Thermochemical sulphate reduction and the generation of hydrogen sulphide and thiols (mercaptans) in Triassic carbonate reservoirs from the Sichuan Basin, China

doi:10.1016/S0009-2541(03)00209-2

	Thermochemical sulphate reduction and the generation of hydrogen sulphide and thiols (mercaptans) in Triassic carbonate reservoirs from the Sichuan Basin, China
	Cai, CF ; Worden, RH ; Bottrell, SH ; Wang, LS ; Yang, CC
刊名	CHEMICAL GEOLOGY
	2003-12-15
卷号	202 期号:1-2 页码:39-57
关键词	H(2)S thermochemical sulphate reduction thiophenes thiols mercaptans stable isotopes natural gas Sichuan Basin
ISSN号	0009-2541
DOI	10.1016/S0009-2541(03)00209-2
文献子类	Article
英文摘要	The Sichuan Basin in China is a sour petroleum province. In order to assess the origin of H(2)S and other sulphur compounds as well as the cause of petroleum alteration, data on H(2)S, thiophene and thiol concentrations and gas stable isotopes (delta(34)S and delta(13)C) have been collected for predominantly gas phase petroleum samples from Jurassic, Triassic, Permian and Upper Proterozoic (Sinian) reservoirs. The highest H(2)S concentrations (up to 32%) are found in Lower Triassic, anhydrite-rich carbonate reservoirs in the Wolonghe Field where the temperature has reached >130 degreesC. delta(34)S values of the H(2)S in the Wolonghe Triassic reservoirs range from +22 to +31 parts per thousand and are close to those of Triassic evaporitic sulphate from South China. All the evidence suggests that the H2S was generated by thermochemical sulphate reduction (TSR) locally within Triassic reservoirs. In the Triassic Wolonghe Field, both methane and ethane seem to be involved in thermochemical sulphate reduction since their delta(13)C values become less negative as TSR proceeds. Thiol concentrations correlate positively with H(2)S in the Triassic Wolonghe gas field, suggesting that thiol production is associated with TSR. In contrast, elevated thiophene concentrations are only found in Jurassic reservoirs in association with liquid phase petroleum generated from sulphur-poor source rocks. This may suggest that thiophene compounds have not come from a source rock or cracked petroleum. Rather they may have been generated by reaction between localized concentrations of H(2)S and liquid range petroleum compounds in the reservoir. However, in the basin, thiophene concentrations decrease with increasing vitrinite reflectance suggesting that source maturity (rather than source type) may also be a major control on thiophene concentration. (C) 2003 Elsevier B.V. All rights reserved.
WOS关键词	OPEN-SYSTEM PYROLYSIS ; ORGANIC-MATTER ; GAS-RESERVOIRS ; GEOCHEMICAL SIGNIFICANCE ; SMACKOVER FORMATION ; HYDROCARBON GASES ; ISOTOPIC EVIDENCE ; OXYGEN ISOTOPES ; NATURAL GASES ; TARIM BASIN
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000187365000004
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/78345]
专题	中国科学院地质与地球物理研究所
通讯作者	Worden, RH
作者单位	1.Univ Liverpool, Jane Herdman Labs, Dept Earth Sci, Liverpool L69 3GP, Merseyside, England 2.CAS, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Univ Leeds, Sch Earth Sci, Leeds LS2 9JT, W Yorkshire, England 4.SW Sichuan Petr Corp, Petr Explorat & Dev Inst, Chengdu, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Cai, CF,Worden, RH,Bottrell, SH,et al. Thermochemical sulphate reduction and the generation of hydrogen sulphide and thiols (mercaptans) in Triassic carbonate reservoirs from the Sichuan Basin, China[J]. CHEMICAL GEOLOGY,2003,202(1-2):39-57.
APA	Cai, CF,Worden, RH,Bottrell, SH,Wang, LS,&Yang, CC.(2003).Thermochemical sulphate reduction and the generation of hydrogen sulphide and thiols (mercaptans) in Triassic carbonate reservoirs from the Sichuan Basin, China.CHEMICAL GEOLOGY,202(1-2),39-57.
MLA	Cai, CF,et al."Thermochemical sulphate reduction and the generation of hydrogen sulphide and thiols (mercaptans) in Triassic carbonate reservoirs from the Sichuan Basin, China".CHEMICAL GEOLOGY 202.1-2(2003):39-57.