Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (4): 24-28.doi: 10.3969/j.issn.1673-8926.2012.04.005

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Reservoir characteristics of Ma 5 1+2 sub-member of the Ordovician Majiagou Formation in Gaoqiao area, Ordos Basin

LUO Xiangjian1, TIAN Jingchun1, ZHANG Jinquan1, CAO Tongsheng2, DU Yuguo3, ZHAO Ronghua1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China; 2. Research Institute of Exploration and Development, Huabei Oilfield Company, Sinopec, Zhengzhou 450000, China; 3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi’an 710021, China
  • Online:2012-08-20 Published:2012-08-20

Abstract:

Based on cores, cast thin sections, scanning electron microscope, mercury injection data, this paper studied the reservoir characteristics of Ma 5 1+2 sub-member of the Ordovician Majiagou Formation in Gaoqiao area. The result shows that the types of reservoir rock are mainly of dissolved dolomite, mud powder crystal dolomite, followed by grain (sand clastic) dolomite and brecciated dolomite. The main reservoir pore types are mainly dissolved pores, intercrystal pores, intercrystal dissolved pores, followed by gypsummould pores and fractures. The properties of reservoir rocks are poor, the average porosity is 3.26%, and the average permeability is 1.2 mD.With strong heterogeneity, it is totally a low permeability and lowporosity reservoir. The study of reservoir characteristics can provide geologic basis for the further
exploration and development in this area.

Key words: hydrocarbon accumulation condition, superimposed rift-subsidence basin, exploration region, Lishui- Jiaojiang Sag

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