Resistivity characteristics of core samples containing natural gas hydrates in Shenhu Area,the South China Sea
Chen Yufeng1, Liang Deqing2, Wu Neng-you3
1. Department of Chemical Engineering and Resource Recycling, Wuzhou College, Wuzhou, Guangxi 543000, China; 2. Key Laboratory of Natural Gas Hydrate, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China; 3. Key Laboratory of Natural Gas Hydrate, Qing-dao Institute of Marine Geology, Geological Survey of China, Ministry of Natural Resources, Qingdao, Shandong 266071, China
Abstract:The relationship between gas hydrate saturation (Sh) and sediment resistivity is the key to quantitatively estimate hydrate resource within submarine sediments in Shenhu Area,the South China Sea.The resistivity of core samples from the site SH7B in the area is measured during the natural gas hydrate formation by the temperature oscillations.At the temperature of 3.6℃,the methane became gas hydrate.The sample resistivity is 1.220 Ω·m at the 100% water saturation,and it increases to 2.150 Ω·m at the 37.7% hydrate saturation.Gas hydrate may first be cemented on grain particle of the unconsolidated core and the resistivity increases rapidly when Sh is less than 18.0%.And it contacts possibly with sediment frame or loads in the pore fluid in the range of Sh 18.0%~25.0%.Finally it may be cemented on sediment particles when Sh exceeds 25.0%.As a result,the pore throat may be cemented with hydrate and a part of pore fluid cannot convert into hydrate.
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