Lithologic Reservoirs ›› 2007, Vol. 19 ›› Issue (3): 28-31，53.doi: 10.3969/j.issn.1673-8926.2007.03.004

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The classification and evaluation criterion of low permeability reservoir : An example from Ordos Basin

ZHAO Jingzhou,WU Shaobo,WU Fuli   

  1. School of Petroleum Resources , Xi’an Shiyou University , Xi’an 710065 , China
  • Online:2007-09-15 Published:2007-09-15

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Abstract:

Based on the mercury penetration analysis of more than 300 samples and analysis result s of more than 260 casts and more than 100 image pores , and referred to the classification criterion about clastic reservoir , especially low permeability reservoir , the low permeability sandstone reservoirs in Ordos Basin were divided into four types and four sub-types. The four types include low permeability reservoir ( I) , extra-low permeability reservoir ( II) , super-low permeability reservoir ( III) and tight reservoir ( IV) . Among them extra-low permeability reservoir and super-low permeability reservoir are the main reservoir types of Triassic Yanchang Formation in Ordos Basin. According to t he characteristics of t he pore structure and petrophysics and the classification criterion of the reservoir thickness , they are divided into two
sub-types respectively.

Key words: non-Newtonian power law fluid , horizontal well , heavy oil , productivity analysis , steady seep-age flow

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