Abstract
Fine-grained carbonate rocks, which extensively occur in the Eocene strata in the Shulu sag, Bohai Bay Basin, North China, represent an unconventional, fine-grained carbonate reservoir. However, previous studies have ignored the complexity of the lithofacies components and their formation mechanisms. Fine-grained carbonate rocks are typical reservoirs in which hydrocarbons form and gather. A better understanding of the nature of these rocks is extremely important for evaluating the quality of unconventional, fine-grained carbonate reservoirs. Various lithofacies components were discriminated in this study with a combination of petrographic observations and carbon isotope analyses. These finegrained carbonate rocks comprise terrigenous, biogenic and diagenetic materials. Terrigenous input and biologically induced precipitation are the main sources of the materials in the lake. Five lithofacies were identified based on the observations of sedimentary features (core and thin section) and mineralogical data: (1) varve-like laminated calcilutite, (2) graded laminated calcilutite, (3) interlaminated calcisiltitecalcilutite, (4) massive calcilutite, and (5) massive calcisiltite-calcarenite. Their origins were recorded by various lithofacies components, which are controlled by the interactions of physical, chemical and biological processes. This study indicated that the lithology of the bedrocks was the key factor controlling carbonate accumulation. The tectonics and climate can influence the weathering and types of lithofacies. Primary productivity controlled the precipitation of the endogenic calcite. These factors jointly determined the abundant fine-grained carbonate rocks that have accumulated in the Shulu sag.
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Acknowledgements
The finances for this study were provided by the National Major Research Program for Science and Technology of China (No. 2017ZX05009-002) and the National Natural Science Fund (No. 41772090). We are grateful to the Huabei (North China) Oil Company for permitting data access. The final publication is available at Springer via https://doi.org/10.1007/s12583-016-0927-x.
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Kong, X., Jiang, Z., Han, C. et al. Genesis and implications of the composition and sedimentary structure of fine-grained carbonate rocks in the Shulu sag. J. Earth Sci. 28, 1047–1063 (2017). https://doi.org/10.1007/s12583-016-0927-x
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DOI: https://doi.org/10.1007/s12583-016-0927-x