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Comprehensive thermal maturity assessment in shales: a case study on the upper cretaceous Qingshankou formation (Songliao Basin, NE China)

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Abstract

The Songliao Basin is the largest Early Cretaceous lacustrine rift basin of northeast China and hosts tremendous conventional and unconventional petroleum resources. However, the distribution of shale oil is not well constrained, as production from source rock reservoirs requires certain thermal maturity cut-offs (vitrinite reflectance of > 0.8%Rr). In this study, the thermal maturity of the Qiangshankou Formation along the Southern Uplift and in the Central Depression of the Songliao Basin was evaluated by combining traditional and advanced petrographic and geochemical maturity proxies with clay mineralogical investigations. The Qingshankou Formation is one of the major source rocks of the region, but previous studies encountered difficulties in obtaining reliable maturity data, mainly due to strongly shifted Tmax values. Equally, Tmax determined during this study showed apparent shifting likely caused either by retained solid bitumen or by variations in kerogen type. In contrast, the measured vitrinite reflectance shows a reliable depth trend, meeting the shale oil cut-off maturity of 0.8%Ro at a drilling depth of ~ 2300 m, which is only reached in the Central Depression of the basin. The vitrinite reflectance trend is supported by changes in clay mineralogy, such as the progressing ordering of I/S mixed layers (“Reichweite”), increasing illitization, decreasing detrital kaolinite and correspondingly increasing authigenic chlorite contents. Maturity-related biomarker proxies are only partly valid; while the methylphenanthrene index (MPI-1) and the trimethylnaphthalene ratio (TNR-1) show reliable maturity trends even over short depth intervals, other established proxies (e.g. based on alkylbiphenyls) proved insensitive to changes from immature to peak oil mature and are, therefore, not recommended for further use in studies on Qingshankou Fm. shales. In summary, the combination of various maturity parameters improves the understanding of shale oil distribution in the central Songliao Basin, providing valuable insights for studies on similar unconventional targets in the region.

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Acknowledgements

We thank Mr. Günter Nobis and Mrs. Doris Gross  for their support during the laboratory work. We are also grateful to the chief editor, Prof. Wolf-Christian Dullo and two reviewers, Prof. Ralf Littke and Prof. Bo Liu for their suggestions and comments, which significantly improved the quality of the manuscript. We acknowledge support from the China Geological Survey (Grant DD2019139-YQ19JJ04, Grant DD20189606), the Program of the National Natural Science Foundation of China (Grant 41872103), as well as the Evaluation of In-Situ Development Resources and Dynamic Geological Parameters of Oil Shale in Jilin Province project (Grant 20180201077SF) and Jilin University & Jilin Province co-construction project (Grant SXGJSF2017-5). Zhang Penglin was supported by a 12-monthscholarship granted by the National Construction of High-quality University Projects of Graduates from China Scholarship Council (CSC) (No. 201906170223).

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Authors and Affiliations

  1. College of Geoscience, Jilin University, Changchun, 130061, China

    Penglin Zhang, Qingtao Meng, Zhaojun Liu, Fuhong Gao, Fei Hu, Shuaihua Zhang & Baiqiang Tang

  2. Department for Applied Geosciences and Geophysics, Montanuniversitaet Leoben, Peter-Tunner-Str. 5, 8700, Leoben, Austria

    David Misch, Achim Bechtel & Reinhard F. Sachsenhofer

  3. Key Laboratory of Oil Shale and Symbiotic Energy Minerals, Changchun, 130061, Jilin Province, China

    Qingtao Meng, Zhaojun Liu & Fei Hu

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  1. Penglin Zhang
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Zhang, P., Misch, D., Meng, Q. et al. Comprehensive thermal maturity assessment in shales: a case study on the upper cretaceous Qingshankou formation (Songliao Basin, NE China). Int J Earth Sci (Geol Rundsch) 110, 943–962 (2021). https://doi.org/10.1007/s00531-021-02000-4

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