Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (1): 80-85.doi: 10.3969/j.issn.1673-8926.2014.01.012

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Characteristics of low permeability reservoir of Chang 2 reservoir in Xirengou area, Ordos Basin

GAO Chao1， SUN Binghua1， SUN Jianbo1， CAO Cheng1， WANG Yongfei2，YAN Xiong2   

  1. 1. Institute of Shaanxi Yanchang Petroleum （Group） Co. Ltd.， Xi’an 710075， China； 2. Dingbian Oil Production Plant， Yanchang Oilfield Corporation， Yulin 718600， Shaanxi， Chin
  • Online:2014-02-05 Published:2014-02-05

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Abstract:

Chang 2 reservoir in Xirengou area is typical low permeability reservoir. The sedimentary characteristics, lithology characteristics, reservoir properties, diagenesis types, pore texture and pore types of Chang 2 reservoir in Xirengou area were studied through analyzing the core, thin sections, scanning electronic microscope and physical properties. The result shows that Chang 2 reservoir developed in distributary channel has the characteristics of ultra-fined grain size of the deposits and low maturity, the pore types are mainly primary intergranular pores and secondary d issolved pores, and structural-lithologic trap is the main type of traps. A large number of arenopelitic and calcarenaceous interlayer that developed in the reservoir led to poor vertical differentiation of oil and water, and further separated reservoir, which makes the in-layer heterogeneity become stronger in single oil reservoir. The macro distribution of Chang 2 reservoir is controlled by local structure, reservoir lithology and physical properties.

Key words:  diagenetic facies, formation fluid, cements, Yanchang Formation, Ordos Basin

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