Synergistic Evolution of Palaeoenvironment—Bionts and Hydrocarbon Generation of Permian Saline Lacustrine Source Rocks in Jimusar Sag, Junggar Basin

Zaibo Xie, Huifei Tao (), Yongqiang Qu, Tao Wu, Dongzheng Ma, Tianhai Wang, Zhen Qin, Long Su and Zhongping Li
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Zaibo Xie: Oil and Gas Research Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
Huifei Tao: Oil and Gas Research Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
Yongqiang Qu: Northwest Branch of PetroChina Research Institute of Petroleum Exploration and Development, Lanzhou 730000, China
Tao Wu: Research Institute of Exploration and Development, Petrochina Xinjiang Oilfield Company, Karamay 834000, China
Dongzheng Ma: Oil and Gas Research Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
Tianhai Wang: Oil and Gas Research Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
Zhen Qin: Oil and Gas Research Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
Long Su: Oil and Gas Research Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
Zhongping Li: Oil and Gas Research Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China

Energies, 2023, vol. 16, issue 9, 1-21

Abstract: This study focused on Middle Permian Lucaogou Formation saline lake source rocks, utilizing a combination of biomarkers and hydrocarbon generation thermal simulation to analyze their biological compositions, depositional environments, and hydrocarbon generation potential. The Pr/Ph ratio, Ph/ n C 18 ratio, and Pr/ n C 17 ratio indicate that the Lucaogou Formation was in a reducing environment during the deposition period, and the lower part of the Lucaogou Formation (P 2 l 1 ) is more anoxic than the upper part of the Lucaogou Formation (P 2 l 2 ). The maturity index 20S (%) and ββ (%) reflect that the maturity of organic matter in the P 2 l 1 is slightly higher than that in the P 2 l 2 . The G/H index and the ETR index indicate that the stratification of the water column is better during the sedimentary period of Lucaogou Formation and the salinity of the P 2 l 1 is higher than that of the P 2 l 2 . The biomarker parameters of n C 21− / n C 22+ , CPI, S/H, and C 22 T/C 21 T reflect that the organic matter of the source rocks have a higher abundance of bacteria and algae than higher plants, and the contents of bacteria are more than that of algae. The (7- + 8-MMAs)/C max and (C 28 + C 29 − St)/St parameters indicate that cyanobacteria accounted for a certain proportion of bacteria, and the algae are mainly green algae. The co-evolution of the sedimentary environment and the biological composition reflects the control of the sedimentary paleoenvironment on biological composition. According to the relative content of cyanobacteria, green algae, and Rhodophyta, the source rocks of the upper and lower Lucaogou Formation correspond to the low-salinity type (LS-type) and the high-salinity type (HS-type), respectively. Compared with LS-type source rocks, HS-type source rocks have greater generation potential of oil and weaker gas generation potential. This study is valuable for the accurate assessment of source rocks and holds significant practical implications for the exploration of oil and gas resources.

Keywords: biomarker; synergistic evolution; hydrocarbon generation; Lucaogou Formation; Jimusar (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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