A preliminary study of gas hydrates in the Dongsha region, northern South China Sea

Author(s): Song Haibin; Geng Jianhua; Wang Howking; Zhang Wensheng; Fang Yinxia; Hao Tianyao; Jiang Weiwei
Author Affiliation(s): Primary:
Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing, China
Other:
Tongji University, China
Hamburg University, Federal Republic of Germany
China Bureau of Oceanography, China
Volume Title: Diqiu Wulixue Bao Acta Geophysica Sinica
Source: Diqiu Wulixue Bao = Acta Geophysica Sinica, 44(5), p.687-695. Publisher: Science Press, Beijing, China. ISSN: 0001-5733 CODEN: TCWHAG
Note: In Chinese with English summary. 16 refs.; illus., incl. sketch map
Summary: Using seismic, sonic logging and geothermal data, the distribution characteristics of gas hydrates in the Dongsha region in the north of the South China Sea were studied. Bottom simulating reflectors (BSR) and amplitude blanking zones were discovered in the seismic profiles. High-velocity intervals and velocity reversals were distinguished in the sonic logging curve. The BSR depth is compared with the thickness of the gas hydrate stability zone based on thermal gradient data. The depth of the BSR is in agreement with that obtained at ODP Sites 1144 and 1148, which are 654 and 475 meters below the sea floor, respectively. The top of the amplitude blanking zone may be related to gas hydrate-bearing strata in the region near ODP Site 1144 which is about 450 meters below the sea floor.
Year of Publication: 2001
Research Program: ODP Ocean Drilling Program
Key Words: 20 Geophysics, Applied; 29 Economic Geology, Energy Sources; Acoustical logging; Bottom-simulating reflectors; Dongsha Rise; Gas hydrates; Geophysical methods; Geophysical profiles; Geophysical surveys; Leg 184; Natural gas; North Pacific; Northwest Pacific; ODP Site 1144; ODP Site 1148; Ocean Drilling Program; Offshore; Pacific Ocean; Petroleum; Petroleum exploration; Seismic methods; Seismic profiles; South China Sea; Surveys; Well-logging; West Pacific
Coordinates: N200311 N200311 E1172508 E1172508
N185010 N185010 E1163356 E1163356
Record ID: 2009038653
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