Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 89-102.doi: 10.12108/yxyqc.20220409

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Quantitative characterization of pore structure of shale reservoirs of Permian Lucaogou Formation in Jimsar Sag

ZHANG Jigang1, DU Meng2,3,4, CHEN Chao1, QIN Ming1, JIA Ninghong3,4, LYU Weifeng3,4, DING Zhenhua1, XIANG Yong2   

  1. 1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. College of Mechanical and Transportation Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    4. State Key Laboratory of Enhanced Oil Recovery, PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2021-12-10 Revised:2022-03-15 Online:2022-07-01 Published:2022-07-07

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Abstract: The Permian Lucaogou Formation in Jimsar Sag is an important shale oil and gas accumulation area. Based on the analyses of cast thin sections,mercury injection and nuclear magnetic resonance,combined with medical CT,micro-CT scanning technology,quantitative evaluation of minerals by scanning electron microscope(QEMSCAN)and advanced mathematical algorithms of Avizo visualization software,a three-dimensional digital core of shale reservoirs of Lucaogou Formation in Jimsar Sag was constructed,and the pore network model parameters were extracted,and the full-scale pore size distribution curves were obtained. The comprehensively quantitative characterization of microscopic pore structure from multiple dimensions was carried out. The results show that:(1)The average porosity of the shale reservoirs of Lucaogou Formation in the study area is 7.6%, and the average permeability is 0.37 mD,which belongs to low porosity and ultra-low permeability tight shale reservoir. The main reservoir space is secondary dissolved pores,including residual intergranular pores,biological cavity pores and diagenetic microfractures.(2)The pore throat scale ranges from nanometers to micrometers. The throats within 0.12-1.75 μm have the highest contribution rate,and the submicron-micron pore throats have a greater contribution to seepage. The pores are mainly distributed in isolated and banded shape. The pore radius is mostly 4.5-12.5 μm,the throat radius is mostly 1.3-5.1 μm,and the throat length is 5-15 μm. The pore throat coordination number is mainly 1-2. The pore structure has the characteristics of strong heterogeneity and poor connectivity,and the contribution of pore connectivity to seepage is greater than that of pore scale.(3)On the nano scale,the matrix minerals are mainly quartz and albite,the main nano micropores are organic matter pores in mineral particles(crystals)and cement micropores, and the pore radius is 0.015-5.000 μm.

Key words: shale oil, heterogeneity, cross scale, digital core, microscopic pore structure characterization, Lucaogou Formation, Permian, Jimsar Sag

CLC Number: 

  • TE122
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