High-resolution seismic studies of gas hydrates west of Svalbard

被引：38
|
作者：
Posewang, J
Mienert, J
机构：
[1] Univ Kiel, SFB 313, D-24118 Kiel, Germany
[2] Univ Tromso, Dept Geol, N-9037 Tromso, Norway
来源：
GEO-MARINE LETTERS | 1999年 / 19卷 / 1-2期
关键词：
D O I：
10.1007/s003670050102
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
A strong bottom-simulating reflection (BSR) with high-amplitude variations is detectable in high-resolution reflection seismic profiles west of Svalbard. Above the BSR, anomalously high velocities up to 1840 m/s, calculated from high-frequency ocean-bottom hydrophone (HF-OBH) data, indicate the existence of gas-hydrated sediments. Below the BSR, a low-velocity layer, interpreted as gas-bearing sediments, shows thickness variations from 12 to 25 m. In addition, two other low-velocity layers clearly containing free gas are detected within the classic hydrate stability zone (HZ) where, a theoretical viewpoint, free gas cannot exist.
引用
收藏
页码：150 / 156
页数：7
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