In this paper, simulation is carried out to determine the relationship between the resistivity contrast and the thickness depth of the Hydrocarbon reservoir in seabed logging application. In order to establish this correlation, various simulation models are carried out using Computer Simulation Technology (CST) tool and the results obtained from each simulation is plotted as graphs using MATLAB. The simulations are performed, by varying individually the resistivity contrast and the thickness depth, at each seawater depth. The results from the simulations, illustrate that the resistivity contrast and the thickness depth of the Hydrocarbon have a direct relationship and that at significant values, they clearly signify the presence of Hydrocarbon under the seabed floor.