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Primary geologic origins analysis on low resistivity zone in Dongying Depression

Cai Qiulong(Geological Scientific Research Institute,Shengli Oilfield Company,SINOPEC,Dongying 257015,China).  
In view of the low resistivity zones of high formation water salinity,the influences of formation water on reservoir apparent resisitivity were quantitatively evaluated and the primary geology origins were analyzed through petrophysical experimental analysis and anatomy of representative blocks' geologic features.The results show that the low resistivity zones of high formation water salinity can be come into being when the formation water salinity is greater than 50gramme per litre,that the sedimentary water environment and structure fracture are primary geology origins of low resistivity zones of high formation water salinity,which mostly distribute in the reservoir of the fourth section of Shahejie Formation,base of the middle part of the third section in Shahejie Formation and the vicinity of large structure fractures in Dongying Depression.
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