Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (2): 26-30.doi: 10.3969/j.issn.1673-8926.2012.02.006

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Effect of clay minerals on low resistivity of Chang 61 reservoir in Wuqi area

ZHOU Kang1， LIU Jiaqing1， DUAN Guoying2， DING Lei1， ZHOU Lindan1   

  1. 1. Research Institute of Shaanxi Yanchang Petroleum （Group） Co. Ltd.， Xi’an 710075， China； 2. Oil-Gas Exploration Company of Shaanxi Yanchang Petroleum （Group） Co. Ltd.， Yan’an 717208， China
  • Online:2012-04-20 Published:2012-04-20

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Abstract:

In order to understand the effect of clayminerals on lowresistivity reservoirs, the slice, scanning electronic microscope, X-ray diffraction, logging interpretation and oil testing results were applied to study the effect of clay minerals on resistivity of Chang 61 reservoir in Wuqi area. The result shows that clay minerals play a dominate role on the forming of low resistivity reservoir. The role displays in the following three aspects: the role mainly is additional conductivity, and it is strongest in the illite/smectite mixed layer and is the key factor for resistivity decline; followed by the pore structure reformation which caused the bound water saturation increasing and resistivity decline, and it is most in illite; and then the absorption of water molecule which is mainly in chlorite. By considering the effects and mineral content, it was believed that the order of effect of clay minerals on resistivity is: illite > illite/semectite mixed layer > chlorite > kaolinite. This study result can be used to interpret the mechanism and predict the distribution of low resistivity reservoir.

Key words: seismic sedimentology, theoretical basis, seismic events, diachronism, planform of sedimentary bodies

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