Reservoir characteristics and controlling factors of dolomitic rocks of Fengcheng Formation in Wufeng area, northwestern margin of Juggar Basin
Online published: 2012-10-20
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.
LIU Anran , CHEN Hongde , XU Shenglin , ZHAO Junshou . Reservoir characteristics and controlling factors of dolomitic rocks of Fengcheng Formation in Wufeng area, northwestern margin of Juggar Basin[J]. Lithologic Reservoirs, 2012 , 24(5) : 83 -88 . DOI: 10.3969/j.issn.1673-8926.2012.05.015
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