The area of Chona field that is explored with transient electromagnetic survey is 3350 square kilometers that is about 50 % of the whole license area. At the moment the approaches to integration TEM data in geological modelling directly are developed since taking into account TEM data can reduce uncertainty of reservoir saturation. The approach to analysis of TEM data and its application in geological modelling process to determine reservoir saturation and reduce uncertainty of OWC/ GOC is provided. The process is a multivariant modelling of electrical properties as specific electrical resistance and longitudinal conductance that correspond to geological realizations and comparison of synthetic electrical properties with properties that were obtained from TEM data inversion. The problem of geological realization ranking and optimal value of uncertain parameters determination is solved with calculation of residual error between synthetic electrical parameters and measured ones..