Multi-probe low-frequency induction log and high-frequency induction log if the reservoir contains the low resistivity annulus zone

A low resistivity annulus appearing near the well due to reservoir fluid displacement by mud filtrate is a reliable indicator of movable oil presence in reservoir. In practical cases estimation parameters possible based on high-frequency induction logging data analysis. When interpreting other methods its influence signals usually not taken into account. The paper discusses results 5IK and VIKIZ logs numerical simulation which substantiate possibility identifying according multi-probe low-frequency geoelectric conditions typical for Cretaceous mixed-saturation reservoirs Imilorskoye oilfield.