GEOTHERMAL FIELD CHARACTERISTICS IN THE AREAS OF GAS HYDRATES DISTRIBUTION
Jin Chunshuang1, Wang Jiyang2, Wang Yongxin3, He Lijuan2
1. Stratigic Research Center for Oil and Gas Resource, Ministry of Land and Resources, Beijing 100034; 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029; 3. International Petroleum Exploration and Development Corporation, Petroleum & Chemical Corp., Beijing 100011
Gas hydrates are located widely in marine sediments and permafrost. Through generalizing the geothermal field characteristics in the areas of gas hydrates distribution where gas hydrates sample of indications were found, we could conclude that the heat flow value was relatively lower in the areas. The thermal conductivity of sediments containing gas hydrates was lower because of the lower thermal conductivity of gas hydrates, and the temperature of core containing gas hydrates was usually lower because of the decomposition of gas hydrates. Therefore, the area with lower heat flow values usually was favourable for gas hydrates. The lower thermal conductivity and temperature of core might indicate the exist of gas hydrates. From geothermal field aspect, gas hydrates might have a better perspective in the Luzon Trough, the Xisha Trough area, the Meigong basin and the Southwest Taiwan Basin in the South China Sea for the lower heat flow values. From the measured results in the South China Sea, we could conclude that there were not gas hydrates in the site 1143, site 1144, site 1146 and site 1148.