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Palynofacies analysis for interpreting paleoenvironment and hydrocarbon potential of Triassic–Jurassic strata in the Sichuan Basin, China
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences.
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences.
Swedish Museum of Natural History, Department of Paleobiology. Department of Geology, Lund University, Sweden.ORCID iD: 0000-0003-2987-5559
2021 (English)In: Palaeoworld, ISSN 1871-174X, E-ISSN 1875-5887, Vol. 30, no 1, p. 126-137Article in journal (Refereed) Published
Abstract [en]

The Sichuan Basin is one of the largest petroliferous basins in China. The continental fluvial‒lacustrine sediments of the Upper Triassic Xujiahe Formation and the Lower Jurassic Zhenzhuchong Formation yield diverse fossil organisms and host one of the most important gas reservoirs in thebasin. However, paleontological implication for the paleoenvironment and hydrocarbon source is less documented. Here, we report, for the first time for this basin, results from palynofacies analyses combined with thermal alteration data in the Early Mesozoic deposit of the Qilixia section, northeastern Sichuan Basin. The results show that, organic matters in sediments are dominated by phytoclasts, with less abundant palynomorphs and a few amorphous organic matters (AOMs). Four palynofacies assemblages were identified, reflecting depositional settings in a general proximal and oxicfluvial‒deltaic environment, with two distal-proximal sedimentary cycles. The prominent dominance of opaque phytoclasts within the lower Zhenzhuchong Formation may be related to frequent wildfires across the Triassic-Jurassic transition. Palynofacies data (especially the relative abundanceof opaque phytoclasts) may reflect 405 kyr eccentricity cyclicity pattern. The palynofacies and thermal alteration index (TAI), combined with geochemical data indicate the presence of type III kerogen in mature to post-mature phases, suggesting gas potential of the Xujiahe and Zhenzhuchong formations in the northeastern Sichuan Basin. This study provides significant implications for better understanding the paleoenvironment variationsduring the Triassic-Jurassic transition and the future gas exploration in this area.

Place, publisher, year, edition, pages
Nanjing: Elsevier, 2021. Vol. 30, no 1, p. 126-137
Keywords [en]
Palynofacies, Source rock potential, Paleoenvironment, Wildfire, Xujiahe Formation, Zhenzhuchong Formation
National Category
Other Earth and Related Environmental Sciences
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4451DOI: 10.1016/j.palwor.2020.04.007OAI: oai:DiVA.org:nrm-4451DiVA, id: diva2:1618086
Funder
Swedish Research Council, 2019-4061
Note

Also funded by the National Science Foundation of China (NSFC41702004, 41790454, 41572014, 41688103), Strategic PriorityResearch Program (B) of the Chinese Academy of Sciences(XDB18000000, 26000000), the State Key Laboratory ofPalaeobiology and Stratigraphy (20172103, 20191103)

Available from: 2021-12-01 Created: 2021-12-08 Last updated: 2023-01-09Bibliographically approved

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Publisher's full texthttps://doi.org/10.1016/j.palwor.2020.04.007

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