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GEOTECTONICS CHARACTERISTICS AND THEIR RELATION WITH GAS-OIL POOL FORMATION OF THE DONGSHA FAULT-UP LIFTED MASSIF
作者姓名:刘昭蜀  魏常兴  赵岩  杨树康  陈森强
作者单位:South China Sea Institute of Oceanology,Acadenua Sinica,Guangzhou 510301,South China Sea Institute of Oceanology,Acadenua Sinica,Guangzhou 510301,South China Sea Institute of Oceanology,Acadenua Sinica,Guangzhou 510301,South China Sea Institute of Oceanology,Acadenua Sinica,Guangzhou 510301,South China Sea Institute of Oceanology,Acadenua Sinica,Guangzhou 510301
摘    要:The Dongsha fault- uplifted massif (for convenience . Dongsha massif from here on) is located in the northern continental shelf-slope of the South China Sea, where the water depth is 100-400m. The massif is considered to be a part of the large-scale fault-uplifted zone directed NE and separating the Pearl River Mouth Basin into northern and southern graben areas. The sedimentary cover of the Pearl River Mouth Graben consists mainly of a 7000-10000m thick Tertiary system. A large-scale uplift occurred in the Dongsha fault-uplifted zone during Paleocene-Eocene when the lower structural layer (lower Tertiary) existed only in the small depressions of the fault-uplifted zone. The formation and evolution of the Dongsha fault-uplifted zone could be divided into: 1) the basement formation stage (J2-K1); 2) the slowly uplifted stage (K2-E22); 3) the weathering and erosion stage (E23-E31); 4) the integrated subsidence stage (E32-N12) and 5) the last uplifted stage (N13-Q). The formation of the oil and gas pools o

收稿时间:12 March 1991

Geotectonics characteristics and their relation with gas-oil pool formation of the Dongsha fault-uplifted massif
Liu Zhaoshu,Wei Changxing,Zhao Yan,Yang Shukang,Chen Senqiang.GEOTECTONICS CHARACTERISTICS AND THEIR RELATION WITH GAS-OIL POOL FORMATION OF THE DONGSHA FAULT-UP LIFTED MASSIF[J].Chinese Journal of Oceanology and Limnology,1992,10(3):193-203.
Authors:Liu Zhaoshu  Wei Changxing  Zhao Yan  Yang Shukang  Chen Senqiang
Institution:(1) South China Sea Institute of Oceanology, Academia Sinica, 510301 Guangzhou
Abstract:The Dongsha fault- uplifted massif (for convenience . Dongsha massif from here on) is located in the northern continental shelf-slope of the South China Sea, where the water depth is 100-400m. The massif is considered to be a part of the large-scale fault-uplifted zone directed NE and separating the Pearl River Mouth Basin into northern and southern graben areas. The sedimentary cover of the Pearl River Mouth Graben consists mainly of a 7000-10000m thick Tertiary system. A large-scale uplift occurred in the Dongsha fault-uplifted zone during Paleocene-Eocene when the lower structural layer (lower Tertiary) existed only in the small depressions of the fault-uplifted zone. The formation and evolution of the Dongsha fault-uplifted zone could be divided into: 1) the basement formation stage (J2-K1); 2) the slowly uplifted stage (K2-E22); 3) the weathering and erosion stage (E23-E31); 4) the integrated subsidence stage (E32-N12) and 5) the last uplifted stage (N13-Q). The formation of the oil and gas pools of the Dongsha massif was obviously controlled by the formation and evolution of the massif. In the region of the massif, there are good reservoirs and caprocks, many channels for gas-oil migration, and a series of structural and organic reef traps. In addition, because the massif is higher than its adjacent depressions, it became a major place where the gas and oil concentrate from the surrounding depressions. All the above factors are favorable for the formation of large oil-gas pools in the Dongsha fault-uplifted zone.
Keywords:tectonic characteristics  fault-uplifted massif  oil-gas deposit
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