Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (3): 74-85.doi: 10.3969/j.issn.1673-8926.2016.03.011

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Petrophysical facies classification of tight sandstone reservoir and high-quality reservoir prediction: A case study from the second member of Xujiahe Formation in Anyue area, central Sichuan Basin

  Chai Yu1，2， Wang Guiwen2，3   

  1. Petroleum Industry Press，Beijing 100011，China；2.College of Geosciences，China University of Petroleum，Beijing 102249，China；3.State Key Laboratory of Petroleum Resource and Prospecting，China University of Petroleum，Beijing 102249，China
  • Online:2016-05-20 Published:2016-05-20

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Abstract: Affectedby geological processes including deposition, diagenesis and tectonism, reservoirs of Xujiahe Formation in central Sichuan Basin are relatively compact with poor physical properties and strong heterogeneity. In order to predict the distribution of high-quality reservoirs and their internal differences of reservoir properties, based on the concept of petrophysical facies, the data of core, thin sections, mercury injection and well logs were utilized to study four controlling factors including lithology and lithofacies, diagenetic facies, fracture facies and pore structure facies of the tight sandstone reservoir of the second member of Xujiahe Formation in Anyue area. Five types of lithology and lithofacies, five types of diagenetic facies, four types of fracture facies and four types of pore structure facies were identified. Well log characterization methods and well-log identification standards were established. Petrophysical facies classification and reservoir quantitative evaluation standard were also put forward. The results show that high-quality reservoirs are mainly located in the favorable superposition of lithology and lithofacies, diagenetic facies,fracture facies and pore structure facies, which is favorable petrophysical facies area. High-quality reservoirs of the second member of Xujiahe Formation are mainly situated in relatively porous and permeable zone in the lower and middle part of the clinoform and fracture-developed zone in the northern part of the study area. The study of petrophysical facies has significant effect on reservoir characterization, high-quality reservoir prediction and evaluation.

Key words: depositional systems, sequence stratigraphy, Wenchang Formation, Lufeng Depression, Pearl River Mouth Basin

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