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AVO Analysis on Gas Hydrates in the Continental Margin off the South shetland Islands, Antarctica

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Title
AVO Analysis on Gas Hydrates in the Continental Margin off the South shetland Islands, Antarctica
Other Titles
남극 남쉐틀랜드 군도 대륙주변부의 가스수화물 AVO 반응분석
Authors
Nam, SangHeon
Jin, Young Keun
구경모
Park, Minkyu
Hong, Jong Kuk
Lee, Jung Mo
Subject
Environmental Sciences & Ecology
Keywords
seismic data; AVO analysis; BSR; gas hydrates; free gas
Issue Date
2006
Citation
Nam, SangHeon, et al. 2006. "AVO Analysis on Gas Hydrates in the Continental Margin off the South shetland Islands, Antarctica". Korean Geophysical Society, 9(4): 417-426.
Abstract
Geophysical survey has been conducted on the continental margin off the South Shetland Islands aboard R/V Onnuri of KORDI in 1992/1993. About 800-line km of 96-channel reflection data have been acquired. On the seismic section, BSR with strong reflectivity and negative polarity has been found at 700 ms below the sea bottom. BSR is considered as the base of gas hydrates and AVO analysis was performed to study physical properties along BSR. True amplitude recovery and surface consistence amplitude were applied to seismic data and angle gathers were obtained. AVO gradient and AVO intercept are calculated on every CDP gather. Section of AVO intercept show strong reflectivity and negative polarity on BSRs and stronger continuity of BSR than stacked section. Cross plot of P-G indicates that the lower layer below BSR is filled with free gas.
URI
http://repository.kopri.re.kr/handle/201206/6628
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