Reconstruction of sedimentary paleoenvironment of Permian Lucaogou Formation and its implications for the organic matter enrichment in south-eastern Junggar Basin, China
Yong TANG1, Xiatian WANG1, Tao WANG1, Chenlu HEI2(), Shuang LIANG2, Hu CHENG2
. Research Institute of Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China . School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
The Permian Lucaogou Formation represents one of the most important hydrocarbon source rock intervals in the Junggar Basin, although the sedimentary paleoenvironment and organic matter enrichment mechanism of the Lucaogou Formation remain controversial. We studied the temporal evolution of the sedimentary paleoenvironment in the Lucaogou Formation by analyzing the elemental composition and total organic carbon content of 27 hydrocarbon source rock samples from the J305 well in the Jimsar Sag. Using these data, we found that the Lucaogou Formation overall was deposited in a semisaline to saline, reducing lake basin under an arid climate. We identified five organic matter-enriched intervals, which can be correlated with the parameters that indicate a wetter climate and a more anoxic lake environment. To compare sedimentary environments spatially, we compiled environmental indicators from 10 cores and outcrops in three sags around the Bogda Mountains. The compilation shows that the organic matter-enriched Jimsar Sag experienced a more arid climate and a more saline and anoxic lake environment during the deposition of the Lucaogou Formation, which was possibly controlled by the paleogeographic position. We conclude that the spatially arid climate and anoxic environment induced organic matter burial in the Jimsar Sag, while temporal events of a more humid climate and more anoxic environment triggered the enrichment of organic matter in some intervals of the Lucaogou Formation.
Online First Date: 03 July 2024Issue Date: 29 September 2024
Cite this article:
Yong TANG,Xiatian WANG,Tao WANG, et al. Reconstruction of sedimentary paleoenvironment of Permian Lucaogou Formation and its implications for the organic matter enrichment in south-eastern Junggar Basin, China[J]. Front. Earth Sci.,
2024, 18(3): 526-537.
Fig.1 Geological setting of the south-eastern Junggar Basin and the lithological profile of well J305. (a) Schematic diagram of secondary uplifts in the Junggar Basin; (b) location of well J305 in the Jimsar Sag and other wells/outcrops in adjacent sags compiled in this study; (c) lithological profile of well J305 (modified from Tao et al., 2022).
Fig.2 Comparison of the major (a) and trace (b) element contents of the Lucaogou Formation with those of the North American shale (NASC).
Fig.3 Normalized rare earth element concentrations of the Lucaogou Formation normalized to chondrites.
Fig.4 Plot of TOC contents and indicators of paleoclimate, water depth, redox conditions, and productivity versus depth in the Lucaogou Formation in the J305 well.
Fig.5 Relationships between Sr/Cu ratios and the TOC content (a), V/Cr ratios and the TOC content (b), Fe/Mn ratios and the TOC content (c), and Ba/Al ratios and the TOC content (d).
Fig.6 Comparison of paleoclimatic and paleoenvironmental indicators among the Chaiwopu, Fukang, and Jimsar Sags in the south-eastern Junggar Basin. Abbreviations along the x-axis indicate multiple cores and outcrop sections, as shown in Fig. 1 (data of well ZY3 are from Chen et al. (2017); QJG is the Qijiagou section, and the data are from Liu et al. (2022a); JJZG is the Jingjingzigou section, and the data are from Cheng et al. (2022) and Lin et al. (2019); SGH is the Sigonghe section, and the data are from Shi et al. (2018); BYH is the Baiyanghe section, and the data are from Zhao (2016); HSH is the Huangshanhe section, and the data are from Li et al. (2016); DLK is the Dalongkou section, and the data are from Cheng et al. (2022) and Lin et al. (2019); XLK is the Xiaolongkou section, and the data are from Liu et al. (2022a); well J174 is located in the Jimsar Sag, and the data are from Tao et al. (2022)).
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