Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 32-44.doi: 10.12108/yxyqc.20240104

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Tectonic-depositional environment and prototype basin evolution of Middle-Late Permian in Ordos Basin and adjacent areas

ZHAI Yonghe1, HE Dengfa2, KAI Baize3   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
    3. Bureau of Geophysical Prospecting Inc., CNPC, Zhuozhou 072751, Hebei, China
  • Received:2022-11-16 Revised:2023-03-27 Online:2024-01-01 Published:2024-01-02

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Abstract: According to drilling, logging, field outcrops and geochemical data, combined with peripheral tectonic environment, tectonic subsidence characteristics and sedimentary facies distribution characteristics, the tectonic depositional environment in different periods of Middle-Late Permian in Ordos Basin was restored, and the nature and evolution of the basin were discussed. The results show that:(1) The northern and southern margins of Ordos Basin experienced subduction of ocean basins in the Middle to Late Permian, which was characterized by strong compressive tectonic environment. During the sedimentary period of Upper Permian Shiqianfeng Formation, the northern margin of Ordos Basin entered the stage of continental collision when the Paleo-Asian Ocean closed, and the tectonic subsidence in the basin was slow.(2) The Ordos Basin was a large intra-craton depression basin in Middle-Late Permian, and the base level of Middle Permian Shihezi Formation showed a downward trend. The main part of the basin followed the paleogeographic pattern of Shanxi Formation, which was high in the north and south and low in the middle, and the topography of the southern North China was relatively lower. The surrounding uplift areas were rapidly uplifted and gradually expanded, providing provenance for the depression basin. Alluvial fans, alluvial plains, deltas and shallow lacustrine facies developed in the basin. To the south, the remaining tidal flat-lagoon was developed, showing a north-south distribution. In the Late Permian, with the base level tended to be stable, the lacustrine scope expanded and the tidal flat-lagoon environment narrowed southward.(3) The sedimentary environment in the study area plays a controlling role in hydrocarbon accumulation. The terrestrial delta depositional system developed in Middle Permian is conducive to favorable reservoirs and cap rocks, and form favorable reservoir-reservoir-cap assemblages with lower coal measures in Middle Permian. Due to the paleoclimate of oxidation and drought in Upper Permian, shallow water bodies and thin mudstone, the hydrocarbon generation potential is limited and it cannot form large-scale gas reservoir.

Key words: prototype basin restoration, close of Paleo-Asian Ocean, intra-craton depression basin, basin evolution, tectonic-depositional environment, delta deposit, Shihezi Formation, Shiqianfeng Formation, MiddleLate Permian, Ordos Basin

CLC Number: 

  • TE122
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