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New high-resolution 2D seismic imaging of fluid escape structures in the Makran subduction zone,Arabian Sea

China Geology 2020年第2期3卷 269-282页

作者： Bin Liu Jiang-xin Chen Syed Waseem Haider Xi-guang Deng Li Yang Min-liang Duan Key Laboratory of Marine Mineral Resources Ministry of Natural ResourcesGuangzhou Marine Geological SurveyGuangzhou 510760China Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266071China National Institute of Oceanography Karachi 75600Pakistan Key Laboratory of Submarine Geosciences and Prospecting Techniques MOEOcean University of ChinaQingdao 266100China

Seabed fluid escape is active in the Makran subduction zone,Arabian *** on the new highresolution 2D seismic data,acoustic blanking zones and seafloor mounds are *** blanking zones include three kinds of geometries:Bell-shaped,vertically columnar and tilted *** bellshaped blanking zone is characterized by weak and discontinuous reflections in the interior and upbending reflections on the top,interpreted as gas *** columnar blanking zone is interpreted as side-imaged gas chimneys associated with focused fluid flow and topped by a seafloor anomaly expressed as a localized reflection discontinuity,which may together serve as a vent *** acoustic blanking zone could be induced by accretionary thrust activity and rapid sedimentation surrounding *** mounds occur at the sites of bell-shaped acoustic blanking zone and may be associated with the material *** simulating refectors(BSRs)are widely distributed and exhibit a series of characteristics including diminished amplitude,low continuity as well as local shoaling overlapping with these acoustic blanking *** large amount of gases dissociated from the gas hydrates migrated upwards and then arrived at the near-seafloor sediments,followed by the formation of the gas hydrates and hence the seafloor mound.

关键词： Makran fluid escape structure Gas hydrate Gas chimney Seafloor mound Marine geological survey engineering Pakistan Arabian Sea

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