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Distinguishing Cambrian from Upper Ordovician source rocks: Evidence from sulfur isotopes and biomarkers in the Tarim Basin

文献类型：期刊论文

作者Cai, Chunfang1,2; Li, Kaikai1,2; Ma Anlai3; Zhang, Chunming4; Xu, Zhiming5; Worden, Richard H.6; Wu, Guanhui7; Zhang, Baoshou7; Chen, Lixin7
刊名ORGANIC GEOCHEMISTRY
出版日期2009-07-01
卷号40期号:7页码:755-768
ISSN号0146-6380
DOI10.1016/j.orggeochem.2009.04.008
文献子类Article
英文摘要The reported source rocks for the abundant petroleum in the Tarim Basin, China range from Cambrian to Lower Ordovician and/or Upper Ordovician in age. However, the difference between the two groups of source rocks is not well characterized. In this study, pyrite was removed from eleven mature to over mature kerogen samples from source rocks using the method of CrCl2 reduction and grinding. The kerogen and coexisting pyrite samples were then analyzed for delta S-34 values. Results show that the kerogen samples from the Cambrian have delta S-34 values between +10.4 parts per thousand and +19.4 parts per thousand. The values are significantly higher than those from the Lower Ordovician kerogen (delta S-34 of between +6.7 parts per thousand and +8.7 parts per thousand), which in turn are generally higher than from the Upper Ordovician kerogen samples (delta S-34 of between -15.3 and +6.8 parts per thousand). The associated pyrite shows a similar trend but with much lower delta S-34 values. This stratigraphically controlled sulfur isotope variation parallels the evolving contemporary marine sulfate and dated oil delta S-34 values from other basins, suggesting that seawater sulfate and source rock age have an important influence on kerogen and pyrite delta S-34 values. The relatively high delta S-34 values in the Cambrian to Lower Ordovician source rocks are associated with abundant aryl isoprenoids, gammacerane and C-35 homohopanes in the extractable organic matter, indicating that these source rocks were deposited in a bottom water euxinic environment with water stratification. Compared with the Upper Ordovician, the Cambrian to Lower Ordovician source rocks show abundance in C-28 20R sterane, C-23 tricyclic terpanes, 4,23,24-trimethyl triaromatic dinosteroids and depletion in C-24 tetracyclic terpane, C-29 hopane. Thus, delta S-34 values and biomarkers of source rock organic matter can be used for distinguishing the Cambrian and Upper Ordovician source rocks in the Tarim Basin. (C) 2009 Elsevier Ltd. All rights reserved.
WOS关键词CRUDE OILS ; SEDIMENTARY SULFUR ; NW CHINA ; ARYL ISOPRENOIDS ; FLUID INCLUSIONS ; ORGANIC-MATTER ; PALEOZOIC OIL ; PETROLEUM ; PYROLYSIS ; SULFATE
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000267630500002
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; 40839906) ; 40839906) ; 40839906) ; 40839906) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; 40839906) ; 40839906) ; 40839906) ; 40839906) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; 40839906) ; 40839906) ; 40839906) ; 40839906) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; China National Major Basic Development Program "973"(2006CB202304) ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; National Natural Sciences Foundation of China(40573034 ; 40839906) ; 40839906) ; 40839906) ; 40839906)
源URL[http://ir.iggcas.ac.cn/handle/132A11/71010]  
专题中国科学院地质与地球物理研究所
通讯作者Cai, Chunfang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources, Beijing 100029, Peoples R China
3.CENOPEC, Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
4.Yangtze Univ, Dept Geochem, Jinzhou 434023, Hubei, Peoples R China
5.SW Petr Univ, Chengdu 610500, Peoples R China
6.Univ Liverpool, Dept Earth & Ocean Sci, Liverpool L69 3GP, Merseyside, England
7.Tarim Oilfield Co, PetroChina, Kuerle 841000, Xinjiang, Peoples R China
推荐引用方式
GB/T 7714		 Cai, Chunfang,Li, Kaikai,Ma Anlai,et al. Distinguishing Cambrian from Upper Ordovician source rocks: Evidence from sulfur isotopes and biomarkers in the Tarim Basin[J]. ORGANIC GEOCHEMISTRY,2009,40(7):755-768.
APA Cai, Chunfang.,Li, Kaikai.,Ma Anlai.,Zhang, Chunming.,Xu, Zhiming.,...&Chen, Lixin.(2009).Distinguishing Cambrian from Upper Ordovician source rocks: Evidence from sulfur isotopes and biomarkers in the Tarim Basin.ORGANIC GEOCHEMISTRY,40(7),755-768.
MLA Cai, Chunfang,et al."Distinguishing Cambrian from Upper Ordovician source rocks: Evidence from sulfur isotopes and biomarkers in the Tarim Basin".ORGANIC GEOCHEMISTRY 40.7(2009):755-768.

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来源：地质与地球物理研究所

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