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Geochemical Characteristics and gas-to-gas Correlation of Two Leakage-type gas Hydrate Accumulations in the Western Qiongdongnan Basin, South China Sea

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Acta Geologica Sinica(English Edition) 2022年第2期96卷 680-690页

作者： LAI Hongfei QIU Haijun LIANG Jinqiang KUANG Zenggui FANG Yunxin REN Jinfeng LU Jing’an Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China MNR Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China

In recent years,a series of highly saturated leakage-type gas hydrates have been discovered in the western Qiongdongnan Basin(QDNB),South China *** on the molecular compositional and isotopic characteristics of the gas samples relevant to the gas hydrates collected from the two leakage-type gas hydrate accumulations in the GMGS5 and GMGS6 drilling zones,a detailed geochemical gas-to-gas correlation was conducted in this study,in order to further understand the geochemical characteristics and possible hydrocarbon sources of these gas *** natural gas relevant to the gas hydrates in the GMGS5 block is characterized by wet gas(67.96%gas samples from the GMGS6 block exhibit the characteristics of dry gas(99.25%0.9)and lack molecular and carbon isotope *** 40%‒60%of the methane within the gas hydrate is of microbial origin,while the C^(2+)gas components are typical coal-type gas that are derived from thermogenic source rocks or deeply-buried natural gas *** addition,typical in situ primary microbial methane(−80.6‰gas to the gas *** gas-to-gas correlation results show that the hydrate gases within the two leakage-type gas hydrate accumulations in the GMGS5 and GMGS6 blocks are geochemically different,suggesting that they may have been derived from different source *** results further indicate that the deeply-buried thermogenic gas significantly contributed to the shallowly-buried gas hydrates in the western QDNB and multiple effective thermogenic source kitchens provided the hydrocarbon gas in the gas hydrate accumulations.

关键词： gas hydrate gas genetic type hydrocarbon gas source geochemical characteristics

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