Journal of Jilin University(Earth Science Edition) ›› 2025, Vol. 55 ›› Issue (4): 1051-1060.doi: 10.13278/j.cnki.jjuese.20220274

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Micropore Characteristics of Tuff Lava of Yingcheng Formation in  Yingshan Fault Depression in  Songliao Basin#br#

Ji Jinjiao1, Bian Weihua1, 2, Tang Huafeng1, 2, Li Yuanzhe1, Wang Pujun1   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China
    2. Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Jilin University, Changchun 130061, China
  • Received:2024-10-08 Online:2025-07-26 Published:2025-08-05
  • Supported by:
    the National Natural Science Foundation of China (41790453)

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Abstract: The tuff lava of the Yingcheng Formation in the Yingshan fault depression of the Songliao basin is characterized by ultra-low porosity and low permeability. In order to characterize the nanometer to micron multiscale reservoir space and evaluate qualitatively and quantitatively, the factors influencing tuff lava reservoir development in the Yingcheng Formation are discussed. Based on core observation and thin section identification, combined with FE-SEM, LTNA, HPMI, CPMI, and NMR, the micropore characteristics of the Yingcheng Formation tuff lava were characterized qualitatively and quantitatively at multiple scales. The results show that: The tuff lava of the Yingcheng Formation is mainly composed of vitric debris and rhyolitic debris. The reservoir space types are mainly devitrification pore, feldspar dissolved pore, and illite intercrystalline pore. A great number of secondary pores and fissures are formed during the devitrification process, and provide about 66.8% of pore volume, which is vital to improving the reservoir physical properties. 

Key words: tuff lava, microstructure, pore type, reservoir, Yingcheng Formation, Yingshan fault depression, Songliao basin

CLC Number: 

  • P588.1
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