The Denglouku Formation in the paleo-central uplift of the Songliao Basin is a large thick clastic deposit that has important oil and gas exploration potential. However, the natural gas in the Denglouku Formation has not yet formed to the necessary scale. The paleo-sedimentary environment plays an important role in controlling the development of source rocks and the physical properties, development, and distribution of reservoirs. Therefore, studying the paleo-sedimentary environment has important guiding significance for the formation and accumulation of oil and gas. In addition, studying the paleo-sedimentary environment of the Denglouku Formation can effectively reconstruct the terrestrial climate change in the Cretaceous and provide basic terrestrial geological data for studying the global Cretaceous paleoclimate, paleoenvironmental changes, and greenhouse climate. This paper uses clastic rock geochemistry, especially V/Cr, V/(V + Ni), Sr/Cu, SiO2/Al2O3, and Sr/Ba ratios and DF1, DF2, as well as other characteristic values and discriminations, to confirm that the depositional environment gradually changed from an oxygen-poor or reducing environment in the center to an oxygen-rich environment on the north and south sides; the climate in the north was drier and hotter than that in the south, and the humid climate in the south led to strong chemical weathering. There was a tendency to gradually evolve from a marine to transitional to freshwater environment from north to south. The source area was an active continental margin and a continental arc.
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We gratefully acknowledge anonymous reviewers for their detailed and constructive comments, which helped to greatly improve the manuscript. In addition, we sincerely thank American Journal Experts (AJE) for performing English language editing.
This research was financially supported by the Major Science and Technology Projects of China National Petroleum Corporation (grant no. 2016E-0203), the 69th batch of China Postdoctoral Funds (grant no. 2021M690591), the Basic Scientific Research Operating Expenses for Universities in Heilongjiang Province (grant no. 2021YDQ-02), the Science and Technology Research and Development Project of Qinhuangdao City (grant no. 202005A049), and the Talent Introduction and Scientific Research Start-up Funded Project of Northeast Petroleum University (grant no. 2019KQ87).
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Jiang, C., Xie, F., Pei, M. et al. A study on the sedimentary environment of the Denglouku Formation in the paleo-central uplift, Songliao Basin, China: constraints from clastic rock geochemistry. Arab J Geosci 14, 2161 (2021). https://doi.org/10.1007/s12517-021-08489-y
- Songliao Basin
- Paleo-central uplift
- Denglouku Formation
- Sedimentary environment