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Title: Marine controlled source EM method used for the gas-hydrate investigation in the area off SW Taiwan
Authors: Yunshuen Wang
Shu-Kun Hsu
Chih-Wen Chiang
Rob L. Evans
Chow-Son Chen
Shye-Donq Chiu
Yu-Fang Ma
Song-Chuen Chen
Ching-Hui Tsai
Shiao-Shan Lin
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Keywords: SW Taiwan
Gas hydrate
EM method
Gas seepage
Date: 2014
Issue Date: 2017-02-06T02:54:05Z
Publisher: Journal of Asian Earth Sciences
Abstract: Abstract: Bottom simulating reflectors (BSRs), high methane flux, shallow sulfide/methane interfaces, fluids venting from the seafloor, authigenic carbonates within sediments, methane reefs, and self-biomes are common seafloor features in the area off southwest Taiwan. The geophysical and geochemical signatures of these features suggest a high potential for gas hydrate (GH) reservoirs in the region. The BSRs are typically interpreted as the boundary between free gases and solid hydrate, whereas the upper reaches of the hydrate stability zone and the distribution of gas hydrate in shallow sediments are not well understood. This study shows the first results of a marine controlled-source electromagnetic survey, conducted in the offshore area of SW Taiwan in 2010. The survey aimed to provide electrical resistivity information of the shallow sediments. Three target areas were surveyed: (1) an area to the southeast of the Xiaoliuchiu Island (gas seep G96), (2) an area in the west of the Yung-An Ridge (YAR) and (3) an area in the northwest of the Good Weather Ridge (GWR). In total, fourteen survey lines with a total length of 72 km were completed. Our preliminary results show that relatively high resistivity anomalies occur within pockmarks and at gas seepage sites. The apparent resistivity is estimated to be about 1 Ohm-m higher than background in G96 and YAR sites, while an anomaly up to 2 Ohm-m is found in the GWR. At gas seep site G96, the high resistivity anomaly may be due to the existence of authigenic carbonates; whereas, the high resistivity anomaly in the NW of the GWR site may also be due to the existence of gas hydrate in the shallow seabed. Based on the resistivity anomaly, the gas hydrate saturation is about 16% in the shallow sediments below the pockmark area in the northwest side of the GWR site.
Relation: 92
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40648
Appears in Collections:[應用地球科學研究所] 期刊論文

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