There have been a number of major heavy oil discoveries in Oman in recent years. In order to devise efficient and cost effective recovery mechanism careful and detailed subsurface understanding of these fields is critical. To this end, petrophysical understanding plays a critical role, as it represents a basic building block of the static and dynamic models. The field under study is a fractured carbonate reservoir with high viscous oil. It is believed that this reservoir has gone through various cycles of drainage and imbibition. Thus, in addition to the complex geology, understanding of fluid distribution and fluid mobility are among major challenges that detailed petrophysical evaluation needs to address. Understanding these parameters will help determine the feasibility of the recovery methodology to be adopted. This paper details a novel petrophysical workflow that integrates 3D NMR, multi array/multi frequency dielectric measurements, borehole images, and core analysis. The core analysis focused on capillary pressures, Dean-Stark, and rock typing. Fracture studies included detailed image analysis and extensive fall off test for understanding the nature and distribution of the fracture network in the reservoir. The wealth of well data coupled with geological and dynamic data reduced the overall reservoir properties and fluid distribution uncertainties.Dielectric data provided resistivity independent saturations validated by Dean-Stark data. Combining dielectric and 3D NMR data allowed better formation characterization and fluid type evaluation and their present day distribution. Additionally, this combination indicated that water is not at an irreducible state in the reservoir. This was supported by the core saturation height function which indicated that present day saturation should be much higher if the reservoir was in drainage mode. These results were crucial to evaluate development options, underlying uncertainty/risks of this reservoir, and design optimum future data acquisition requirements. TX 75083-3836, U.S.A., fax +1-972-952-9435