Geochemical Features of Lacustrine Shales in the Upper Cretaceous Qingshankou Formation of Changling Sag, Songliao Basin, Northeast China

Zhongcheng Li, Zhidong Bao, Zhaosheng Wei, Lei Li and Hailong Wang ()
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Zhongcheng Li: Research Institute of Exploration and Development, PetroChina Jilin Oilfield Company, Songyuan 138000, China
Zhidong Bao: College of Geosciences, China University of Petroleum-Beijng, Beijing 102249, China
Zhaosheng Wei: Research Institute of Exploration and Development, PetroChina Jilin Oilfield Company, Songyuan 138000, China
Lei Li: College of Geosciences, China University of Petroleum-Beijng, Beijing 102249, China
Hailong Wang: Research Institute of Exploration and Development, PetroChina Jilin Oilfield Company, Songyuan 138000, China

Energies, 2022, vol. 15, issue 19, 1-15

Abstract: The organic-rich shale of the Upper Cretaceous Qingshankou Formation is an important hydrocarbon source rock in Northeast China. In this study, taking the lacustrine shale in the Qingshankou Formation as an example, geochemical analysis, including total organic carbon (TOC), Rock-Eval pyrolysis, maceral compositions, X-ray diffraction (XRD), and biomarker analyses, were carried out on twenty-four shale samples to evaluate the geochemistry and environmental features of this shales. The Qingshankou lacustrine shales contains mainly Type I/II 1 organic matter and is oil prone, with a good to excellent source rock. Vitrinite reflectance and Rock-Eval pyrolysis parameters show that the Qingshankou lacustrine shales is mainly in the mature stage and within the oil window. Biomarker composition of the shales provide evidence that the Qingshankou lacustrine shales was formed in a reductive sedimentary environment with relatively high salinity water. The organic matter came from a mixture of plankton, bacterial and land plants.

Keywords: geochemical features; paleoenvironment; shale oil; Qingshankou Formation; Changling sag; Songliao Basin (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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