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《Petroleum Exploration and Development》 2005-04
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Natural gas accumulation and geochemical characteristics in Yinggehai-Qiongdongnan Basin, South China Sea

DING Wei-wei 1 , PANG Yan-ming 2 , HU An-ping 2 ( 1. College of Resources and Information, China University of Petroleum, Beijing 102249, China; 2. Department of Earth Science, Zhejiang University, Zhejiang 310027, China)  
The accumulating conditions and geochemical characteristics of the natural gas in Yinggehai-Qiongdongnan Basin were studied, which disclosed that the natural gas accumulation was favorable in the basin. The high-temperature environment accelerates the thermal evolution of the organic matters and shortens the maturation period of the source rocks. The reservoir-cap combination is desirable in that the porous reservoir benefits the gases reserving and the overpressured cap provides excellent sealing ability. Multi-types of traps develop in the basin. Tectonic activities open new faults as pathways for the natural gas migration. And the source rocks expel gas in late period, which prevents the gas field from depletion due to long-term diffusion. Isotopic compositions show that the gases in Yinggehai-Qiongdongnan Basin are generally coal gases with heavy alkane carbon isotopic compositions. Some biogenetic gases exist in the natural gases of Yinggehai Basin due to the episodic injection of hydrocarbon fluids. The CO_ 2 gas in Yinggehai Basin is from organic crust origin, inorganic crust origin, and crust-mantle origin. The CO_ 2 gas in Qiongdongnan Basin is of inorganic origin as crust origin and mantle origin.
【Fund】: 国家重点基础研究发展规划“973”项目(G2000046704)
【CateGory Index】: P618.13
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