The electrical properties of wet rocks from the Saatli well, taken from a depth of 5-7 km, were studied at high pressures and temperatures. Through a comparative analysis of the curves constructed from laboratory measurements and electrical logging data their differences were revealed at depths below 6 km, which could not be compensated by the laboratory modeling method. Thus, it was concluded that the identified differ-ence may be associated with lower saturation of rocks under natural stratification conditions due to the replacement of water with the gas phase. Criteria for identifying the boundary of transition from “wet” to “dry” crust have been determined, which poses the need for a fundamentally new ap-proach to the geological interpretation of electrical exploration data below and above this boundary.