Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (3): 142-153.doi: 10.12108/yxyqc.20220313

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Pore structure and classification evaluation of shale oil reservoirs of Permian Fengcheng Formation in Mahu Sag

LEI Haiyan1,2, GUO Pei3,4, MENG Ying1,2, QI Jing1,2, LIU Jin1,2, ZHANG Juan1,2, LIU Miao1,2, ZHENG Yu1,2   

  1. 1. Xinjiang Key Laboratory of Shale Oil Exploration and Development, Karamay 834000, Xinjiang, China;
    2. Research Institute of Experiment and Detection, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    3. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    4. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
  • Received:2021-10-18 Revised:2022-01-16 Online:2022-05-01 Published:2022-05-12

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Abstract: The Lower Permian Fengcheng Formation in Mahu Sag is the major source rock in the NW Junggar Basin，with great prospects for shale oil exploration. The pore structure of shale oil reservoirs of Fengcheng Formation in well Maye 1 in the study area was studied and classified by means of field emission electron scanning microscope and high-pressure mercury injection. The results show that： （1）The shale oil reservoir of Fengcheng Formation in Mahu Sag is dominated by thin-layer or massive dolomitic，silty，calcareous or siliceous mudstone， and a large amount of dolomite，calcite and siliceous bands，lumps or patches are often developed in the mudstone. （2）The pore types of shale oil reservoirs of Fengcheng Formation in the study area are mainly intergranular pores， matrix dissolved pores，intragranular dissolved pores，intercrystalline pores，intracrystalline dissolved pores and microfractures，among which matrix dissolved pores and intercrystalline pores are the most developed. The physical properties of the shale oil reservoirs are poor，the porosity values range from 0.4% to 17.7% and are mostly less than 3.0%，and the permeability value are mostly less than 0.03 mD，with the maximum of 2.90 mD，belonging to low porosity and extra-low permeability reservoirs.（3）The pore volume of samples in the study area is generally small，with an average of 0.25 cm3. The average values of average coefficient，sorting coefficient，skewness， peakedness and coefficient of variation is 13.95，2.44，0.97，1.25 and 0.17，respectively. The maximum mercury saturation is low，with an average of37.23%，and the efficiency of mercury-ejection is low，with an average of only 25.73%.（4）The shale oil reservoirs in the study area can be divided into three types： Ⅰ， Ⅱ and Ⅲ. Among them，type Ⅰ shale oil reservoirs with good physical properties and good internal pore connectivity have good prospects for oil and gas exploration and development.

Key words: shale oil reservoir, pore structures, pore types, Fengcheng Formation, Permian, Mahu Sag, Junggar Basin

CLC Number: 

  • TE122
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