高邮凹陷原油轻烃地球化学特征及群组划分

doi:10.3981/j.issn.1000-7857.2014.06.006

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Abstract: Gaoyou sag has the greatest potential in oil and gas reserves in Subei Basin. This paper investigates the characteristics of C₆, C₇ light hydrocarbons from nine oilfields in Gaoyou sag, their Mango parameters, the transformation star diagram and maturity degree of crude oils, and makes comparisons among them. C₆ light hydrocarbon is rich in n-hexane, and relatively poor in benzene. Among the components of C₇ light hydrocarbon, the contents of n-heptane, methyl cyclohexane and dimethyl cyclopentane have little difference, indicating the organic matter sources are both sapropelic type and humic type. The average Mango parameter K₁ of the light hydrocarbons is 0.97, suggesting that the oils have similar sedimentary environments. The K₂ of the up petroleum system is large, averaging 0.31, indicative of large terrestrial input. The K₂ of the middle petroleum system is smaller, averaging 0.22, indicative of large water input. Comparison of the light hydrocarbons, their transformation star diagrams, heptane value, and isoheptane index indicate the up petroleum system is in high maturity and has good preservation conditions, while the middle petroleum system is in low maturity, and the down petroleum system is under the mature stage. The analysis of the crude oils in Gaoyou sag and their group division may provide help for oil and gas exploration in this area.

Key words： light hydrocarbons crude oil geochemical characteristics Gaoyou sag group division

Received: 24 July 2013

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	Articles by authors
	SONG Ning
	GUO Haiying
	HOU Pengfei
	YANG Shuaishuai
	WANG Guangli
	HU Jiandong

Cite this article:

SONG Ning,GUO Haiying,HOU Pengfei, et al. Geochemical Characteristics and the Group Division of Light Hydrocarbons in Crude Oil from Gaoyou Sag[J]. journal1, 2014, 32(6): 40-44.

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http://www.kjdb.org/EN/10.3981/j.issn.1000-7857.2014.06.006 OR http://www.kjdb.org/EN/Y2014/V32/I6/40

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