FORMING MECHANISM OF HYDROCARBON POOLS IN TAHE OILFIELD OF THE NORTHERN TARIM BASIN
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摘要: 大民屯凹陷原油以高含蜡著称,对沙河街组低成熟烃源岩抽提物的高温气相色谱分析揭示了高分子量化合物的组成与分布特征。研究表明有机质的原始组成和沉积环境是形成高分子量烃类的主要控制因素。有机质含量较高的烃源岩(TOC>3.0%)显微组成中类脂组的含量较高,岩石抽提物不仅总量较高,而且含蜡量较高,但在蜡的组成上以中分子量的显晶蜡为主,形成于弱还原环境。有机质含量较低的烃源岩(TOC<2.0%)显微组成中镜质组的含量较高,岩石抽提物含量及含蜡量均较低,但在蜡的组成上高分子量的微晶蜡相对富集,形成于弱氧化环境。除正构烷烃外,岩石抽提物中还检出了含量较高的异构烷烃。Abstract: High temperature GC analysis of high molecular weight hydrocarbons (HMWHCs) was performed on marginal mature source rock extractions from the Shahejie Formation, Damintun Depression, whose oil is particularly rich in wax. Organic composition and depositional environment are the main control factors for the formation of HMWHCs. The main maceral components in organic-rich samples (TOC>3.0%) are liptinite and exinite, deposited in relatively reduced environment. They contain high amount of waxes but dominated by macrocrystalline ones (centred at C29). Those organic-lean samples (TOC<2.0%) are dominated by vitrinite, deposited in a slightly oxidized environment. They contain lower amount of waxes but relatively rich in microcrystalline components. Besides normal alkanes, high amounts of branched/cyclic hydrocarbons have been detected in the region above C50.
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[1] Hedberg H D. Significance of high wax oils with respect to genesis of petroleum[J]. Am Assoc Petrol Geol Bull,1968,52:736-750. [2] Tissot B P, Welte D H. Petroleum formation and occurrence[M], 2nd Ed. Springer-Verlag, 1984. [3] Tegelaar E W, Matthezing R M, Jansen J B H, Horsfield B, de Leeuw J W. Possible origin of n-alkanes in high wax crude oils[J]. Nature, 1989,342:529-531. [4] Del Rio J C, Philp R P. Nature and geochemistry of high weight hydrocarbons (above C40) in oils and solid bitumens[J]. Org Geochem,1992,18(4):541-553. [5] Del Rio J C, Philp R P. Field ionization mass spectrometric study of high molecular weight hydrocarbons in a crude oil and a solid bitumen[J]. Org. Geochem.,1999, 30:279-286. [6] Carlson R M K, Teerman S C, Moldowan J M, Jacobson S R, Chan E I, Dorrough K S, Seetoo W C, Mertani B. High temperature gas chromatography of high wax oils[A]. Indonesian Petroleum Association, 22nd Annual Convention Proceedings[C]. Jakarta, Indonesian, 1993. 483-507. [7] Musser B, Kilpatrick P K. Molecular characterization of wax isolated from a variety of crude oils[J]. Energy & Fuels, 1998,12:715-725. [8] Thanh N X, Hsieh M, Philp R P. Waxes and asphaltenes in crude oils[J]. Org Geochem, 1999,30: 119-132. [9] 郑容植,王桂珍.大民屯凹陷高凝油低凝油特征及其分布规律[J],石油实验地质,1988,10(3): 256-267. [10] 葛泰生,陈义贤. 中国石油地质志(卷三)——辽河油田[M]. 北京:石油工业出版社,1993. [11] Tong X, Huang Z. Buried-hill discoveries of the Damintun Depression in North China[J]. Am Assoc Petrol Geol Bull,1991, 75:780-794. [12] Huang Y, Geng A, Fu J, Sheng G, Zhao B, Cheng Y, Li M. The inverstigation of characteristics of biomarker assemblages and their precursors in Damintun ultra-high wax oils and related source rocks[J]. Org Geochem, 1992,9:29-39. [13] Didyk B M, Simoneit B R T, Brassel S C, Eglinton G. Organic geochemical indicators of paleoenvironmental conditions of sedimentation[J]. Nature,1978,272:216-222. [14] Mello M R, Maxwell J R. Organic geochemical and biological marker characterization of source rocks and oils from lacustrine environments in the Brazilian Continental Margin[A]. Katz B J Lacustrine Basin Exploration[C]. AAPG Memoir 50.1990.77-97. [15] Philp P R. Geochemical characteristics of oils derived predominantly from terrigenous source materials[A]. Scott A C, Fleet A J. Coal and coal-bearing strata as oil-prone source rocks?[C]. Geological Society Special Publication, London, 1990.71-91. [16] Fu J, Sheng G. Biological marker composition of typical source rocks and related crude oils of terrestrial origin in the People's Republic of China: a review[J]. Appl Geochem, 1989,4:13-22. [17] Hughes W B, Holba A G, Dzou L I P. The ratios of dibenzothiophene to phenanthrene and pristane to phytane as indicators of depositioal environment and lithology of petroleum source rocks[J]. Geochimica et Cosmochimica Acta,1995,59: 3581-3598.
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