Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (3): 637-649.doi: 10.13278/j.cnki.jjuese.20170330

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Influencing Factors and Quantitative Assessment of Pore Structure in Low Permeability Reservoir: A Case Study of 2nd Member of Permian Upper Urho Formation in Jinlong 2 Area, Junggar Basin

Shan Xiang1, Guo Huajun1, Guo Xuguang2, Zou Zhiwen1, Li Yazhe1, Wang Libao1   

  1. 1. Hangzhou Research Institute of Geology, PetroChina, Hangzhou 310023, China;
    2. Institute of Exploration and Development of Xinjiang Oilfield Company, PetroChina, Keramay 834000, Xinjiang, China
  • Received:2017-12-18 Online:2019-05-26 Published:2019-06-03
  • Supported by:
    Supported by Major National Science and Technology Projects for the 13th Five-Year Plan (2017ZX05001-002)

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Abstract: The pore microstructure characteristics and their influencing factors of the 2nd member of Permian Upper Urho Formation (P3w2) in Jinlong 2 area were analyzed by using thin sections, SEM, porosity, permeability, and mercury injection curve data. The results show that:1)P3w2 is characterized by low porosity and low permeability. Based on mercury injection curves, the pore microstructure can be divided into three categories. 2)Diagenesis controls P3w2 pore microstructure. Quantitative assessments show that the average apparent compaction rate, average apparent cementation rate, average apparent dissolution rate, and average apparent micropore rate are 53.54%, 47.53%, 13.84%,and 60.67% respectively. P3w2 is characterized by moderate compaction, moderate to strong cementation, weak dissolution and well developed micropores. Thus compaction, cementation, micropores are the main factors controlling the P3w2 pore microstructure. 3)The comprehensive diagenetic coefficient was chosen to quantitatively assess the multiple diagenetic strength, and revealed good statistical correlation with displacement pressure, sorting coefficient,and RQI. The comprehensive diagenetic coefficient value of the reservoir typesⅠ, Ⅱ and Ⅲ are more than 8%, 2%-8%, less than 2%,respectively. It can be concluded that the comprehensive diagenetic coefficient can be taken as the quantitative characterization parameter for evaluating reservoir pore microstructure.

Key words: pore structure, diagenesis, influence factor, low permeability reservoir, Upper Urho Formation, Junggar basin

CLC Number: 

  • TE122
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