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Seismic Properties Study of Gas Hydrate in Deep Sea using Numerical Modeling Technique  

Shin, Sung-Ryul (Korea Maritime University, Dept. of Energy & Resources Eng.)
Yeo, Eun-Min (Korea Maritime University, Dept. of Energy & Resources Eng.)
Kim, Chan-Su (Korea Maritime University, Dept. of Energy & Resources Eng.)
Park, Keun-Pil (Korea Institute of Geoscience and Mineral Resources, Petroleum & Marine Resources Div.)
Lee, Ho-Young (Korea Institute of Geoscience and Mineral Resources, Petroleum & Marine Resources Div.)
Kim, Young-Jun (Korea Institute of Geoscience and Mineral Resources, Petroleum & Marine Resources Div.)
Publication Information
Geophysics and Geophysical Exploration / v.9, no.2, 2006 , pp. 139-147 More about this Journal
Abstract
We had conducted a numerical modeling to investigate seismic properties of gas hydrate with field parameters acquired over the East sea in 1998. We used a 2-D staggered grid finite difference method to generate synthetic elastic seismograms for multi-channel seismic survey, OBC (Ocean Bottom Cable) survey and VCS (Vertical Cable Seismic) survey. The results of this study showed that the method using staggered grid yielded stable results and could be used to seismic imaging. We could find out the high amplitude anomaly and the phase reversal phenomenon of reflection wave at interface between the gas hydrate layer and free gas layer such a BSR (Bottom Simulating Reflector) which is the evidence for existence of gas hydrate in seismic reflection data. And we computed the reflection coefficients at the incident angles corresponding to offset distance with the synthetic seismograms. The reflection coefficients acquired from the numerical modeling were nearly consistent with the reflection coefficient computed by Shuey's equation.
Keywords
Gas hydrate; Seismic numerical modeling; Staggered grid; BSR; Reflection coefficient;
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