首页|Deep-large faults controlling on the distribution of the venting gas hydrate system in the middle of the Qiongdongnan Basin,South China Sea

Deep-large faults controlling on the distribution of the venting gas hydrate system in the middle of the Qiongdongnan Basin,South China Sea

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
Many locations with concentrated hydrates at vents have confirmed the presence of abundant thermogenic gas in the middle of the Qiongdongnan Basin(QDNB).However,the impact of deep structures on gas-bearing fluids migration and gas hydrates distribution in tectonically inactive regions is still unclear.In this study,the authors apply high-resolution 3D seismic and logging while drilling(LWD)data from the middle of the QDNB to investigate the influence of deep-large faults on gas chimneys and preferred gas-escape pipes.The findings reveal the following:(1)Two significant deep-large faults,F1 and F2,developed on the edge of the Songnan Low Uplift,control the dominant migration of thermogenic hydrocarbons and determine the initial locations of gas chimneys.(2)The formation of gas chimneys is likely related to fault activation and reactivation.Gas chimney 1 is primarily arises from convergent fluid migration resulting from the intersection of the two faults,while the gas chimney 2 benefits from a steeper fault plane and shorter migration distance of fault F2.(3)Most gas-escape pipes are situated near the apex of the two faults.Their reactivations facilitate free gas flow into the GHSZ and contribute to the formation of fracture-filling hydrates.

Venting gas hydratesDeep-large faultsGas chimneyGas-escape pipesHigh-resolution 3D seismicLogging while drillingQiongdongnan BasinSouth China Sea

Jin-feng Ren、Hai-jun Qiu、Zeng-gui Kuang、Ting-wei Li、Yu-lin He、Meng-jie Xu、Xiao-xue Wang、Hong-fei Lai、Jin Liang

展开 >

National Engineering Research Center of Gas Hydrate Exploration and Development,Guangzhou 511458,China

Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou 511458,China

China Geological Survey,Ministtry of Natural Resources,Beijing 100037,China

国家自然科学基金国家自然科学基金Director Research Fund Project of Guangzhou Marine Geological Survey国家重点研发计划Guangdong Major Project of Basic and Applied Basic Research中国地调局项目China National Gas Hydrate Drilling Expedition

42376221422760832023GMGSJZJJ000302021YFC28009012020B030103003DD20230064GMGS8

2024

10.31035/cg2023086

中国地质(英文)
中国地质调查局,中国地质科学院

中国地质(英文)

CSTPCD
ISSN：2096-5192
年,卷(期)：2024.7(1)
  • 8