Characteristics of natural gas hydrate reservoirs on the northeastern slopeof the South China Sea

被引：0

作者：

Zhang, Guangxue ^{[1
,2
]}

Liang, Jinqiang ^{[1
,2
]}

Lu, Jing'an ^{[1
,2
]}

Yang, Shengxiong ^{[1
,2
]}

Zhang, Ming ^{[1
,2
]}

Su, Xin ^{[3
]}

Xu, Huaning ^{[1
,2
]}

Fu, Shaoying ^{[1
,2
]}

Kuang, Zenggui ^{[1
,2
]}

机构：

[1] Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou Marine Geological Survey, Guangzhou, 510075 , Guangdong

[2] Investigation and Research Center for Marine Petroleum and Gas, China Geological Survey, Guangzhou Marine Geological Survey, Guangzhou, 510075 , Guangdong

[3] China University of Geoscience, Beijing

来源：

Natural Gas Industry | 2014年 / 34卷 / 11期

关键词：

Carbonates; China; Exploration drilling; Gas pool; Logging abnormality; Natural gas hydrate; Northeastern slope of South China Sea; Occurrence types; Seismic abnormality;

D O I：

10.3787/j.issn.1000-0976.2014.11.001

中图分类号：

学科分类号：

摘要：

From sample cores obtained in exploration drilling at 13 sites (664-1420 m deep) on the northeastern slope of the South China Sea, we found a large amount of gas hydrates of multiple types, the methane gas content of which is more than 99%. After an integrated analysis of their characteristics, the following findings were obtained. (1) From the multichannel seismic profile, we detected many significant seismic anomalies, including Bottom Simulating Reflection (BSR) and Blanking Zone (BZ), BSR oblique crossing the formation, velocity inversion. (2) The borehole logging data also revealed the characteristics of high electrical resistivity (up to 200 m·Ω) and high acoustic velocities (up to 2700 m/s) of the hydrate-bearing sediments. (3) Seismic and logging anomalies implied that both single-layer and double-layer gas hydrates occurred in the northeastern slope of the South China Sea. (4) The gas hydrate resources of this area are preserved in the sediments like silty clays or limestone grains within the depth of 220 meters below the seafloor (mbsf), where the saturations of gas hydrates range from 45% to 100%. (5) In a natural state, gas hydrates were deposited primarily in the form of massive blocks, thin beds, veins, nodular or disperse particles, among which the first four types were generally formed in the silty clay with coarser grain sizes or in the weak belts near the seafloor with many tracks of the neotectonics. In conclusion, this drilling area was considered to be a promising exploration target of natural gas hydrate resources with about 125 billion m3 because of its favorable features such as a variety of occurrence types, high porous saturation, and high methane concentration. ©, 2014, Natural Gas Industry Journal Agency. All right reserved.

引用

页码：1 / 10

页数：9

共 24 条

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