of favorable zones for these resources estimates 14.738 billion cubic meters in Class I zones, 11.325 billion cubic meters in Class II zones, and 5.228 billion cubic meters in Class III zones. The findings prompt a stratified development strategy, offering new technical pathways for the integrated exploration and co-extraction of complex gas reservoirs, and provide innovative approaches to boost the production and expansion of coal-derived unconventional natural gas resources.

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Assessment of Unconventional Natural Gas Reservoir Characteristics and Favorable Areas in the Permian System of the Southern Sichuan Basin

  • 会议论文

  • 发表日期：

    2025年

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  • Hua-lian Zhang,
  • Dong-xin Guo,
  • Man-yi Li,
  • Wei Wang,
  • Yue-lei Zhang

摘要

With the progression of conventional natural gas exploration and development technologies, research into unconventional natural gas in China’s Sichuan Basin—a major natural gas-producing region—has intensified. This region harbors diverse unconventional gas reservoirs, including coalbed methane, shale gas, and tight sandstone gas. This study focuses on the Permian Longtan Formation in the southern Sichuan Basin, particularly its coal-bearing strata. It details the characteristics of gas accumulation and evaluates the zones favorable for unconventional gas resources. Coalbed methane is identified as the primary focus for development, while shale gas and tight sandstone gas present comparatively lower economic values. The delineation of favorable zones for these resources estimates 14.738 billion cubic meters in Class I zones, 11.325 billion cubic meters in Class II zones, and 5.228 billion cubic meters in Class III zones. The findings prompt a stratified development strategy, offering new technical pathways for the integrated exploration and co-extraction of complex gas reservoirs, and provide innovative approaches to boost the production and expansion of coal-derived unconventional natural gas resources.