塔中地区下奥陶统油气地球化学特征及成因

新疆石油地质 ›› 2011, Vol. 32 ›› Issue (3): 272-276.

塔中地区下奥陶统油气地球化学特征及成因

李素梅^1a,1b, 肖中尧², 吕修祥^1a,1b, 张宝收², 张海祖²

1.中国石油大学a.油气资源与探测国家重点实验室;b.地球科学院,北京 102249;
2.中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒 841000

收稿日期:2010-10-19 出版日期:2011-06-01 发布日期:2020-08-14
作者简介:李素梅（1968-）,女,江苏海安人,教授,油气地质地球化学,（Tel）13522768092（E-mail）smli8888@yahoo.com.cn.
基金资助:
国家“973”基金项目（2006CB202308）; 国家自然科学基金项目（40973031）

Geochemical Characteristics and Origin of Hydrocarbons from Lower Ordovician in Tazhong Area, Tarim Basin

LI Su-mei^1a,1b, XIAO Zhong-yao², LV Xiu-xiang^1a,1b, ZHANG Bao-shou², ZHANG Hai-zu²

1. China University of Petroleum, a. State Key Laboratory of Petroleum Resources and Prospecting, b. College of Geosciences, China University of Petroleum, Beijing 102249;
2. Research Institute of Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China

Received:2010-10-19 Online:2011-06-01 Published:2020-08-14

摘要/Abstract

摘要： 通过多种地球化学分析方法,对塔中地区下奥陶统油气地球化学特征与成因进行详细研究,结果表明,下奥陶统原油是以低分子量轻质馏分为主、生物标志物含量极低的高-过成熟原油,以芳烃中含有高-超高丰度的含硫芳烃-二苯并噻吩（DTBs）而显著不同于中上奥陶统等上部层系。依据单体烃碳同位素特征,结合烃类组成与分布,认为下奥陶统原油为来自寒武系-下奥陶统和中上奥陶统的混源油,前者的贡献总体高于后者。下奥陶统原油中较高丰度的硫醇化合物、丰富的四氢噻烷、高含量H2S（近10%）伴生气以及超高丰度的含硫芳烃的存在,表明其经历了硫酸盐热化学还原作用、热化学作用等复杂的油气成藏后作用,这些作用改造了油气藏中的烃类并对油气藏的保存可能产生重要的影响。

关键词: 塔里木盆地, 塔中隆起, 下奥陶统, 生物标志物, 同位素, 油源, 硫酸盐热化学还原作用

Abstract: Multiple approaches are applied to analysis of the characteristics and origin of the oils from the Lower Ordovician in Tazhong area, Tarim basin. The results show that the oils are primarily condensate oil featured by dominant fractions with low molecular weight and much low content of biomarkers such as steroids and terpenoids, suggesting high-overmature crude oils. It is distinguished from that of the overlying Middle-Upper Ordovician by particularly high-super high dibenzothiophene in aromatics. It is suggested that most of the Lower Ordovician oils are mixed-source oils from both the Cambrian-Lower Ordovician and the Middle-Upper Ordovician with a little higher contribution of the former based on chemical compositions of hydrocarbons and compound-specific carbon isotope of n-alkanes in the oils. It is detected that the Lower Ordovician oils are enriched in mercaptan and long chain alkyl thiolanes. These features together with high H2S content in associated gas as well as high dibenzothiophene in the oils indicate that hydrocarbons from the Lower Ordovician should have suffered some alterations such as thermochemical sulphate reduction (TSR) after accumulation to a certain degree. These might have played an essential role in hydrocarbons alteration and reservoir preservation in this area.

Key words: Tarim basin, Tazhong uplift, Lower Ordovician, biomarker, isotope, oil source, TSR

中图分类号:

TE112.111

李素梅, 肖中尧, 吕修祥, 张宝收, 张海祖. 塔中地区下奥陶统油气地球化学特征及成因[J]. 新疆石油地质, 2011, 32(3): 272-276.

LI Su-mei, XIAO Zhong-yao, LV Xiu-xiang, ZHANG Bao-shou, ZHANG Hai-zu. Geochemical Characteristics and Origin of Hydrocarbons from Lower Ordovician in Tazhong Area, Tarim Basin[J]. Xinjiang Petroleum Geology, 2011, 32(3): 272-276.

