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<p>The coal reservoir characteristics are one of key factors controlling coalbed methane (CBM) distribution and enrichment and the CBM development method. Previously, the study of the coal reservoir characteristics in China has been focused on the shallow coal seam (&lt;1500 m), but less attention has been paid to the deep coal reservoir (&gt;1500 m). Thus, the exploration and development of CBM resources is hindered. The CBM exploration and development in the Ordos Basin is concentrated in the coal seam shallower than 800m in the eastern margin and the coal seam has a high exploration level, but the coal seam deeper than 800m in the Shenmu area is the blank horizon of CBM exploration. The deep coal seam in the Shenmu area is thick and stably distributed. There is lack of understanding of coal reservoir characteristics and gas content in the deep coal seam. This paper aims to investigate the deep CBM at 1755-1764m in the second member of the upper Paleozoic Shanxi Formation (Shan-2 Member) and that at 1815m-1833m in the second member of the upper Paleozoic Taiyuan Formation (Tai-2 Member) with the gas content and other parameters from wireline coring in Well Gu 1. The results show that the Shenmu area has the low-medium rank coal with the high vitrinite content and the medium-high gas-bearing potential. This study provides insight into the gas content of the coal seam deeper than 1500m and establishes a basis for evaluating the 1500m-2000m deep CBM resources within the Ordos Basin.</p>

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Studying of Deep Coal Seam Characteristics to Predict Their Gas-Bearing Potential

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • Shengli Gao,
  • Haojie Chen

摘要

The coal reservoir characteristics are one of key factors controlling coalbed methane (CBM) distribution and enrichment and the CBM development method. Previously, the study of the coal reservoir characteristics in China has been focused on the shallow coal seam (<1500 m), but less attention has been paid to the deep coal reservoir (>1500 m). Thus, the exploration and development of CBM resources is hindered. The CBM exploration and development in the Ordos Basin is concentrated in the coal seam shallower than 800m in the eastern margin and the coal seam has a high exploration level, but the coal seam deeper than 800m in the Shenmu area is the blank horizon of CBM exploration. The deep coal seam in the Shenmu area is thick and stably distributed. There is lack of understanding of coal reservoir characteristics and gas content in the deep coal seam. This paper aims to investigate the deep CBM at 1755-1764m in the second member of the upper Paleozoic Shanxi Formation (Shan-2 Member) and that at 1815m-1833m in the second member of the upper Paleozoic Taiyuan Formation (Tai-2 Member) with the gas content and other parameters from wireline coring in Well Gu 1. The results show that the Shenmu area has the low-medium rank coal with the high vitrinite content and the medium-high gas-bearing potential. This study provides insight into the gas content of the coal seam deeper than 1500m and establishes a basis for evaluating the 1500m-2000m deep CBM resources within the Ordos Basin.