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《Acta Sedimentologica Sinica》 2005-01
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Origin and Accumulation Model of Natural Gases in the Dongfang 1-1 Gas Field of the Yinggehai Basin

ZHAO Bi-qiang 1 XIAO Xian-ming 1 HU Zhong-liang 1 HUANG Bao-jia 2 1(State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640) 2(Technology Department, CNOOC Limited, Zhanjiang Guangdong 524057 )  
The Dongfong 1-1 Gas Field of the Yinggehai Basin has great attractiveness because its characteristics of a shallow burial depth, wide variations of gas composition and occurrence in the diapir fault belt. There have been still problems on gas source and gas-filling model for a long period. In this paper, the method of hydrocarbon generation kinetics and carbon isotopic fraction kinetics was applied to some typical source rocks from this basin, and a geological model of gas generation and methane carbon isotopic fraction was suggested. With the combination of the geological and geochemical background of the Dongfong 1-1 Gas Filed, it was believed that the hydrocarbon gases were mainly from the coal measure source rocks in the Meishan Formation, but non-hydrocarbon gas the calcareous shale in the Shanya Formation. The gas pool is quite young, and is related to the diapirism. The hydrocarbon gas was charged after t 1.3 Ma, and CO 2 gas at about 0.1 Ma. The wide variation compositions of the natural gas were controlled by episode charges of gases controlled by diapir fault activities.
【Fund】: 国家自然科学基金资助项目(批准号: 40072043);; 中国科学院广州地球化学研究所前沿领域性项目(GIGCX-04-08).
【CateGory Index】: P618.13
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