参考文献

[1] Li Sumei, Pang Xiongqi, Jin Zhijun, et al.Petroleum source in the Tazhong uplift, Tarim basin: new insights from geochemical and fluid inclusion data[J]. Organic Geochemistry, 2010, 41(6):531-553.
[2] Jiang C, Li M, Osadetz K G, et al.Bakken/Madison petroleum systems in the Canadian Williston basin. Part 2: molecular markers diagnostic of Bakken and Lodgepole source rocks[J]. Organic Geochemistry, 2001,32(9):1 037-1 054.
[3] 盛国英,傅家谟,江继刚.膏盐盆地高硫原同中的长链烷基噻吩类化合物[J]. 地球化学, 1986, 2:138-145.
[4] Cai C F, Worden R H, Bottrell S H, et al.Thermochemical sulphate reduction and the generation of hydrogen sulphide and thiols (mercaptans) in Triassic carbonate reservoirs from the Sichuan basin, China[J]. Chem. Geol., 2003, 202(1-2):39-57.
[5] Graham S A, Brassell S, Carroll A R.Characteristics of selected petroleumsource rocks,Xianjiang Uygur Autonomous Region, Northwest China[J]. AAPG Bulletin, 1990,74: 493-512.
[6] 梁狄刚,张水昌,张宝民, 等. 从塔里木盆地看中国海相生油问题[J]. 地学前缘,2000,7(4):534-547.
[7] Zhang S C, Zhang B M, Wang F Y,et al.Middle-Upper Ordovician: the main source of the oils in the Tarim basin[J]. Marine Oil and Gas Geology, 2000,5(1-2): 16-22.
[8] 孙永革, 肖中尧, 徐世平, 等. 塔里木盆地原油中芳基类异戊二烯烃的检出及其地质意义[J]. 新疆石油地质, 2002,25(2): 215-218.
[9] 张水昌, 张保民, 王飞宇, 等. 塔里木盆地两套主力海相烃源岩—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.
[10] 张水昌,梁狄刚,黎茂稳,等. 分子化石与塔里木盆地油源对比[J]. 科学通报,2002,47(增刊): 16-23.
[11] 唐友军,王铁冠. 塔里木盆地塔东2井寒武系稠油分子化石与油源分析[J]. 中国石油大学学报(自然科学版),2007,31(6): 18-22.
[12] 王传刚, 王铁冠, 张卫彪, 等. 塔里木盆地北部塔河油田原油分子地球化学特征及成因类型划分[J]. 沉积学报,2006,24(6): 902-909.
[13] 肖中尧,黄光辉,卢玉红,等. 塔里木盆地塔东2井原油成因分析[J]. 沉积学报, 2004,22(增刊): 66-72.
[14] 肖中尧,卢玉红,桑红,等. 一个典型的寒武系油藏:塔里木盆地塔中62井油藏成因分析[J]. 地球化学, 2005,34(2):155-160.
[15] Li Sumei, Li Maowen, Pang Xiongqi, et al.Origin of crude oils with unusually high dibenzothiophene concentrations in the Tazhong uplift, Tarim basin[J]. Journal of Geochemical Exploration, 2009,101(1): 60.
[16] 姜乃煌,朱光有,张水昌,等. 塔里木盆地塔中83 井原油中检测出2-硫代金刚烷及其地质意义[J]. 科学通报,2007, 52(24): 2 871-2 875.
[17] 戴金星. 中国含硫化氢的天然气分布特征、分类及其成因探讨[J]. 沉积学报, 1985, 3(4): 109-120.
[18] Machel H G.Bacterial and thermochemical sulfatereduction in diagenetic settings: old and new insights[J]. Sediment Geol., 2001, 140(1/2): 143-175.
[19] Kelemen S R, Walters C C, Kwiatek P J, et al.Distinguishing solid bitumens formed by thermochemical sulfate reduction and thermal chemical alteration[J]. Organic Geochemistry, 2008, 39: 1 137-1 143.
[20] 朱光有, 张水昌, 梁英波, 等. 四川盆地高含H₂S 天然气的分布与TSR 成因证据[J]. 地质学报, 2006, 80(8):1 208-1 218.
[21] Orr W L.Changes in sulfur content and isotopic-ratios of sulfur during petroleum maturation—study of Big Horn basin Paleozoic oils[J]. AAPG Bulletin, 1974, 58:2 295-2 318.
[22] Machel H G,Krouse H R,Sassen R.Products and distinguishing criteria of bacterial and thermochemical sulfate reduction[J]. Apply Geochemistry, 1995,10:373-389.