摘要：Currently, there are very limited methods for direct gas-source rock correlation studies. Herein, we applied sulfur isotope analyses of individual volatile organic sulfur compounds (VOSC) in natural gases and dibenzothiophenes (DBTs) in the associated oils from Ordovician reservoirs in Shunbei and Tahe areas of the Tarim Basin, and coupled them with characteristics of gaseous hydrocarbons to elucidate gas-source correlation and secondary alterations in the reservoirs. The results show that the VOSCs in some of the gas samples have reached isotopic equilibrium with the associated H2S but with distinct sulfur isotope compositions, suggesting that they may be related to the thermal cracking of kerogen and/or oil, or altered by thermochemical sulfate reduction (TSR). The 未34S values of VOSCs in the gases unaffected by TSR range from +14.9 to +21.3鈥?, which are correlated well with the Cambrian source rock kerogen and DBTs from its derived oils, indicating the gases may have a Cambrian source. Few gas samples from the Tahe area exhibit higher 未34S values of VOSCs (from +22.9 to +31.6鈥?) but with no evidence for TSR alteration in the associated oils. This suggests that exogenous TSR-H2S was charged into the reservoirs, and altered the 未34S values of the VOSCs. The sulfur isotopes of VOSCs in a gas sample range from +27.3 to +34.8鈥? which are close to the Cambrian anhydrite but are not in isotopic equilibrium with the associated H2S. This suggests that the VOSCs have interacted with recently migrated H2S produced by TSR and the increasing concentrations of H2S might have prevented the system from reaching isotopic equilibrium with the VOSC. Thus, VOSC can provide an additional layer of information when interpreting gas generation and migration processes within a complex basin such as the Tarim Basin. 漏 2024 Elsevier Ltd

ISSN号：0264-8172

卷、期、页：卷169

发表日期：2024-11-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,地学领域高质量科技期刊分级目录（国外T1）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Marine and Petroleum Geology

参与作者：王道伟,Kutuzov, Ilya,Zhang, Hao,Cao, Zicheng,Wang, Qinghua,Amrani, Alon

第一作者：蔡春芳

论文类型：期刊论文

论文概要：王道伟,Kutuzov, Ilya,Zhang, Hao,Cao, Zicheng,Wang, Qinghua,Amrani, Alon,蔡春芳，Application of sulfur isotopes of volatile organic sulfur compounds to determine the natural gas secondary alterations and possible sources in the Tarim Basin, NW China，Marine and Petroleum Geology，2024，卷169

论文题目：Application of sulfur isotopes of volatile organic sulfur compounds to determine the natural gas secondary alterations and possible sources in the Tarim Basin, NW China