Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 36-48.doi: 10.12108/yxyqc.20210205

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Micro pore throat structure and its influence on seepage of Chang 81 tight reservoir in Nanliang-Huachi area,Ordos Basin

ZHANG Xiaohui1,2, ZHANG Juan3,4, YUAN Jingsu5, CUI Xiaoli1,2, MAO Zhenhua1,2   

  1. 1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    2. National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi'an 710018, China;
    3. College of Geosciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    4. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an 710065, China;
    5. No. 8 OilProduction Plant, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2020-03-15 Revised:2020-06-12 Online:2021-04-01 Published:2021-03-31

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Abstract: Chang 81 reservoir in Nanliang-Huachi area of Ordos Basin is characterized by various pore throat structures,complex seepage characteristics,unclear understanding of reservoir accumulation and oil-water relationship,which restricts the process of oil exploration breakthrough and scale development. The micro pore structure of Chang 81 reservoir in Nanliang-Huachi area was systematically studied by means of casting thin section, constant velocity mercury injection,nuclear magnetic resonance and oil-water relative permeability test,and the difference of micro pore throat structure of samples with different physical properties in the study area and its influence on oil-water seepage characteristics were compared and analyzed. The results show that:(1) The better the reservoir physical properties of the reservoir,the stronger the micro heterogeneity,the greater the movable fluid saturation, the displacement efficiency in the anhydrous period increases first, then decreases, and the higher the final water displacement efficiency.(2) When the permeability is higher than 1.000 mD,the permeability contribution mainly depends on a few connected throats with radius greater than 6.00 μm,while the permeability is lower than 1.000 mD, the permeability contribution is mainly determined by the small throats in the peak range of throats radius. (3) The pore fluid in the radius of connected throat less than 0.10 μm is immovable fluid. The better the reservoir physical properties are,the larger the pore volume controlled by the throat with the radius greater than 0.50 μm is,the higher the saturation of movable fluid is.(4) The characteristics of oil-water relative permeability in the study area can be divided into three types,among which the physical property of type I is poorest and the oil displacement efficiency is the lowest. The throat radius of type Ⅱ is 0.50-1.00 μm,and the permeability range of the two-phase is wide,the oil displacement efficiency and final oil displacement efficiency are highest in anhydrous period. The throat radius of type Ⅲ is greater than 1.50 μm,the water cut rises rapidly,the oil displacement efficiency is lowest in anhydrous period,but its final oil displacement efficiency is slightly lower than that of type Ⅱ. The distribution and connection characteristics of throat radius are one of the important factors of complex oilwater relationship in this area,which determine the permeability of reservoir and the saturation of movable fluid, affect the rule of oil-water two-phase flow,and have an important influence on oil filling,reservoir accumulation and development. The research results have certain guiding significance for analyzing oil-water relationship of lithologic reservoir and predicting favorable reservoir distribution.

Key words: tight sandstone, micro pore structure, constant velocity mercury injection, nuclear magnetic resonance, seepage characteristics, Ordos Basin

CLC Number: 

  • TE122
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