Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (3): 71-76.doi: 10.3969/j.issn.1673-8926.2013.03.012

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Study on micro-pore structure characteristics of Chang 8 reservoir in Yingwang Oilfield, Ordos Basin

ZHANG Yiguo1， SUN Wei1， REN Dazhong1， WANG Yue2， QI Hengxuan1， QU Xuefeng 3，4   

  1. （1. State Key Laboratory of Continental Dynamics， Northwest University， Xi’an 710069， China； 2. Research Institute of Engineering Technology， Huabei Branch Company， Sinopec， Zhengzhou 450006， China； 3. National Engineering Laboratory for Exploration and Development of Low-permeability Oil/Gas Fields， Xi’an 710021， China； 4. Research Institute of Exploration and Development, PetroChina Changqing Oilfeild Company， Xi’an 710021，  China
  • Online:2013-06-01 Published:2013-06-01

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Abstract:

Chang 8 reservoir in Yingwang Oilfield is characterized by strong heterogeneity, complex micro-pore structure and low yield. Based on scanning electronic microscope, casting thin slice, high pressure mercury penetration and oil/water displacement experiment, this paper studied the petrology characteristics, physical properties, micro-pore structure and its effect on flowing ability and oil displacement efficiency of Chang 8 reservoir in Yingwang Oilfield. The result shows that the pore structure can be divided into three types, including residual intergranular pore-dissolved pore, dissolved pore-residual intergranular pore and micropore-dissolved pore. We should focus on the dissolved pore-residual intergranular pore which is the best reservoir in the study area. The type and relative content of fillings, the core porosity and pore throat radius are the main factors influencing the flowing ability for low permeability reservoirs.

Key words: glutenite, pore structure, flowing pore volume, heterogeneity, the second member of Nantun Formation, Huhenuoren Oilfield

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