A well log that shows the propagation time and attenuation of a 1.1-GHz electromagnetic energy wave propagation through the formation near the borehole. The pad-type antenna assembly of the electromagnetic propagation tool contains two transmitters and two receivers to minimize the effect of hole rugosity and tool tilt. Because the propagation time of water differs sharply from that of oil, gas, or rock, the electromagnetic propagation tool measurement provides a means to identify hydrocarbon zones regardless of the formation water salinity.