Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (4): 148-156.doi: 10.12108/yxyqc.20260413

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary characteristics and hydrocarbon significance of Sinian Doushantuo Formation in the periphery of Hannan paleo-uplift, northwestern Sichuan Basin

LI Hongxi1(), LI Zhuzheng1, CAO Yonghong2,3, ZHAO Lei1, FU Yu1, XING Chaochao2,3, NING Meng2,3   

  1. 1 Geological Exploration and Development Research Institute, CNPC Chuanqing Drilling Engineering Company Ltd, Chengdu 610051, China
    2 Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
    3 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
  • Received:2025-12-24 Revised:2026-01-15 Online:2026-07-01 Published:2026-07-06

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Abstract:

In recent years, significant progress has been made in hydrocarbon exploration of Sinian Doushantuo Formation in the Yangtze craton. Combided field outcrop profiles observations and laboratory analysis, the stratigraphic distribution and sedimentary characteristics of Doushantuo Formation in the periphery of Hannan paleo-uplift in northwestern Sichuan Basin were systematically summarized, and the control mechanism of the tectonic on the development of source rocks in Doushantuo Formation were revealed. Research results show that: （1） Diffe-rent sedimentary systems were developed during the sedimentary period of Doushantuo Formation in the eastern and western sides of Hannan paleo-uplift. The western side developed a stable gentle slope sedimentary system characterized by mixed clastic and carbonate rocks,while the eastern side underwent a complete sedimentary succession of “slope filling-stable shelf-carbonate gentle slope”. （2） The sedimentary differentiation characteristics of both sides of Hannan paleo-uplift are controlled by the subduction-transition boundary of Panxi-Hannan island arc.The western side corresponds to the subduction boundary,with wide and gentle sedimentary terrain.The eastern side is located at the transition boundary, with steep slopes and continuous subsidence, providing favorable tectonic-paleogeographic conditions for deep-water anoxic environments and the development of high-quality source rocks. （3） The eastern side of Hannan paleo-uplift (Zhenba-Chengkou area) contains high-quality source rocks, with high TOC values (2.75%-4.76%) due to earlier-initiated tectonic activity, continuous subsidence, oxygen deficient reducing environment, and high paleoproductivity driven by hydrothermal activity. Due to constraints such as tectonic stability and poor preservation conditions, the western side develops limited-scale, medium-poor quality source rocks, with average TOC values of 1.20%-1.65%.

Key words: stratigraphic correlation, sedimentary characteristics, source rock, tectonic-sedimentary differentiation, Doushantuo Formation, Sinian, Hannan paleo-uplift, Sichuan Basin

CLC Number: 

  • TE122.2

Fig. 1

Structural location (a) and stratigraphic column of Sinian Doushantuo Formation in Mianzhu area (b), northwestern Sichuan Basin"

Fig. 2

Lithology correlation and the distribution of source rocks TOC of Sinian Doushantuo Formation on the east and west sides of Hannan paleo-uplift"

Fig. 3

Field outcrop photos of Doushantuo Formation in the Zuojiawan section of Ningqiang in the western margin of Hannan paleo-uplift, northwestern Sichuan Basin"

Fig. 4

Field outcrop photos of Doushantuo Formation in the Qingping section of Mianzhu in the western margin of Hannan paleo-uplift, northwestern Sichuan Basin"

Fig. 5

Sedimentary facies map of the sedimentary period of Doushantuo Formation in the periphery of Hannan paleo-uplift, northwestern Sichuan Basin"

Fig. 6

Schematic diagram of the plate movement in Hannan paleo-uplift and adjacent regions， northwestern Sichuan Basin"

Fig. 7

Distribution patterns of source rocks of Doushantuo Formation in the periphery of Hannan paleo-uplift, northwestern Sichuan Basin"

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