Organic Geochemical Characteristics of the Upper Cretaceous Qingshankou Formation Oil Shales in the Fuyu Oilfield, Songliao Basin, China: Implications for Oil-Generation Potential and Depositional Environment

Wentong He, Youhong Sun, Wei Guo, Xuanlong Shan, Siyuan Su, Shaopeng Zheng, Sunhua Deng, Shijie Kang and Xu Zhang
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Wentong He: College of Construction Engineering, Jilin University, Changchun 130021, China
Youhong Sun: College of Construction Engineering, Jilin University, Changchun 130021, China
Wei Guo: College of Construction Engineering, Jilin University, Changchun 130021, China
Xuanlong Shan: Key Laboratory of Oil Shale and Coexistent Energy Minerals of Jilin Province, Changchun 130061, China
Siyuan Su: College of Earth Sciences, Jilin University, Changchun 130000, China
Shaopeng Zheng: College of Construction Engineering, Jilin University, Changchun 130021, China
Sunhua Deng: College of Construction Engineering, Jilin University, Changchun 130021, China
Shijie Kang: College of Construction Engineering, Jilin University, Changchun 130021, China
Xu Zhang: College of Construction Engineering, Jilin University, Changchun 130021, China

Energies, 2019, vol. 12, issue 24, 1-18

Abstract: The Cretaceous Era has always been a focus of geologic and palaeoenvironmental studies. Previous researchers believed that the impact of the global carbon cycle represents significant short-term global biogeochemical fluctuations, leading to the formation of a large number of organic rich sediments in the marine environment. During the Turonian, a large number of organic-rich oil shales were deposited in the lakes of the Songliao Basin in the Qingshankou Formation. How the depositional environment affected the formation of oil shales in continental lakes and the characteristics of these oil shales remain controversial. In this paper, through sampling of Qingshankou Formation strata, various testing methods are used to provide a variety of new data to study the characteristics of oil shales and palaeoenvironment evolution history in the Songliao Basin. The research of the sediments in the Qingshankou Formation in the Fuyu oilfield, Songliao Basin, via result analysis revealed that the oil shales possess an excellent oil-generation potential with moderate-high total organic carbon (TOC) levels (0.58–9.43%), high hydrogen index (HI) values (265–959 mg hydrocarbons (HC)/g TOC), high extractable organic matter (EOM) levels (2.50–6.96 mg/g TOC) and high hydrocarbon fractions (48–89%). The sources of the organic matter were mainly zooplankton, red algae and higher plants (including marine organisms). The aqueous palaeoenvironment of the Qingshankou Formation was a saline water environment with a high sulfate concentration, which promoted an increase in nutrients and stratification of the water density in the lake basin. Oxygen consumption in the bottom water layer promoted the accumulation and burial of high-abundance organic matter, thus forming the high-quality oil shales in the Qingshankou Formation. The global carbon cycle, warm-humid palaeoclimate, dynamic local biogeochemical cycling and relative passive tectonism were the most likely reasons for the TOC increase and negative δ 13 C org deviation.

Keywords: Qingshankou Formation; oil shale; Songliao Basin; oil-generation potential; depositional environment (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: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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