The Identification And Evaluation Of Excellent Source Rockin Tanan Sag And Nanbeier Sag

Low resistivity reservoir is generalized concept, it is referred to oil layers that oil layers and the pure water layers resistivity ratio less than2in the same water system, even they are equal to water layers resistivity. Because the low resistivity reservoir resistivity low or close to the neighboring water resistivity, it is difficult for reservoir evaluation and development.so the research of Putaohua low resistivity reservoir is very neccssary.Through analysis logging response characteristics and genesis mechanism of Putaohua low resistivity reservoir in Sanzhao, the article determine that the high immobile water saturation and thin interbed low resistivity reservoir are the two main cause.Through analysis petrophysical data, it determine that the fine lithology. heavy mud, complex pore structure is the main causes of rock physics,and it causes of the high immobile water saturation and causes of low resistivity oil layers. Through analysis macroscopic geological factor of Putaohua low resistivity reservoir in Sanzhao,it think that characteristics of weak water power, sediment fine lithology and heavy mud in Delta and edge is the main geologic genesis;secondly, followed by oil and gas reservoir of low amplitude lithologic-structural is also one of the important causes. In the light of characteristics in Sanzhao, utilization of natural gamma-ray relative value and intersection graph technology of apparent formation water resistivity,it establish the identification methods of low resistivity reservoir. Conclusion of Old.well re-examination is applied in production, according to comprehensive analysis influence factors of the low resistivity reservoir in each oil field of Sanzhao,it forecast the blocks of low resistivity reservoir.In Sanzhao, Fang508-3,Fang34-xie42.Fang14-1of oilfield Songfangtun.Wei1-16-24of oilfield Weixing,Seng74-F2of oilfield Shengping,Xu22-4of oilfield Xujiaweizi are the low resistivity zones.