Estimation of gas hydrate saturation in the continental slope of the South China Sea

Author(s): Wang Xiujuan; Wu Shiguo; Guo Xuan; Xu Ning
Author Affiliation(s): Primary:
Chinese Academy of Sciences, Institute of Oceanology, Qingdao, China
PetroChina, Research Institute of Petroleum Exploration and Development, China
Volume Title: Haiyang Dizhi yu Disiji Dizhi Marine Geology & Quaternary Geology
Source: Haiyang Dizhi yu Disiji Dizhi = Marine Geology & Quaternary Geology, 25(3), p.89-95. Publisher: Science Press, Beijing, China. ISSN: 0256-1492
Note: In Chinese with English summary. 28 refs.; illus., incl. 2 tables
Summary: Sedimentary layer velocities are related to gas hydrate saturation, elastic properties and porosity based on the two-phase theory and thermoelastic theory. A qualitative estimate of gas hydrate saturation can be obtained by comparing the theoretical P-wave velocity for full-water saturation to actual P-wave velocity. Based on resistivity, sonic logging, density data and geological data for ODP Site 184, gas hydrates can be found on the continental slope of the South China Sea. Gas hydrate content at ODP Sites 1146 and 1148 in the South China Sea is 25%-30% and 10%-20% of the pore space, respectively. At Site 1148, saturation of the local formation comes to 40%-50%. Normally, the larger the difference between P-wave velocity in the normal sediment layer and that in the gas hydrate-bearing sediment layer, the richer the gas hydrate saturation.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 20 Geophysics, Applied; 29 Economic Geology, Energy Sources; Acoustical logging; Body waves; Continental slope; Elastic waves; Gas hydrates; Leg 184; Marine sediments; North Pacific; Northwest Pacific; ODP Site 1146; ODP Site 1148; Ocean Drilling Program; P-waves; Pacific Ocean; Saturation; Sediments; Seismic waves; South China Sea; Velocity; Well-logging; West Pacific
Coordinates: N185010 N185010 E1163356 E1163356
N192724 N192724 E1161622 E1161622
Record ID: 2010002141
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.