Please use this identifier to cite or link to this item:
|Title: ||Imaging of Gas Hydrates in the Northernmost South China Sea from Multi-Component OBS Data|
|Authors: ||Wang T. –K;C. -S. Lee;C. -S. Liu|
|Contributors: ||NTOU:Institute of Applied Geosciences|
|Issue Date: ||2011-10-20T08:18:56Z
|Publisher: ||European Association of Geoscientists & Engineers|
|Abstract: ||More than 100 Ocean-bottom seismometers (OBS), with a relatively dense spacing of about 500-1000 m, were deployed and recovered for exploring gas hydrates in the northernmost South China Sea. P-wave velocity models have been determined from travel-time inversion of hydrophone and vertical components of OBS data whereas the Poisson’s ratio models are determined from shear waves, converted at the sea floor and the bottom-simulating reflector (BSR), selected from two horizontal components of OBS data. A layer-stripping and Monte-Carlo inversion of the blocky model of the Poisson’s ratio is applied. Furthermore, based on P-wave velocity, Poisson’s ratio and rock physics of the three-phase effective medium, saturation of gas hydrates is estimated. The results show that hydrates are imaged by a relatively low Poisson’s ratio (0.44-0.46) below anticlines and free gas is characterized by a relatively high Poisson’s ratio (0.485-0.5) beneath most of the BSR. We also observe that saturation of hydrates (30%) in the passive continental margin of the South China Sea is greater than that (15-25%) in the active accretionary wedge off SW Taiwan.|
|Appears in Collections:||[應用地球科學研究所] 演講及研討會|
Files in This Item:
There are no files associated with this item.
All items in NTOUR are protected by copyright, with all rights reserved.