Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (4): 147-158.doi: 10.12108/yxyqc.20240413

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics of shale pore structure and its oil and gas geological significance of Lower Cambrian Niutitang Formation in Fenggang area，northern Guizhou

ZHU Biao1,2, ZOU Niuniu1,2, ZHANG Daquan3,4, DU Wei3,4, CHEN Yi3,4   

  1. 1. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China;
    2. Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, China;
    3. Key Laboratory of Unconventional Natural Gas Evaluation and Development in Complex Tectonic Areas, Ministry of Natural Resources, Guiyang 550004, China;
    4. Guizhou Engineering Research Institute of Oil & Gas Exploration and Development, Guiyang 550000, China
  • Received:2023-10-07 Revised:2023-12-16 Online:2024-07-01 Published:2024-07-04

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Abstract: Using whole rock X-ray diffraction（XRD），field emission scanning electron microscopy（FE-SEM） nuclear magnetic resonance（NMR），and low-temperature nitrogen adsorption experimental methods，multi-scale qualitative and quantitative characterization of the pore structure characteristics of shale of Cambrian Niutitang Formation of well Yongfeng 1 in Fenggang area of northern Guizhou was carried out，and its influencing factors and oil and gas geological significance were discussed. The results show that：（1）The shale minerals of Lower Cambrian Niutitang Formation in Fenggang area of northern Guizhou are mainly composed of quartz，feldspar and clay minerals，followed by carbonate minerals and pyrite. The pore types are mainly organic matter pores，intergranular pores，intragranular pores and micro-cracks，with organic matter pores and clay mineral intergranular pores being the most developed.（2）The average specific surface area of the shale of Niutitang Formation in the study area is 9.536 6 m2/g. The average total pore volume is 0.009 02 cm3/g，the average mesopore volume is 0.007 95 cm3/g，the macropore volume is 0.000 37-0.004 58 cm3/g，with an average value of 0.001 07 cm3/g，and the average pore size is 3.381-5.947 nm. The mesopores are the most developed. The pore volume of shale is mainly contributed by mesopores and macropores，and the specific surface area is mainly contributed by micropores and mesopores. The connectivity between micropores and mesopores and macropores is relatively poor， and the connectivity between mesopores and macropores is good. The pore shapes are mainly ink-bottle shaped， cylindrical shaped，and fracture shaped.（3）TOC，clay minerals and brittle minerals are the main factors controlling the pore structure of shale of Niutitang Formation in the study area. TOC and clay minerals have positive effects on specific surface area，total pore volume，mesopore volume and porosity，while brittle minerals have negative effects on specific surface area，porosity and mesopore volume.

Key words: pore structure, organic matter pore, clay mineral intergranular pore, mesopore, macropore, shale, Niutitang Formation, Lower Cambrian, well Yongfeng 1, Fenggang area in northern Guizhou

CLC Number: 

  • TE122.2+3
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