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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Economic Geology
Volume 12 - 2024 | doi: 10.3389/feart.2024.1491529
This article is part of the Research Topic Formation Mechanism and Heterogeneity Evaluation of Lacustrine Shale Reservoirs View all articles

The Neoproterozoic Ediacaran Kaijiang-Xuanhan paleo-uplift in the Sichuan basin, western China

Provisionally accepted
Ran Guo Ran Guo 1,2Zeqi Li Zeqi Li 1*Jianxue Wu Jianxue Wu 2*Shugen Liu Shugen Liu 1*Wei Sun Wei Sun 1*Peng Wang Peng Wang 2*Bin Deng Bin Deng 1Liwei You Liwei You 1*Zhiyi Liu Zhiyi Liu 2*
  • 1 State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan Province, China
  • 2 CNPC Chuanqing Drilling Engineering Company, Chengdu, Sichuan Province, China

The final, formatted version of the article will be published soon.

    The structural characteristics and formation evolution of the Sinian Kaijiang-Xuanhan paleo-uplift play a foundational role in the formation and evolution of the Sichuan Basin. To comprehensively understand the structural characteristics and formation evolution of the Sinian Kaijiang-Xuanhan paleo-uplift, this paper, based on geological, logging, seismic, and drilling, this analysis further confirms the existence of the Sinian Kaijiang-Xuanhan paleo-uplift and provides a detailed study of its characteristics. The entire Ediacaran tectonic sedimentary framework of the Sichuan Basin was controlled by this northeast-trending paleouplifted area. The Dengying Formation in the Kaijiang-Xuanhan region and the Mianyang-Anxian-Changning region both exhibit a thinning trend, but the genetic mechanisms are different. The thinning in the former is the result of sedimentary control during the early stages of paleouplift, with the lower parts of the first and second stages being absent; in the latter region, this is due to subsequent erosion. During the deposition periods of the Doushantuo and Dengying formations, the Sichuan Basin was predominantly in a weak compressional state, forming the Kaijiang-Xuanhan paleo-uplift, with the main structural orientation being northeastward. By the late Dengying Formation and early Cambrian, the region experienced a weak extensional state, resulting in the development of the Mianyang-Changning rift, with the main structural orientation being north-northwestward. The Kaijiang-Xuanhan paleo-uplift underwent four stages: the incubation period (before the deposition of the Doushantuo Formation), the peak development period (during the deposition of the Doushantuo Formation), the decline period (during the deposition of the Dengying Formation), and the extinction period (during the Lower Cambrian deposition). The further confirmation and in-depth study of the Sinian Kaijiang-Xuanhan paleo-uplift enhances the understanding of the Neoproterozoic craton of the Sichuan Basin and enriches the theory of the formation and evolution of the Sichuan Basin.

    Keywords: Neoproterozoic paleo-uplift, Kaijiang-Xuanhan, Petroleum accumulation, Sichuan Basin, China

    Received: 05 Sep 2024; Accepted: 10 Dec 2024.

    Copyright: © 2024 Guo, Li, Wu, Liu, Sun, Wang, Deng, You and Liu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence:
    Zeqi Li, State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059, Sichuan Province, China
    Jianxue Wu, CNPC Chuanqing Drilling Engineering Company, Chengdu, Sichuan Province, China
    Shugen Liu, State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059, Sichuan Province, China
    Wei Sun, State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059, Sichuan Province, China
    Peng Wang, CNPC Chuanqing Drilling Engineering Company, Chengdu, Sichuan Province, China
    Liwei You, State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059, Sichuan Province, China
    Zhiyi Liu, CNPC Chuanqing Drilling Engineering Company, Chengdu, Sichuan Province, China

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