Studies of Seismic Characteristics about Gas hydrate：A Case Study of Line HD152 in the South China Sea

Geoscience ›› 2005, Vol. 19 ›› Issue (1): 33-38.

• Engineering Geology and Environmental Geology • Previous Articles Next Articles

Studies of Seismic Characteristics about Gas hydrate：A Case Study of Line HD152 in the South China Sea

LIU Xue-wei¹, LI Min-feng¹, ZHANG Yu-wen¹, ZHANG Guang-xue²,WU Neng-you², HUANG Yong-yang², WANG Hong-bin^1,2

1 School of Geophysics and Technology Information, China University of Geosciences, Beijing100083,China;
2 Guangzhou Marine Geological Survey, Guangzhou，Guangdong510760,China

Received:2004-11-12 Revised:2005-01-06 Online:2005-01-20 Published:2005-01-20

Abstract

Abstract:

Bottom simulating reflector(BSR) and amplitude blanking zone with high velocity above BSR are the indicators of hydrate. It is difficult to recognize hydrate when BSR isn‘t in existence or amplitude blanking is not obvious because of high hydrate concentration. A useful way of recognizing hydrate is presented to identify the seismic characteriscs of hydrate zone：the high velocity zone of paralleling bottom in the low velocity background is the indicator of hydrate zone,the Poisson's ratio of hydrate zone is lower,and sections of P-wave velocity and S-wave velocity can be used to detect free gas. A case study of line HD152 in the South China Sea is given.

Key words: gas hydrate, seismic data, P-wave velocity, S-wave velocity, Poisson's ratio, the South China Sea

CLC Number:

P631.4
P74

LIU Xue-wei,LI Min-feng,ZHANG Yu-wen,ZHANG Guang-xue,WU Neng-you. Studies of Seismic Characteristics about Gas hydrate：A Case Study of Line HD152 in the South China Sea[J]. Geoscience, 2005, 19(1): 33-38.

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Studies of Seismic Characteristics about Gas hydrate：A Case Study of Line HD152 in the South China Sea

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