Great advancement has been made on natural gas hydrates exploration and test production in the northern South China Sea. However, there remains a lot of key questions yet to be resolved, particularly about the mechanisms and the controls of gas hydrates enrichment. Numerical simulaution would play signficant role in addressing these questions. This study focused on the gas hydrate exploration in the Shenhu Area, Northern South China Sea. Based on the newly obtained borehole and multichannel reflection seismic data, the authors conducted an integrated 3D basin modeling study on gas hydrate. The results indicate that the Shenhu Area has favorable conditions for gas hydrate accumulation, such as temperature, pressure, hydrocarbon source, and tectonic setting. Gas hydrates are most concentrated in the Late Miocene strata, particularly in the structual highs between the Baiyun Sag and the Liwan Sag, and area to the south of it . It also proved the existence of overpressure in the main sag of source rocks, which was subject to compaction disequilibrium and hydrocarbon generation. It also shown that the regional fault activity is not conducive to gas hydrate accumulation due to excess gas seepage. The authors conjecture that fault activity may slightly weaken overpressure for the positive effect of hydrocarbon expulsion and areas lacking regional fault activity have better potential.

Zhi-yuan Xie;Jian-gong Wei;Jin-yun Zheng;Zhen Sun;Kun Zhang

Guangzhou Marine Geological Survey,China Geological Survey,Ministry of Natural Resources,Guangzhou 510760,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;Sanya Institute of South China Sea Geology,Guangzhou Marine Geological Survey,Sanya 572025,China;China National Offshore Oil Corporation Ltd.-Shenzhen,Shenzhen 518054,China;Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China;State Key Laboratory of Marine Geology,School of Ocean and Earth Science,Tongji University,Shanghai 200092,China

中国地质（英文）

[1]Zhi-yuan Xie;Jian-gong Wei;Jin-yun Zheng;Zhen Sun;Kun Zhang-.A 3D basin modeling study of the factors controlling gas hydrate accumulation in the Shenhu Area of the South China Sea)[J].中国地质（英文）,2022(02):218-233

simulaution,signficant,structual,Liwan

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