Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (5): 83-88.doi: 10.3969/j.issn.1673-8926.2012.05.015

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Reservoir characteristics and controlling factors of dolomitic rocks of Fengcheng Formation in Wufeng area, northwestern margin of Juggar Basin

YIN Jianguo 1，2， DINGChao3， GU Qing3， WANGZhongjun3， WANGGuiwen3， SHI Ji’an1   

  1. 1. Key Laboratory of Petroleum Resources Research， Institute of Geology and Geophysics， Chinese Academy of Sciences， Lanzhou 730000， China； 2. Graduate School of Chinese Academy of Sciences， Beijing 100049， China； 3. Fengcheng Field Operation District， PetroChina Xinjiang Oilfield Company， Karamay 834000， China
  • Online:2012-10-20 Published:2012-10-20

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Abstract:

Based on the investigation of cores, rock slices and scanning electronic microscope, this paper investigated the reservoir properties and controlling factors of the Permian Fengcheng Formation in Wufeng area, northwestern margin of Juggar Basin. The result shows that siltstone, mudstone and tuff developed in the study area were dolomitized in various extents. Dolomite crystal developed mainly fine crystal and powder crystal. The distribution patterns of dolomite crystal in tuffaceous or mud matrix show three different types: lump, satellite and along bedding or fracture. Intergranular pores, intercrystalline pores, dissolved pores and fractures developed mainly in Fengcheng Formation. Both of dissolved pores and fractures are the main reservoir space. Deposition, dolomitization and tectonism affect the reservoir properties together. Depositional setting determines the distribution of dolomitic rocks, dolomitization enhances rock brittle, and large amounts of fractures developed under tectonismas reservoir spaces and percolation channel, which makes dissolved pores developed around.

Key words: lithofacies, paleogeography, sand bodies distribution, Suining Formation, western Sichuan Depression

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