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|Title: ||Inverse-ray imaging of gas hydrates along a MCS/OBS profile at the continental slope offshore SW Taiwan|
|Authors: ||Wang T. K.;C. W. Chen;B. Yang;C. S. Lee|
|Contributors: ||NTOU:Institute of Applied Geosciences|
|Issue Date: ||2011-10-20T08:17:38Z
|Publisher: ||EOS Trans. Am. Geophys. Un.|
|Abstract: ||Prevalence of gas hydrates offshore SW Taiwan has been proposed due to lots of bottom-simulated reflectors (BSR) appeared on the seismic data. In this paper, we analyze a MCS/OBS profile with intensive BSR signals at the continental slope of the northern South China Sea. Firstly, MCS data with 160 channels collected by R/V Maurice-Ewing in September 1995 is re-processed through vertical velocity analysis, horizon velocity analysis, and prestack depth migration. Then, OBS data collected by the first Micro-OBS survey from NTOU team in August 2005 is analyzed through travel-time inversion of reflected and refracted arrivals for which the initial model is constructed from the MCS result. Finally, a novel technique of inverse reflected rays by considering both MCS and OBS data is applied for layer-stripping imaging of sedimentary layers. Velocity models imaged from three methods are confirmed the prevalence of BSR at 100-400 m depth below the sea floor along the whole profile. Relatively smooth sedimentary layers are observed below the lower slope of the continent whereas several mud diapers are imaged below the upper slope of the continent. Above the mud diapers, we find gas hydrates with high velocity of about 1.9-2.1 km/s and thickness of about 100 m immediately above the strong BSR. Similarly, near the mud diapers, free gas with low velocity of about 1.4-1.7 km/s and thickness of about 200 m is imaged. Migration of free gas through diapirism may result in lots of gas hydrates accumulated below the upper slope of the continent offshore SW Taiwan.
Inverse-Ray Imaging of Gas Hydrates Along a MCS/OBS Profile at the Continental Slope Offshore SW Taiwan - ResearchGate. Available from: http://www.researchgate.net/publication/253744892_Inverse-Ray_Imaging_of_Gas_Hydrates_Along_a_MCSOBS_Profile_at_the_Continental_Slope_Offshore_SW_Taiwan [accessed Apr 13, 2015].
|Relation: ||P87, OS13F-06.|
|Appears in Collections:||[應用地球科學研究所] 演講及研討會|
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