碩士 / 國立中央大學 / 地球物理研究所 / 98 / The offshore area of the SW Taiwan is located in the oblique convergence zone between the
northern continental margin of South China Sea and accretionary wedge. In the accretionary
wedge, there are a series of folds and thrust faults. The continental margin consists of a series of
the rifted basin and thick sediments. Our study area is located in the northern Good Weather
Ridge of the lower slope of the wedge. According to the geophysical, geochemical and
geothermal researches off SW Taiwan, abundant gas hydrate may exist. Our main purpose is to
use high-resolution sidescan sonar and sub-bottom profiler to survey the near seafloor features of
the gas hydrate formation off SW Taiwan.
We have collected 13 deep-towed lines in northern Good Weather Ridge. The results show
that many erosion features are found in study area and their morphology are different. Besides,
we modify some thrust faults location on the basic of our results. We also find pockmarks, mud
volcano, authogenic carbonate and acoustic transparent zones. These features imply that there are
abundant gas and fluid paths in this region. Our study area is suitable for forming gas hydrate in
terms of temperature and pressure condition. These evidences indicate that there is high potential
for preserving gas and gas hydrate in our study area. Therefore, we suggest that the material in
acoustic transparent layers which are near the pockmarks may be gas hydrate. After integrating
all data, we construct a 3D model for the gas migration and gas hydrate-bearing in our study
area.
| Identifer | oai:union.ndltd.org:TW/098NCU05134004 |
| Date | January 2010 |
| Creators | Tsung-Yu Shih, 施宗佑 |
| Contributors | Shu-Kun Hsu, 許樹坤 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 110 |
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