Deep water and deep target environment for Seabed Loging (SBL) has been a challenge, and the better delineation method is needed. This paper describes the curve fitting methods namely smoothing spline and piecewise cubic Hermite interpolating polynomial (PCHIP) to give better delineation. In this work we simulated five geophysical layers namely air (500m), sea water (2000m), over burden (1000m), hydrocarbon (100m) and under burden (1000m) respectively. Target depth was increased gradually by 500m from 1000m to 3000m at constant frequency of 0.125Hz and 1250A current. Due to the weak electromagnetic signal from deep target of SBL we had chosen curve fitting methods to describe hydrocarbon reservoir. The results show that smoothing spline is quantified as compare to the PCHIP due to the existence of various noises in the SBL data. Several numerical results will be presented.

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