Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (6): 1529-1539.doi: 10.13278/j.cnki.jjuese.20180238

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Quantitative Identification of Diagenetic Facies of Tight Sandstone Reservoirs and Its Control on Oil-Bearing Property: A Case Study of Chang 7,Ganquan-Fuxian

Li Hongjin1, Zhang Daoyong2, Ge Yunjin1, Wang Yichao3, Xu Gang4   

  1. 1. Shaanxi Yanchang Petroleum(Group) Co, Ltd. Xi'an 710075, China;
    2. Srategic Research Center for Oil and Gas Resources of the Ministry of Land and Resources, Beijing 100034, China;
    3. The First Oil Production Plant of PetroChina Dagang Oilfield, Tianjing 300280, China;
    4. The Northwest Sichuan Bureau of Geology and Mineral Resources, Mianyang 621000, Sichuan, China
  • Received:2018-09-11 Online:2019-11-26 Published:2019-11-30
  • Supported by:
    Supported by Shaanxi Science and Technology Co-Ordinated Innovation Project (2012KTZB03-03)

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Abstract: The lithology, physical property, and diagenetic facies of the Chang 7 tight sandstone reservoirs in Ganquan-Fuxian area of Ordos basin were studied by using core analysis, thin section identification, SEM, and logging data. The lithology of the Chang 7 tight sandstone reservoir is mainly feldspar sandstone, with porosity between 3% and 10%, and permeability between 0.05 and 0.60 mD. Five types of digenetic facies were identified based on the type and strength of diagenesis combined with the features of diagenetic minerals, the characteristics of pore development, and its impact on reservoir property. They are medium compacted chlorite cementation native intergranular pore facies, medium compacted corrosion of unstable components solved pore facies, strongly compacted weakly dissolved microporous facies, strongly compacted illite cemented tight facies, and strongly compacted calcareous cemented tight facies. Natural gamma ray and acoustic logging are sensitive to diagenetic facies. A logging identification model was established by using the logging data of the study area, and the "dominant facies" method was used to predict the distribution of diagenetic facies. The result shows that the diagenesis is relatively tight, and plays a controlling role in oil accumulation.

Key words: diagenetic facies, tight sandstone reservoir, Ordos basin, quantitative evaluation

CLC Number: 

  • P618.13
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