Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (1): 52-56.doi: 10.3969/j.issn.1673-8926.2012.01.010

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Characteristics of pore structure of Chang 2 oil reservoir set of Yanchang Formation in Dong-Han area

LI Yanjing1， GAO Chao2， DENG Jie1， KONG Lingfei3   

  1. 1. Department of Geology， Northwest University， Xi’an 710069， China； 2. Research Institute of Yanchang Petroleum（Group）Company Ltd.， Xi’an 710069， China； 3. Qinghe Oil Production Plant， Jianghan Oilfield Company， Sinopec， Shouguang 262714， China
  • Online:2012-02-20 Published:2012-02-20

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Abstract:

The property analysis, thin sections, scanning electronic microscope and mercury injection tests were applied to study the characteristics of low permeability reservoir and pore structure and discuss the effect of pore structure on physical properties of low permeability reservoir. The result shows that the pore types include residual
intergranular pores, dissolved pores，intercrystalline pore and micro-fracture，dominated by dissolved pores. Fine throat is the main throat type. Pore throat structure is mainly of middle pore-thin throat，followed by eyelet-thin throat and macropore-medium throat. The greater the pore throat radius is, the better the permeability of low permeability reservoirs is. Sorting coefficient and skewness show the characteristics of low permeability reservoirs such as various types of throat, different sizes and strong microscopic heterogeneity.

Key words: cave reservoir, numerical simulation, wave field analysis, reservoir inversion, frequencydiversity analysis

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