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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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Journal of Oceanology and Limnology 2021年第5期39卷 1871-1886页

作者： Bin LIU Waseem Haider SYED Jiangxin CHEN Xiguang DENG Li YANG Leonardo AZEVEDO Minliang DUAN Tingting WU Jinfeng MA Keliang LI Key Laboratory of Marine Mineral Resources Ministry of Natural ResourcesGuangzhou Marine Geological SurveyGuangzhou 510760China National Institute of Oceanography Karachi 75600Pakistan Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China CERENA/Instituto Superior Técnico Lisbon UniversityLisbon 1049-001Portugal Key Lab of Submarine Geosciences and Prospecting Techniques MOE andCollege of Marine GeosciencesOcean University of ChinaQingdao 266100China

To investigate the nature of gas hydrates in the Makran area,new high-resolution geophysical data were acquired between *** data collected comprise multibeam and two-dimensional multi-channel seismic reflection *** multibeam bathymetry data show East-North-East(ENE)ridges,piggy-back basins,canyon and channel systems,and the morphology of the abyssal *** and discontinuous bottom simulating reflectors(BSRs)occur in the piggy-back basins on most of the seismic profiles *** BSRs cut the dipping layers with strong amplitude and reversed *** 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 *** BSRs are highly dynamic and attributed to slumps occurring in the study *** BSRs induced by slumps are located both at deep and shallow depths,responding to the temperature or pressure *** 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 *** results may help to assess the gas hydrate potential within the piggy-back basins and to determine the most promising target ***,results about the abyssal plain BSR may help to locate hydrocarbon reservoirs in the deep ocean.

关键词： gas hydrate-bearing sand-prone sediments double bottom simulating reflector(BSR) multiple BSR canyon channel system abyssal plain

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