Abstract:Distribution feature of oil, gas and water in reservoir and physical difference are the bases of geophysical exploration, and it is considered by analysis that geo-electrical difference of reservoir is one of the most distinctive features.Meanwhile, reservoir is also the dynamic multiphase balance system, in which the double electric layer formed from biphase medium is the source produced by induced polarization anomaly of reservoir, and points out the reservoir has geo-electric anomalous pattern of "three-storey annular building".People should develop 3-D high-precision electromagnetic sounding to effectively detect reservoir, study the geo-electric anomalous feature of reservoir from shallow to deep, and paper shows the application cases detecting practical reservoir of "three-storey annular building".