TSR origin of sulfur in Permian and Triassic reservoir bitumen, East Sichuan Basin, China

doi:10.1016/j.orggeochem.2010.03.009

	TSR origin of sulfur in Permian and Triassic reservoir bitumen, East Sichuan Basin, China
	Cai, Chunfang 1,2; Li, Kaikai 2; Zhu, Yangming 3; Xiang, Lei 2; Jiang, Lei 2; Tenger 4; Cai, Xunyu 5; Cai, Liulu 2
刊名	ORGANIC GEOCHEMISTRY
	2010-09-01
卷号	41 期号:9 页码:871-878
ISSN号	0146-6380
DOI	10.1016/j.orggeochem.2010.03.009
文献子类	Article
英文摘要	Solid bitumen, H(2)S, pyrite and anhydrite samples from the Lower Triassic Feixianguan Formation and Upper Permian Changxing Formation, and source rock kerogen samples from the Cambrian, Ordovician, Silurian and Permian in the East Sichuan Basin were analyzed for their sulfur content and delta(34)S values, to determine if the measurements were consistent with a thermochemical sulfate reduction (TSR) origin of the produced H(2)S and solid bitumen. The results show that the solid bitumen samples have sulfur contents from 2 6 to 12.5 wt.% and delta(34)S values from +13.4 parts per thousand to +22.1 parts per thousand The delta(34)S values are significantly heavier than those of potential Upper Permian source rock kerogens that average +1.3 parts per thousand (n = 3). suggesting that most of the sulfur in the solid bitumen is derived from isotopically heavy H(2)S of TSR origin (from +12.0 parts per thousand to +13.7 parts per thousand). Interestingly, two gases produced from gas to water transition zones during drill stem testing (DST) show significantly lighter delta(34)S values (+3 3 parts per thousand and +4 1 parts per thousand) than the H(2)S from gas-producing intervals. The isotopically light H(2)S may be genetically linked to fracture-filling isotopically heavy anhydrite with delta(34)S values from +38.5 parts per thousand to +39.6 parts per thousand which are significantly heavier than those of coeval seawater sulfate (+11 8 parts per thousand to +21 7 parts per thousand) as measured for bedded anhydrite. The link may have resulted from reduction of part of the dissolved sulfate by hydrocarbons under sulfate-limited conditions. Source rock kerogens show a secular change in delta(34)S values relative to source rock age A dramatic decrease and then increase in delta(34)S(kerogen) was found toward the Permian/Triassic boundary for the first time in the East Sichuan Basin. (C) 2010 Elsevier Ltd. All rights reserved.
WOS关键词	THERMOCHEMICAL SULFATE REDUCTION ; PUGUANG GAS-FIELD ; ISOTOPIC COMPOSITION ; SOLID BITUMENS ; PETROLEUM-EXPLORATION ; FEIXIANGUAN FORMATION ; SW CHINA ; OIL ; PRECIPITATION ; BACTERIAL
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000282671500005
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/73372]
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 Res, Beijing 100029, Peoples R China 3.Zhejiang Univ, Dept Earth Sci, Hangzhou 310027, Zhejiang, Peoples R China 4.CENOPEC, Inst Petr Explorat & Dev, Wuxi, Jiansu Province, Peoples R China 5.CENOPEC, Oilfield Dept, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Cai, Chunfang,Li, Kaikai,Zhu, Yangming,et al. TSR origin of sulfur in Permian and Triassic reservoir bitumen, East Sichuan Basin, China[J]. ORGANIC GEOCHEMISTRY,2010,41(9):871-878.
APA	Cai, Chunfang.,Li, Kaikai.,Zhu, Yangming.,Xiang, Lei.,Jiang, Lei.,...&Cai, Liulu.(2010).TSR origin of sulfur in Permian and Triassic reservoir bitumen, East Sichuan Basin, China.ORGANIC GEOCHEMISTRY,41(9),871-878.
MLA	Cai, Chunfang,et al."TSR origin of sulfur in Permian and Triassic reservoir bitumen, East Sichuan Basin, China".ORGANIC GEOCHEMISTRY 41.9(2010):871-878.