Oil & Gas Geology ›› 2023, Vol. 44 ›› Issue (2): 468-479.doi: 10.11743/ogg20230217

• Methods and Technologies • Previous Articles    

Characterizing the heterogeneity of tight sandstone in outcropped Permian Shanxi Formation, Liujiang Basin

Hongqi YUAN1(), Xinyu DENG2, Huiyao DU3, Yinghua YU1(), Fengming XU4   

  1. 1.School of Earth Science,Northeast Petroleum University,Daqing,Helongjiang 163318,China
    2.No. 1 Oil Production Plant,Daqing Oilfield Company,PetroChina,Daqing,Helongjiang 163318,China
    3.NO. 1 Oil Production Plant,Dagang Oilfield Company,PetroChina,TianJin 300280,China
    4.Exploration Department,Daqing Oilfield Company,PetroChina,Daqing,Heilongjiang 163453,China
  • Received:2022-05-13 Revised:2023-01-05 Online:2023-04-01 Published:2023-03-17
  • Contact: Yinghua YU E-mail:yuan_flag@163.com;yyhyhq2008@ 163.com

Abstract:

Tight sandstone in outcropped Permian Shanxi Formation of the Liujiang Basin is highly heterogeneous as a result of various affecting factors, making quantitatively characterization of the feature quite a headache to parties of interest. A systematic and intensive sampling of the tight sandstone were performed and reservoir properties and relevant quantitative data were obtained through geological statistical analysis, testing and microscopic observation of thin sections. Hendrik Lorentz curves were drawn based on the analysis and the analytic hierarchy process (AHP) was also applied to determine the weights of influence factors such as permeability, porosity, surface porosity, matrix content and particle size, with a comprehensive and quantitative characterization method of the heterogeneity proposed. The study shows that the tight sandstones are highly heterogeneous with nearly identical porosity-permeability characteristics at both the vertical and lateral directions, indicating the invalidity of traditional assessment parameters such as breakthrough coefficient, variation coefficient and gradient in heterogeneity characterization due to the poor correlation between porosity and permeability. Meanwhile, the proposed method yields better results that fit well with the field observation. This method is also applicable to the description of heterogeneity of other types of unconventional reservoirs.

Key words: heterogeneity, quantitative characterization, Lorentz coefficient, field outcrop, tight sandstone, Shanxi Formation, Liujiang Basin

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