Compositions and Geochemical Characteristics of Light Hydrocarbons in Northern Slope of Tazhong
Received date: 2008-05-06
Revised date: 2008-08-01
Online published: 2008-10-10
The crude oils in the northern slope of Tazhong generated from sapropel type organic materials are characterized by low sulfur and less wax. The contents of benzene and dimethylcyclopentane are low; and hexane, cyclohexane and normal heptane have a high content, which reflects that hydrocarbons are mainly from algae and bacteria. The ratio K1 is around 1, and its distribution is basically consistent with the conclusion reported by Mango about light hydrocarbons, but the K1 value of Tazhong 24 well is a bit high, deviating from the conclusion. Meanwhile, the ratio K2 is generally low， and the average value is 0.21, suggesting the oils present typical marine oils’ characteristics. Heptane value is more than 30% and isoheptane value is also greater than 2.0, which indicates that the oils are in the high mature stage. Noteworthy, the high Heptane and isoheptane values represent that the oils did not undergo intensive biological degradation.
Key words： Northern Slope; Tazhong; Light hydrocarbon; （K1<; SUB>; K2<; SUB>）; Heptane value; Isoheptane value.
WANG Xiang,; ZHANG Min,; LIU Yu-hua, . Compositions and Geochemical Characteristics of Light Hydrocarbons in Northern Slope of Tazhong[J]. Natural Gas Geoscience, 2008 , 19(05) : 713 -717 . DOI: 10.11764/j.issn.1672-1926.2008.05.713
［1］Tissot B P,Welte D H.Petroleum Formation and Occurrence[M].Berlin:Springer-Verlag,1984:1-389.
［2］Mango F D.An invariance in the isoheptanes of petroleum[J].Science,1987,237:514-517.
［3］Thompson K F M.Light hydrocarbons in subsurface sediments[J].Geochim Cosmochim Acta,1979,43:657-672.
［4］Mango F D.The origin of light hydrocarbon in petroleum:A kinetic test of the steady state catalytic hypothesis[J].Geochim Cosmochim Acta,1990,54:1315-1323.
［5］Mango F D.The origin of light cycloalkanes in petroleum[J].Geochim Cosmochim Acta,1990,54:23-27.
［6］Mango F D.The origin of light hydrocarbons in petroleum:Ring preference in the closure of carbocyclic rings[J].Geochim Cosmochim Acta,1994,58(2):895-901.
［7］张敏,林壬子.试论轻烃形成过程中过渡金属的催化作用[J].地质科技情报,1994,13,75-80.
［8］唐友军,刘志刚.苏丹裂谷盆地原油轻烃地球化学特征[J].天然气地球科学,2007,18(5):756-759.
［9］王祥,张敏,黄兴辉.典型海相油和典型煤成油轻烃特征及地球化学意义[J].天然气地球科学,2008,19(1):18-22.
［10］张水昌,张保民,王飞宇,等.塔里木盆地两套海相有效烃源层——Ⅰ：有机质性质、发育环境及控制因素[J].自然科学进展,2001,11（3）：261-268.
［11］刘庆新,张敏,黄兴辉,等.塔里木盆地塔中地区原油轻烃组成特征及其意义[J].天然气地球科学,2006,17(3):319-322.
［12］张敏,张俊.Mango轻烃参数的开发与应用[J].石油勘探与开发,1998,(25):26-28.
［13］朱扬明,张春明.Mango轻烃参数在塔里木原油分类中的应用[J].地球化学,1999,(28):28-29.
［14］朱扬明.稳态催化轻烃成因理论及其应用前景[J].勘探家.1998,(3):7-9.
［15］胡惕麟,戈葆雄.源岩吸附烃和天然轻烃指纹参数的开发和应用[J].石油实验地质,1990,12（4）：375-393.
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