Reconstruction and implications of the thermal history of Sinian-Cambrian formations in a superimposed basin: A case study in the central uplift of the Sichuan Basin, SW China

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  • 1. Petrochina Research Institute of Petroleum Exploration and Production, Beijing 100083, China;
    2. Oil & Gas Survey, China Geological Survey, Beijing 100083, China;
    3. PetroChina Hangzhou Research Institute of Geology (HIPG), Hangzhou 310023, China;
    4. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Received date: 2023-01-08

  Revised date: 2023-05-10

  Online published: 2023-06-27

Abstract

Joint inversion based on multiple layers and multiple paleo-thermometers was conducted to reconstruct the thermal histories of the Sinian Dengying Formation and Cambrian Canglangpu Formation in the Central Sichuan paleouplift depending upon the present-day thermal state and thermal regime defined, so as to figure out the method of thermal history reconstruction for ancient formations in superimposed basins. The results indicate that, during two heating periods, the highest paleotemperature of the Dengying Formation was close to 240 °C and that of the Canglangpu Formation was about 200 °C in the Gaoshiti-Moxi area, where the Emei mantle plume did not display a determent impact. With the paleotemperature evolution, the thermal evolution process of the Lower Cambrian source rocks in the Deyang-Anyue rift area, and the burial dissolution peaks and hydrocarbon charging process of the Dengying Formation in the Gaoshiti-Moxi area can be correlated, while the thermal evolution of the Lower Cambrian source rocks in the east flank of the rift is found “relatively late”. The deep burial and heating process during the foreland basin phase determines the high-over maturation of organic matters and crude oil cracking into gas. The uplifting event in the Late Yanshan-Himalayan period might actuate the gas accumulation in the subsequent two phases. Finally, the implications of paleo-thermometers to tectonic-thermal processes and events are discussed, and the existing problems in thermal history reconstruction for ancient formations in superimposed basins and corresponding solutions are proposed.

Cite this article

SHI Yizuo, WANG Zecheng, XU Qiuchen, HUANG Shipeng, JIANG Hua, LIU Jingjiang, FU Xiaodong, LI Wenzheng, JIANG Qingchun, ZHAI Xiufen, HU Shengbiao . Reconstruction and implications of the thermal history of Sinian-Cambrian formations in a superimposed basin: A case study in the central uplift of the Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 0 : 20230817 -20230817 . DOI: 10.11698/PED.20230011

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