Gas hydrate associated with mud diapirs in southern Okinawa Trough |
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| Authors: | Xu Ning Wu Shiguo Shi Buqing Lu Bing Xue Liangqing Wang Xiujuan Jia Ying |
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| Institution: | aChina National Oil and Gas Exploration and Development Corporation, CNODC/CNPC, No.6-1 Fuchengmen Beidajie, Beijing 100034, Xicheng District, China;bKey Laboratory of Marine geology & Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;cEarth Sciences & Geophysic Information, China University of Petroleum, Qingdao 266555, China |
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| Abstract: | Many mud diapirs have been recognized in southern Okinawa Trough by a multi-channel seismic surveying on R/V KEXUE I in 2001. Gas hydrates have been identified, by the seismic reflection characteristics, the velocity analysis and the impedance inversion. Geothermal heat flow around the central of the mud diapir has been determined theoretically by the Bottom Simulating Reflectors (BSRs). Comparing the BSR derived and the measured heat flow values, we infer that the BSR immediately at the top of the mud diapirs indicate the base of the saturated gas hydrate formation zone (BSGHFZ), but not, as we ordinarily know, the base of the gas hydrate stability zone (BGHSZ), which could be explained by the abnormal regional background heat flow and free gas flux associated with mud diapirs. As a result, it helps us to better understand the generation mechanism of the gas hydrates associated with mud diapirs and to predict the gas hydrate potential in the southern Okinawa Trough. |
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| Keywords: | Mud diapir Gas hydrate Seismic stratigraphy Seismic attribute Okinawa Trough |
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