Study on logging response mechanism shows that,reservoir with high mud and irreducible water saturation,thin layer and interlayer are main causes for forming low-resistivity oil layer,while being tight and containing calcareous and residue oil are main factors of forming high-resistivity water layer.

In view of the situation that the spontaneous potential (SP) abnormality in some wells of Shengli Oilfield at high resistivity zones, such as Dongying group and membersⅠ,Ⅱ and Ⅲ of Shahejie group resulted in disunity of rock feature with wireline logging data and errors in interpretation, combining with on-site samples, the paper made analysis of SP abnormality of high resistivity pay zones.

There are many difficulties for judging reservoir and fluid properties because of the Feixianguan Ertan high resistivity zones in the north-east Sichuan.

In waterflood-production oilfields, formation water resistivity of water-flooded zone is not only the basic parameter for water-flooded zone evaluation but also the "bottle neck" which restrict water-flooded zone evaluation.

Based on large number of core experiment data, a method for quantitatively deriving formation water salinity (formation water resistivity) and capacity of cation exchange of the theoretical model of spontaneous potential and induced polarization potential is established.