Gas hydrate accumulation associated with fluid escape structure in the western margin of South China Sea

作     者：Taotao YANG Lin LI Yintao LU Kaiqi YU Zhili YANG Xuefeng WANG Wei LI Taotao YANG;Lin LI;Yintao LU;Kaiqi YU;Zhili YANG;Xuefeng WANG;Wei LI

作者机构：PetroChina Hangzhou Research Institute of GeologyHangzhou 310023China CAS Key Laboratory of Ocean and Marginal Sea GeologySouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China 

出 版 物：《Journal of Oceanology and Limnology》 (海洋湖沼学报（英文）)

年 卷 期：2023年第41卷第3期

页      面：947-958页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 0824[工学-船舶与海洋工程] 

基　　金：Supported by the China Academy of Petroleum Exploration and Development(Nos.2019B-4909,2021DJ2401) Dr.Wei LI is specially funded by the CAS Pioneer Hundred Talents Program(No.Y8SL011001) 

主　　题：gas hydrate fluid-escape structures gas sources bottom simulating reflector(BSR) South 

摘      要：Gas hydrates have been found in the western continental margin of South China Sea,which are revealed by widespread bottom simulating reflectors(BSRs)imaged from a three-dimensional(3D)seismic volume near the Guangle carbonate platform in the western South China ***-escape structures(faults and gas chimneys)are originated below BSR were distinguished.A comprehensive model in three-level structure was proposed to depict the gas hydrate accumulation in the study *** Level 1,regional major faults and gas chimneys provide the first pathways of upward migration of gas near *** Level 2,pervasive polygonal faults in carbonate layer promote the migration of *** Level 3,gases sourced from near-basement accumulate within shallow sediment layers and form gas hydrate above the unit with faults once appropriate temperature and pressure *** gas hydrates in the study area are mainly in microbial origin,and their accumulation occurs only when fluid-escape structures align in all the three *** proposed model of the gas hydrate accumulation in western SCS margin provides new insights for further studies in this poorly studied area.