Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (1): 102-106.doi: 10.3969/j.issn.1673-8926.2013.01.019

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Recognition of compacted sandstone gas reservoirs of Tai 2 member in Daniudi Gas Field

WU Juanjuan1， LI Zhongdong 1，2， CHEN Wei1， LIU Dong1   

  1. 1. College of Energy Resources， Chengdu University of Technology， Chengdu 610059， China； 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology， Chengdu 610059， China
  • Online:2013-02-20 Published:2013-02-20

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Abstract:

The second member of Taiyuan Formation in Daniudi Gas Field belongs to typical compacted gas-bearing sandstone reservoir with low porosity and low permeability. Due to its low porosity, low permeability and strong heterogeneity, it is difficult to identify and evaluate the gas reservoir. According to the fact that lithology controls the physical properties, and physical properties control gas-bearing characteristics in the tight sandstone reservoir, the lithology, physical properties and electrical properties of Tai 2 member were analyzed. The result shows that Tai 2 member belongs to compacted gas-bearing sandstone reservoirs with low porosity and low permeability. Based on logging data, the interpretation parameter model was established. The crossplots of open flow capacity with acoustic travel time, deep lateral resistivity, shale content, porosity and gas saturation were respectively used to identify the effective gas-bearing layers, and its recognition standard was established. The log interpretation resulted from test layers of 23 development wells were used to test the standard of the effective gas reservoir with an interpretation coincidence rate of 86.96%. It proves the validity of the proposed method.

Key words: fault sealing capacity, qualitative evaluation, quantitative evaluation

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