Geochemical oil and source correlation between crude oil of well Fusha 8 and source rocks of Permian Pusige Formation in southern margin, piedmont of southwestern Tarim Basin

WANG Xiang; GE Zhushi; ZHANG Huifang; SUN Di; WANG Zhanghu; XIE Xiaomin; MENG Qiang; CHEN Guo; XIAO Qilin

doi:10.11781/sysydz2025020372

Volume 47 Issue 2

Mar. 2025

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WANG Xiang, GE Zhushi, ZHANG Huifang, SUN Di, WANG Zhanghu, XIE Xiaomin, MENG Qiang, CHEN Guo, XIAO Qilin. Geochemical oil and source correlation between crude oil of well Fusha 8 and source rocks of Permian Pusige Formation in southern margin, piedmont of southwestern Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(2): 372-383. doi: 10.11781/sysydz2025020372

Citation:

WANG Xiang, GE Zhushi, ZHANG Huifang, SUN Di, WANG Zhanghu, XIE Xiaomin, MENG Qiang, CHEN Guo, XIAO Qilin. Geochemical oil and source correlation between crude oil of well Fusha 8 and source rocks of Permian Pusige Formation in southern margin, piedmont of southwestern Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(2): 372-383. doi: 10.11781/sysydz2025020372

Citation:

WANG Xiang, GE Zhushi, ZHANG Huifang, SUN Di, WANG Zhanghu, XIE Xiaomin, MENG Qiang, CHEN Guo, XIAO Qilin. Geochemical oil and source correlation between crude oil of well Fusha 8 and source rocks of Permian Pusige Formation in southern margin, piedmont of southwestern Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(2): 372-383. doi: 10.11781/sysydz2025020372

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Geochemical oil and source correlation between crude oil of well Fusha 8 and source rocks of Permian Pusige Formation in southern margin, piedmont of southwestern Tarim Basin

doi: 10.11781/sysydz2025020372

WANG Xiang^{1, 2, 3, 4
,},
GE Zhushi⁵,
ZHANG Huifang^{1, 2, 3, 4, 6},
SUN Di¹,
WANG Zhanghu⁵,
XIE Xiaomin⁵,
MENG Qiang⁵,
CHEN Guo⁵,
XIAO Qilin^{5
,
,}

1.
PetroChina Tarim Oilfield Company, CNPC, Korla, Xinjiang 841000, China
2.
Key Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang, Hebei 065007, China
3.
Xinjiang Key Laboratory of Ultra-deep Oil and Gas, Korla, Xinjiang 841000, China
4.
Key Laboratory of Carbonate, CNPC, Korla, Xinjiang 841000, China
5.
College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China
6.
State Energy Key Laboratory of Carbonate Oil and Gas, Korla, Xinjiang 841000, China

Received Date: 2023-11-20
Rev Recd Date: 2025-02-06
Publish Date: 2025-03-28

Abstract

Abstract

To further expand the oil and gas exploration in the southern margin of the piedmont of the southwestern Tarim Basin, this study focuses on the newly discovered oil from well Fusha 8 and source rocks from wells Fusha 2 and Yang 1 in the Permian Pusige Formation of the Fusha-Keliyang structural belt. Organic geochemical oil and source correlation research was conducted. Through pyrolysis, vitrinite reflectance testing, gas chromatography (GC), GC-Mass Spectrometry (MS), and n-alkane monomer hydrocarbon isotope analysis, the geochemical characteristics of different layers of source rocks in the Permian Pusige Formation were characterized from aspects such as basic geochemical properties, molecular biomarkers, and monomer hydrocarbon carbon isotope compositions. The study revealed variations in hydrocarbon generation potential across different layers of source rocks from the Pusige Formation. Also, oil sources in well Fusha 8 were preliminarily explored. Results showed that the upper part of the upper section and the middle section of the Pusige Formation had low organic matter abundance, containing type Ⅲ organic matter, and were unlikely to serve as effective source rocks. Also, these source rocks may be contaminated by migrated hydrocarbons from the deeply buried reservoirs. The lower part of the upper section and lower section of the Pusige Formation had relatively higher organic matter abundance, featuring type Ⅱ₁ to Ⅲ organic matter in the low mature to mature stages. The lower part of the upper section of the Pusige Formation was deposited in a mildly oxidizing shallow lake environment, and the organic matter inputs were mixtures of terrestrial higher plants and aquatic organisms. Its lower section was deposited in a more reducing deep to semi-deep lake environment, with a higher content of aquatic organisms as inputs. The crude oil from the Lower Jurassic of well Fusha 8 had higher Pr/Ph, C₂₄Te/C₂₆TT, and sterane/hopane ratios and lower C₁₉-C₂₃TT/C₃₀H ratios. It was rich in C₂₉ regular steranes, fluorene, and dibenzofuran, with n-alkane monomer carbon isotope values ranging from -32.0‰ to -29.0‰. These characteristics are consistent with the biomarker and monomer hydrocarbon carbon isotope compositions of the lower part of the upper section of source rocks in the Pusige Formation, confirming a strong geochemical oil and source correlation between them.
- biomarkers,
- stable carbon isotopes,
- Pusige Formation,
- Permian,
- Kekeya Oilfield,
- Tarim Basin

All authors declare no relevant conflict of interests.
The study was designed by WANG Xiang, XIAO Qilin, and ZHANG Huifang. The experimental operation was completed by GE Zhushi, WANG Zhanghu, XIE Xiaomin, MENG Qiang, and CHEN Guo. The manuscript was drafted and revised by WANG Xiang, XIAO Qilin, and GE Zhushi. All authors have read the final version of the paper and consented to its submission.

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Geochemical oil and source correlation between crude oil of well Fusha 8 and source rocks of Permian Pusige Formation in southern margin, piedmont of southwestern Tarim Basin

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Geochemical oil and source correlation between crude oil of well Fusha 8 and source rocks of Permian Pusige Formation in southern margin, piedmont of southwestern Tarim Basin

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