Abstract
Based on experiments of rock's electrical parameter dispersion properties in both water displacing oil and oil displacing water processes, it is found that the frequency dispersion properties of electrical parameters in water‐bearing rocks are quite different from that in oil‐bearing rocks. Oil saturation can severely impact the rock's electrical parameter dispersion properties, and as the oil saturation increases, the properties are more distinguishing. The variation of formation water salinity has a big effect on the rock's resistivity, hence the module of the rock's complex resistivity varies with water saturation, and a U‐shaped curve occurs over single frequency, just like the normal resistivity. However, the effect of formation water salinity on the rock's frequency dispersion is less than that of oil saturation. As a result, the rock's electrical parameter dispersion properties will have a strong application potential in the evaluation of watered‐out zones as well as identification of oil bearing zone and water bearing zone.
Published Version
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