Determining the relative abundance of C26-C28 triaromatic steroids in crude oils and its application in petroleum geochemistry
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摘要: 三芳甾烷(TAS)是规则甾烷芳构化产物,其中C26-C28三芳甾烷系列稳定分布于原油和烃源岩有机质中。在常规色谱-质谱分析得到的芳烃馏分(m/z231)质量色谱图上,由于C2620R和C2720STAS异构体共流出而不能确定3种不同碳数三芳甾烷的相对含量,无法建立类似于C27-C29规则甾烷的相对含量三角图,从而使三芳甾烷在油气地球化学中的应用受到限制。以塔里木盆地台盆区古生界代表性原油样品为例,建立了三芳甾烷相对含量三角图,并用北部湾盆地福山凹陷古近系原油进行了验证。结果表明:该区存在2种不同来源的原油,可以划分为2个不同的原油族群,而来自福山凹陷古近系的原油具有不同的C26-C28三芳甾烷组成特征,原油族群的划分也得到其他分子地球化学证据的支持。在高成熟的轻质油和凝析油中,规则甾烷系列由于浓度低而很难由常规的色谱-质谱分析技术进行检测和鉴定,三芳甾烷由于相对较高的热稳定性而稳定存在,因此可代替规则甾烷用于油-油对比和原油族群划分。Abstract: Triaromatic steroids (TAS) may be formed by the aromatization of regular steranes. C26-C28 TAS widely occur in crude oils and source rocks. The C2620R and C2720S TAS typically co-elute with each other in m/z 231 mass chromatograms of aromatic fractions. Therefore, the relative abundance of C26, C27 and C28 TAS cannot be determined by routine GC-MS analysis. A ternary diagram similar to that of C27-C28-C29 regular steranes cannot be established to classify oil families, which leads to the limited use of TAS in petroleum geochemistry. This paper proposed a simple method to estimate the relative abundance of homologues and isomers of TAS on the basis of the distribution patterns, origin and thermal evolution of TAS isomers. Taking representative Paleozoic oil samples from the tectonic region of the Tarim Basin as an example, this paper distinguished two petroleum populations on the ternary diagram of C26-C27-C28 triaromatic steroids determined by routine GC-MS analysis. The oils from the Fushan Sag in the Beibuwan Basin (South China Sea) have different distribution patterns of TAS. The oil family classification is also consistent with that by other molecular markers. For their relatively higher thermal stabilities, triaromatic steroids are generally present in significant abundance in oils and condensates with high maturity. Therefore, this ternary diagram of aromatic steroids is a potential geochemical indicator for oil-to-oil correlation and oil family classification as a substitute for that of regular steranes.
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[1] Peters K E,Walters C C,Moldowan J M.The biomarker guide[M].2nd ed.New York:Cambridge University Press,2005. [2] Riolo J,Hussler G,Albrecht P,et al.Distribution of aromatic steroids in geological samples:Their evaluation as geochemical parameters[J].Organic Geochemistry,1986,10(4/6):981-990. [3] Moldowan J M,Fago F J.Structure and significance of a novel rearranged monoaromatic steroid hydrocarbon in petroleum[J].Geochimica et Cosmochimica Acta,1986,50(3):343-351. [4] Riolo J,Albrecht P.Novel rearranged ring C monoaromatic steroid hydrocarbons in sediments and petroleums[J].Tetrahedron Letters,1985,26(22):2701-2704. [5] Ludwig B,Hussler G,Wehrung P,et al.C26–C29 triaromatic steroid derivatives in sediments and petroleums[J].Tetrahedron Letters,1981,22(34):3313-3316. [6] Moldowan J M,Seifert W K,Gallegos E J.Relationship between petroleum composition and depositional environment of petroleum source rocks[J].AAPG Bulletin,1985,69(8):1255-1268. [7] Picha F J,Peters K E.Biomarker oil-to-source rock correlation in the Western Carpathians and their foreland,Czech Republic[J].Petroleum Geoscience,1998,4(4):289-302. [8] Li Meijun,Wang T G,Lillis P G,et al.The significance of 24-norcho-lestanes,triaromatic steroids and dinosteroids in oils and Cambrian-Ordovician source rocks from the cratonic region of the Tarim Basin,NW China[J].Applied Geochemistry,2012,27(8):1643-1654. [9] 张水昌,王飞宇,张保民,等.塔里木盆地中上奥陶统油源层地球化学研究[J].