Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (1): 132-144.doi: 10.12108/yxyqc.20230112

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Microscopic pore structure characteristics of the upper member of Oligocene Xiaganchaigou Formation in Yingxi area, Qaidam Basin

XIA Qingsong1, LU Jiang2, YANG Peng1, ZHANG Kun1, YANG Chaoyi1, NIE Junjie1, ZHU Yunfang1, LI Lifang1   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang 524000, Guangdong, China
  • Received:2022-08-29 Revised:2022-09-09 Online:2023-01-01 Published:2023-01-06

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Abstract: The upper member of Oligocene Xiaganchaigou Formation (E32) in Yingxi area of Qaidam Basin is a self-generation and self-storage type oil and gas reservoir. By using a series of experimental means such as X-ray diffraction analysis of whole rock mineral content，thin section identification，scanning electron microscope observation，carbon dioxide adsorption，nitrogen adsorption/desorption，high pressure mercury injection，nuclear magnetic resonance and spontaneous absorption，the reservoir characteristics of E32 in Yingxi area were systematically analyzed and the microscopic pore structure characteristics were finely characterized. The results show that: (1) The reservoirs of E32 in Yingxi area are dominated by fine-grained sedimentary rocks. Its mineral composition is mainly carbonate such as dolomite and ankerite，containing terrigenous clasts such as feldspar and quartz，and clay minerals such as illite-montmorillonite mixed-layer and illite. (2) The reservoir rocks in the study area are relatively dense as a whole. The porosity is 1.0%-14.5%，with an average of 4.0%，while the permeability is 0.011-6.146 mD， with an average of 0.125 mD，which is characterized by low porosity and ultra-low permeability. (3) The pore types of the reservoir rocks in the study area are mainly intercrystalline pores，dissolved pores，caves and fractures， and the pores are parallel slit-shaped. (4) The average pore volume of micropores in the study area is 0.005 6 mL/g， accounting for 34.70% of the total pore volume. The average pore volume of mesopores is 0.006 6 mL/g，accounting for 40.84% of the total pore volume. The pore volume of macropores is 0.0039 mL/g，relatively small，accounting for 24.46% of the total pore volume. Therefore，mesopores contribute the most to rock reservoirs，followed by micropore.

Key words: intercrystalline pore, low porosity and extra-low permeability, parallel slit-shaped pore, adsorption/ desorption experiments, nuclear magnetic resonance, upper member of Xiaganchaigou Formation, Oligocene, Yingxi area, Qaidam Basin

CLC Number: 

  • TE122.2
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