Research progresses in geological theory and key exploration areas of coal-formed gas in China

作者：Zhe Zhao, Wei Yang, Zhenyu Zhao, Wanglin Xu, Deyu Gong, Hui Jin, Song Wei, Gang Liu, Chunlin ZHANG, Shipeng Huang · 发表于：Petroleum Exploration and Development · 年份：2024 · DOI：10.1016/s1876-3804(25)60551-9 · 被引用次数：18 · 研究领域：Hydrocarbon exploration and reservoir analysis、Methane Hydrates and Related Phenomena、Coal Properties and Utilization

Based on the research progress of the geological theory of coal-formed gas, the contributions of coal-formed gas to the natural gas reserves and production in China and to the development of natural gas in major gas-producing basins are analyzed, and the key favorable exploration zones for coal-formed gas in China are comprehensively evaluated. The following results are obtained. First, coal measures are good gas source rocks, and hydrocarbon generation from coal measure was dominated by gas, followed by oil. Second, a natural gas genetic identification index system based on stable isotopes, light hydrocarbon components, and biomarkers is established. Third, the quantitative and semi-quantitative factors controlling the formation of large gas fields, represented by the indicator of gas generation intensity greater than 20×10 8 m 3 /km 2 , are identified to guide the discovery of large gas fields in China. Fourth, coal-formed gas is the major contributor to the current natural gas reserves and production of China, both accounting for over 55%. The high proportion of coal-formed gas has enabled the Tarim, Sichuan and Ordos basins to be the major gas production areas in China. Fifth, coal rock gas is an important field for future exploration of coal-formed gas, and key zones include the Carboniferous Benxi Formation (Fm) in the Wushenqi-Mizhi area of the Ordos Basin, the Permian Longtan Fm in central-southern Sichuan Basin, the Jurassic Xishanyao Fm in the southern margin and Lu...