Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (4): 66-72.doi: 10.3969/j.issn.1673-8926.2014.04.010

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Characteristics of tight oil reservoirs of the Permian Fengcheng Formation in Wu-Xia area, Junggar Basin

LIU Yinghui 1，2，ZHU Xiaomin1，ZHU Mao1，L IAO Zongbao3，WANG Xiaojun4，WANG Junhuai4
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  1. 1. College of Geosciences， China University of Petroleum， Beijing 102249， China； 2. Shanghai Branch， CNOOC， Shanghai 200030， China； 3. Research Center， CNOOC， Beijing 100027， China； 4. Research Institute of Exploration and Development， PetroChina Xinjiang Oilfield Company， Karamay 834000， Xinjiang， China
  • Online:2014-08-15 Published:2014-08-15

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Abstract:

Tight oil reservoirs have become popular targets in petroleum exploration both at home and abroad in recent years. This paper studied the rock types, reservoir space, physical properties and main influencing factors for “sweet spots” of tight oil reservoirs of Permian Fengcheng Formation in Wu-Xia area by using petrography, SEM, cathodoluminescence and core analysis. The result shows that the reservoir of Fengcheng Formation consists of dolomitic rock, tuff, siltstone, mudstone and salt beds, with the first present predominantly in the reservoirs. The main reservoir spaces are fractures, dissolved pores, intracrystalline pores and intergranular pores. Fracture and dissolved porosity in the reservoirs are around 53% and 35% respectively. The porosity is 1%～10%, with an average porosity of 3.86%. The average permeability is 0.17 mD, and the samples that the permeability is less than 2 mD account for more than 85%. The reservoir belongs to low porosity and low permeability reservoir. The “sweet spots” of the tight oil reservoir is mainly influenced by dolomitization, fracturing and dissolution.

Key words:  horizontal wells, acidizing, productivity formula, conformal mapping, area equivalence, complex potential

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