石油学报,2000,21(6):23-28. Zhang Shuichang,Wang Feiyu,Zhang Baomin,et al.Middle-upper Ordovician source rock geochemistry of the Tarim Basin[J].Acta Petrolei Sinica,2000,21(6):23-28. [10] Zhang Shuichang,Moldowan J M,Li Maowen,et al.The abnormal distribution of the molecular fossils in the pre-Cambrian and Cambrian:Its biological significance[J].Science in China Series D:Earth Sciences,2002,45(3):193-200. [11] Zhang Shuichang,Huang Haiping.Geochemistry of Palaeozoic marine petroleum from the Tarim Basin,NW China:Part 1.Oil family classification[J].Organic Geochemistry,2005,36(8):1204-1214. [12] Mi Jingkui,Zhang Shuichang,Chen Jianping,et al.The distribution of the oil derived from Cambrian source rocks in Lunnan area,the Tarim Basin,China[J].Chinese Science Bulletin,2007,52(S1):133-140. [13] Mackenzie A S,Patience R L,Yon D A,et al.The effect of maturation on the configurations of acyclic isoprenoid acids in sediments[J].Geochimica et Cosmochimica Acta,1982,46(5):783-792. [14] 李美俊,王铁冠,张卫彪.塔河油田奥陶系原油C26降胆甾烷分布特征及地质意义[J].石油实验地质,2015,37(1):64-70. Li Meijun,Wang Tieguan,Zhang Weibiao.Distribution of C26 norcholestanes in Ordovician crude oils from Tahe Oilfield and its geological significance[J].Petroleum Geology & Experiment,2015,37(1):64-70. [15] Zhang S C,Hanson A D,Moldowan J M,et al.Paleozoic oil-source rock correlations in the Tarim Basin,NW China[J].Organic Geochemistry,2000,31(4):273-286. [16] 王铁冠,王春江,何发岐,等.塔河油田奥陶系油藏两期成藏原油充注比率测算方法[J].石油实验地质,2004,26(1):74-79. Wang Tieguan,Wang Chunjiang,He Faqi,et al.Determination of double filling ratio of mixed crude oils in the Ordovician oil re-servoir,Tahe oilfield[J].Petroleum Geology & Experiment,2004,26(1):74-79. [17] Pang Xiongqi,Tian Jun,Pang Hong,et al.Main progress and problems in research on Ordovician hydrocarbon accumulation in the Tarim Basin[J].Petroleum Science,2010,7(2):147-163. [18] Zhu Guangyou,Zhang Shuichang,Su Jin,et al.The occurrence of ultra-deep heavy oils in the Tabei Uplift of the Tarim Basin,NW China[J].Organic Geochemistry,2012,52:88-102. [19] 马安来,张水昌,张大江,等.塔里木盆地塔东2井稠油有机地球化学特征[J].新疆石油地质,2005,26(2):148-151. Ma Anlai,Zhang Shuichang,Zhang Dajiang,et al.Organic geochemistry of TD-2 well in Tarim Basin[J].Xinjiang Petroleum Geology,2005,26(2):148-151. [20] 李美俊,王铁冠,刘菊,等. 北部湾盆地福山凹陷原油充注方向及成藏特征[J].石油实验地质,2007,29(2):172-177. Li Meijun,Wang Tieguan,Liu Ju,et al.Oil charging orientation and accumulation characteristics of oil reservoirs in the Fushan Sag,Beibuwan Basin[J].Petroleum Geology & Experiment,2007,29(2):172-177. [21] 李美俊,王铁冠.油藏地球化学在勘探中的研究进展及应用:以北部湾盆地福山凹陷为例[J].地学前缘,2015,22(1):215-222. Li Meijun,Wang Tieguan.The progress and application of reservoir geochemistry in hydrocarbon exploration:An example from the Fushan Depression,Beibuwan Basin,South China Sea[J].Earth Science Frontiers,2015,22(1):215-222. [22] 陈善斌,甘华军,时阳,等.北部湾盆地福山凹陷烃源岩地球化学特征及地质意义[J].油气地质与采收率,2015,22(1):14-19,25. Chen Shanbin,Gan Huajun,Shi Yang,et al.Geochemical features and geologic significance of source rocks in Fushan Sag,Beibuwan Basin[J].Petroleum Geology and Recovery Efficiency,2015,22(1):14-19,25. [23] Li Meijun,Wang Tieguan,Liu Ju,et al.Total alkyl dibenzothiophenes content tracing the filling pathway of condensate reservoir in the Fushan Depression,South China Sea[J].Science in China Series D:Earth Sciences,2008,51(S2):138-145. [24] Yu Shuang,Pan Changchun,Wang Jinji,et al.Molecular correlation of crude oils and oil components from reservoir rocks in the Tazhong and Tabei uplifts of the Tarim Basin,China[J].Organic Geochemistry,2011,42(10):1241-1262. [25] 张利文,李美俊,杨福林.二苯并呋喃地球化学研究进展及作为油藏充注示踪标志物的化学机理[J].石油与天然气地质,2012,33(4):633-639. Zhang Liwen,Li Meijun,Yan Fulin.Progress of geochemical research on dibenzofuran and its chemical mechanism as molecular tracer for oil charging pathways[J].Oil & Gas Geology,2012,33(4):633-639. [26] Li Meijun,Wang Tieguan,Liu Ju,et al.The Occurrence of olea-nanes in the Beibuwan Basin and its application to the study of maturity and oil-source rock correlation[J].Acta Geologica Sinica (English Edition),2008,82(3):585-595.
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