Distinct BSRs and their implications for natural gas hydrate formation and distribution at the submarine Makran accretionary zone

Bin LIU; Keliang LI; Waseem Haider SYED; Jiangxin CHEN; Xiguang DENG; Li YANG; Leonardo AZEVEDO; Minliang DUAN; Tingting WU; Jinfeng MA

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Distinct BSRs and their implications for natural gas hydrate formation and distribution at the submarine Makran accretionary zone

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To investigate the nature of gas hydrates in the Makran area,new high-resolution geophysical data were acquired between 2018-2019.The data collected comprise multibeam and two-dimensional multi-channel seismic reflection data.The multibeam bathymetry data show East-North-East(ENE)ridges,piggy-back basins,canyon and channel systems,and the morphology of the abyssal plain.Continuous and discontinuous bottom simulating reflectors(BSRs)occur in the piggy-back basins on most of the seismic profiles available.The BSRs cut the dipping layers with strong amplitude and reversed polarity.Discontinuous BSRs indicate a transition along a dipping high-permeable sand layers from gas-rich segment to the gas hydrate-bearing segment and sugge st alternating sediments of fine and relatively coarse grain size.Double BSRs are highly dynamic and attributed to slumps occurring in the study area.The BSRs induced by slumps are located both at deep and shallow depths,responding to the temperature or pressure variation.For the first time,BSRs are observed in the abyssal plain of the Makran area,being associated with anticline structures,which do not show large spatial continuity and are strongly conditioned by structural conditions such as anticlines and fluid migration pathways,including deep fault,gas chimney,and high-permeable sedimentary layer.Our results may help to assess the gas hydrate potential within the piggy-back basins and to determine the most promising target areas.Moreover,results about the abyssal plain BSR may help to locate hydrocarbon reservoirs in the deep ocean.

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《中国海洋湖沼学报（英文版）》 |2021年第5期|1871-1886|共16页
作者
Bin LIU; Keliang LI; Waseem Haider SYED; Jiangxin CHEN; Xiguang DENG; Li YANG; Leonardo AZEVEDO; Minliang DUAN; Tingting WU; Jinfeng MA;
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Key Laboratory of Marine Mineral Resources Ministry of Natural Resources Guangzhou Marine Geological Survey Guangzhou 510760 China;

Key Laboratory of Marine Mineral Resources Ministry of Natural Resources Guangzhou Marine Geological Survey Guangzhou 510760 China;

National Institute of Oceanography Karachi 75600 Pakistan;

Key Laboratory of Gas Hydrate Ministry of Natural Resources Qingdao Institute of Marine Geology Qingdao 266071 China;

Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237 China;

Key Laboratory of Marine Mineral Resources Ministry of Natural Resources Guangzhou Marine Geological Survey Guangzhou 510760 China;

Key Laboratory of Marine Mineral Resources Ministry of Natural Resources Guangzhou Marine Geological Survey Guangzhou 510760 China;

CERENA/Instituto Superior Técnico Lisbon University Lisbon 1049-001 Portugal;

Key Laboratory of Gas Hydrate Ministry of Natural Resources Qingdao Institute of Marine Geology Qingdao 266071 China;

Key Lab of Submarine Geosciences and Prospecting Techniques MOE and College of Marine Geosciences Ocean University of China Qingdao 266100 China;

Key Laboratory of Marine Mineral Resources Ministry of Natural Resources Guangzhou Marine Geological Survey Guangzhou 510760 China;

Key Laboratory of Marine Mineral Resources Ministry of Natural Resources Guangzhou Marine Geological Survey Guangzhou 510760 China;

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Distinct BSRs and their implications for natural gas hydrate formation and distribution at the submarine Makran accretionary zone

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