A new exploration technology, called Seabed Logging (SBL) method has been developed to detect the location of hydrocarbon beneath seabed using Electromagnetic (EM) wave. Although this method has been able to detect reservoir up to 1000 m deep, it is less effective on the detection of deeper reservoir. This paper discusses the effectiveness of SBL method for the detection of deep hydrocarbon reservoir using various frequencies of EM wave via Computer Simulation Technology (CST) software. Simulation using CST software was conducted to determine the Magnitude of EM wave Versus Offset (MVO) for various depth of target and various EM frequencies. The simulation result shows that less effective results were shown in deep target when high frequency EM was used due to the attenuation of the waves as it reflected from the target. It was observed that while high frequency EM is able to detect shallow reservoirs, low frequency EM is more effective for deeper targets beneath the seabed. © 2012 IEEE.