Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (5): 82-90.doi: 10.3969/j.issn.1673-8926.2016.05.010

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Lithofacies paleogeographic characteristics in the Late Triassic in the North China area

Lin Yuxiang， Zhu Chuanzhen， Zhao Chengjin， Wu Yuchen   

  1. （College of Geological Science and Engineering， Shandong University of Science and Technology，Qingdao 266590， Shandong， China）
  • Online:2016-09-29 Published:2016-09-29

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Abstract:

There are few studies on the Late Triassic lithofacies paleogeography in North China, which leads to little understanding of sedimentary pattern and evolution law. Under the guidance of sequence stratigraphy theory, combined with the formation development characteristics, the Upper Triassic in North China area was divided into two isochronous stratigraphic units, Carnian and Norian?Rhaetian, and the lithofacies paleogeographic maps were compiled respectively. During the Late Triassic, the topography of the North China area is lower in the west than that in the east, the stratum is thicker in the west than that in the east, and its sedimentary type is dominated by nonmarine deposits. The main sedimentary area in the North China area is mainly located in the Ordos Basin and the southern North China. The Ordos Basin is an open inland depression based on fluvial?lacustrine clastic sedi?ments, whose lithofacies is coarse in the north and fine in the south, and stratigraphic thickness is thin in the north and thick in the south, so the sedimentary center is near the south, and oil and gas resources of the Upper Triassic are mainly distributed in the central and western areas of the basin. The main sedimentary types in the southern North China are fan delta facies, fluvial facies and shore?shallow lacustrine facies, and the sedimentary center and sub?sidence center continuously migrated to the northwest. Sedimentary formation is mainly developed in Jiyuan depression and scattered in other areas. Due to the poor reservoir properties, the oil and gas resources of upper Triassic are scarce. The study on lithofacies paleogeographic characteristics of Late Triassic in the North China area reveals the laws of basin evolution, sedimentary system, source rock, reservoir distribution and their mutual relationships in that period. It is considered that the Late Triassic in the North China area mainly exists three types of source?reservoir?cap rock assemblages, including self?source and self?reservoir，up?source and down?reservoir, and down?source and up?reservoir. It is pointed out that Yanding delta, Huanxian delta, Tianshuipu delta and Huanxian?Ganquan area of Ordos Basin and Jiyuan area are favorable for hydrocarbon exploration.

Key words:  carbonate rocks, sedimentary facies model, gentle slope platform model, Middle Permian Qixia Formation, northwestern Sichuan Basin

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