Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (2): 256-264.doi: 10.11743/ogg20120212

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Diagenetic facies types and logging identification methods for low-permeability tight sandstone reservoirs:a case study on the 8th member of Xiashihezi Formation in Sulige gasfield,Ordos Basin

Zhang Haitao1,2, Shi Zhuo1, Shi Yujiang1,2, Wang Liangliang3, He Lujun4   

  1. 1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi’an, Shaanxi 710018, China;
    2. National Engineering Laboratory for Exploration and Development of Low-permeability Oil & Gas Fields, Xi’an, Shaanxi 710018, China;
    3. The 4th Gas Production Plant, PetroChina Changqing Oilfield Company, Erdos, Inner Mongolian 017300, China;
    4. No.1 Gas Production Plant, PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China
  • Received:2011-03-31 Revised:2012-02-20 Online:2012-04-28 Published:2012-05-24

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Abstract:

Sulige gasfield in Ordos Basin is a typical tight gas reservoir.According to clastic constituents,diagenetic mineral assemblage,interstitial matter,and diagenesis types,et al,we identified 6 diagenetic faceis types in the 8th member of Xiashihezi Formation(He8)reservoir of Sulige gas field,including intergranular pore+strong solutional phase of volcanic material,intercrystal pore+solutional phase of volcanic material,intercrystal pore+solutional phase of debirs,intercrystal pore+cementation phase of quartz,hydromica cementation+weak solutional phase of debris and compaction+cementation tight phase.In addition,we analyzed the impacts of different digenesis on log responses.On the basis of these studies,a method for continuously and quantitatively identifying diagenetic facies was established by using gamma ray,interval transit time,density and deep lateral resistivity log data.Logging data of Well Z65 were processed with this method,and a comparison with the thin section data and mercury injection data show that the results are accurate.Based on single well diagenetic facies identification,we defined the diagenetic face distribution in He8 reservoirs of Sulige gasfield.The central part of the gas field is dominated by intergranular pore+strong solutional phase of volcanic material and intercrystal pore+solutional phase of volcanic material,which are the favorable diagenetic faces belts.

Key words: diagenetic facies type, logging identification criterion, tight sand reservoir, Sulige gasfield, Ordos Basin

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