Pathway of Fluid Migration for Gas Hydrate in the Accretionary Wedge of  Manila Subduction Zone, Northeastern South China Sea

Abstract

Abstract:

Great depth of water and thickness of sediment, high rate of deposition and rich content of organic matter in northeastern South China Sea provide the formation of gas hydrate with the necessary gas supply.In addition, the appropriate condition of temperature and pressure and tectonic setting are favorable to the occurrence of gas hydrate.Specially, the fault system in the deformation front and accretionary wedge of Manila subduction zone is proved to be the pathway of gasbearing fluid migration of gas hydrate.Based on the marine geology of northeastern South China Sea or offshore of southwestern Taiwan, multiplechannel seismic profiles and high resolution subbottom 3Dtopographic images interpreted and analyzed, it is found that there are many normal faults in the deformation front, blind faults in the trench axis and (blind) thrusts in the accretionary wedge, which developed into thrust group that divided into the imbricate thrust sheets.The all faults and thrusts make up a fault system, constituting of normal faults, blind faults and (blind) thrusts.The fault system mentioned above not only reflects the process of South China Sea plate diving underneath of Luzon island arc, but also is regarded as the channel of fluid migration, indicating the process of formation, migration and concentration for fluid of gas hydrate in accretionary wedge.

Key words: gas hydrate, accretionary wedge, fault system, migration channel;Manila subduction zone

CLC Number:

P744.4

CHEN Zhi-Hao, Wu Neng-You, LI Jia-Biao. Pathway of Fluid Migration for Gas Hydrate in the Accretionary Wedge of Manila Subduction Zone, Northeastern South China Sea[J]. Geoscience, 2010, 24(3): 441-449.

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Pathway of Fluid Migration for Gas Hydrate in the Accretionary Wedge of Manila Subduction Zone, Northeastern South China Sea

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