Aromatic biomarkers and oil source of the Ordovician crude oil in the Halahatang Sag, Tarim Basin

被引：1

作者：

Chang, Xiangchun ^{[1
]}

Wang, Tieguan ^{[2
]}

Tao, Xiaowan ^{[3
]}

Cheng, Bin ^{[2
]}

机构：

[1] Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, Shandong University of Science and Technology, Qingdao, 266590, Shandong

[2] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing

[3] Research Institute of Petroleum Exploration and Development, PetroChina, Beijing

来源：

Oil and Gas Geology | 2015年 / 36卷 / 02期

关键词：

Aromatic; Biomarker; Crude oil; Depositional environment; Halahatang Sag; Oil source; Oil-source correlation; Thermal maturity;

D O I：

10.11743/ogg20150201

中图分类号：

学科分类号：

摘要：

Halahatang Sag has been one of the focuses for petroleum exploration in recent years. In order to confirm its oil source, depositional environment, thermal maturity and possible source rocks, systematic aromatic biomarkers analyses were performed on 26 oil samples from the Halahatang Sag and the Ordovician in Tahe oilfield as well as 4 potential source rock samples from the unmodified foreland region of the Tarim Basin. The results show that the Halahatang oil samples are characterized by high contents of naphthalenes and phenanthrenes, low content of biphenyl, low abundance of 1, 2, 5-TMN, high abundance of 1, 3, 6-TMN, high ratios of 4-MDBT/DBT and(2+3)-MDBT/DBT, and light carbon isotope of aromatics, which are similar to those of oil samples from the Tahe oilfield, indicating typical marine origin with contribution of lower algae and bacteria in predominance. High relative content of dibenzothiophene and low values of DBT/P and Pr/Phinfer a strong reducing depositional environment and carbonate lithology for the source rock. The equivalent vitrinite reflectances, i.e. Rc1 and Rc2, reveal a moderate to high maturity. Comparison of methyl triaromatic sterane isomeride shows that the Halahatang and Tahe oils correlate well with the Middle-Upper Ordovician source rocks, indicating a genetic affinity. ©, 2015, Editorial Office of Oil & Gas Geology. All right reserved.

引用

页码：175 / 182

页数：7

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