Qualitative assessment of gas hydrate and gas concentrations from the AVO characteristics of the BSR in the Ulleung Basin, East Sea (Japan Sea) SCIE SCOPUS

Cited 18 time in WEB OF SCIENCE Cited 18 time in Scopus
Title
Qualitative assessment of gas hydrate and gas concentrations from the AVO characteristics of the BSR in the Ulleung Basin, East Sea (Japan Sea)
Author(s)
Yi, Bo Y.; Lee, Gwang H.; Horozal, Senay; Yoo, Dong G.; Ryu, Byong J.; Kang, Nyeon K.; Lee, Sung R.; Kim, Han J.
Publication Year
2011-11
Abstract
The presence of gas hydrate in the Ulleung Basin, East Sea (Japan Sea), inferred by various seismic indicators, including the widespread bottom-simulating reflector (BSR), has been confirmed by coring and drilling. We applied the standard AVO technique to the BSRs in turbidite/hemipelagic sediments crosscutting the dipping beds and those in debris-flow deposits to qualitatively assess the gas hydrate and gas concentrations. These BSRs are not likely to be affected by thin-bed tuning which can significantly alter the AVO response of the BSR. The BSRs crosscutting the dipping beds in turbidite/hemipelagic sediments are of low-seismic amplitude and characterized by a small positive gradient, indicating a decrease in Poisson's ratio in the gas-hydrate stability zone (GHSZ), which, in turn, suggests the presence of gas hydrate. The BSRs in debris-flow deposits are characterized by a negative gradient, indicating decreased Poisson's ratio below the GHSZ, which is likely due to a few percent or greater gas saturations. The increase in the steepness of the AVO gradient and the magnitude of the intercept of the BSRs in debris-flow deposits with increasing seismic amplitude of the BSRs is probably due to an increase in gas saturations, as predicted by AVO model studies based on rock physics. The reflection strength of the BSRs in debris-flow deposits, therefore, can be a qualitative measure of gas saturations below the GHSZ. (C) 2010 Elsevier Ltd. All rights reserved.
ISSN
0264-8172
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3800
DOI
10.1016/j.marpetgeo.2010.12.001
Bibliographic Citation
MARINE AND PETROLEUM GEOLOGY, v.28, no.10, pp.1953 - 1966, 2011
Publisher
ELSEVIER SCI LTD
Subject
SEISMIC STRATIGRAPHY; AMPLITUDE; VELOCITIES; REFLECTOR; MARGIN
Keywords
Gas hydrate; BSR; AVO; Tuning-effect; Ulleung Basin; East Sea
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCI LTD
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