摘要：Uncertainty about the source of the oils from the Halahatang region of the Tabei Uplift, Tarim Basin (NW China) presents an ongoing challenge to exploration. Previous analyses of several Halahatang oils showed isotopic (δ13C 27-C29 steranes) more typical of regional Ordovician source rocks than the Cambrian rocks that are the predominant source of petroleum of the Tarim Basin, supporting prospects for a second major regional oil source. In pursuit of a more definitive source assignment of Halahatang oils and further insight into their depositional environment and charge history, a detailed molecular appraisal of the aromatic hydrocarbon composition of 27 marine oils and complementary stable sulfur and carbon isotopic analyses were conducted. The oils were from different Halahatang wells resolved into three separate block groups, with variations to the extent molecular and isotopic data was influenced by secondary alteration (i.e., thermal maturity, biodegradation and, possibly, minor thermochemical sulfate reduction) evident among the groups. The major aromatic products of all oils were alkylated naphthalenes, phenanthrenes, dibenzothiophenes and trace levels of thiadiamondoids were detected in a few Group II and III oils. Aryl isoprenoids, typical biomarkers of an euxinic depositional environment, were also conspicuous in lower maturity Group I and II oils (Rc 34S values of the bulk oil and their dibenzothiophene and alkyldibenzothiophene products were generally in the range +17 to +23 ‰,although some oils impacted by biodegradation showed slightly heavier δ34S values (＞+26 ‰). The Group II oils were not significantly impacted by secondary processes and their aromatic signature (e.g., aryl isoprenoids), δ34S data and whole oil δ13C values were closely correlated with regional Lower Cambrian source rocks and are atypical of Upper Ordovician source rocks. These results identify the Halahatang oils as a further representation of Lower Cambrian-derived oils of the Tabei Uplift. ? 2025 Elsevier Ltd

ISSN号：0146-6380

卷、期、页：卷204

发表日期：2025-06-01

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Organic Geochemistry

参与作者：Sun, Peng,Wang, Daowei,Qi, Yu,Xu, Chenlu,Greenwood, Paul F.

第一作者：蔡春芳

论文类型：期刊论文

论文概要：Sun, Peng,蔡春芳,Wang, Daowei,Qi, Yu,Xu, Chenlu,Greenwood, Paul F.，Unraveling the origin and charge of Halahatang oils, Tarim Basin，Organic Geochemistry，2025，卷204

论文题目：Unraveling the origin and charge of Halahatang oils, Tarim Basin