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Reserve prediction is a continuous process during the life of the field due to risk and errors that should be analyzed and considered which represent an endemic problem. In addition, volumetric equation variables such as porosity, net thickness and saturation have burdened in uncertainty issues. As a result, the forecasting reserve was inaccurate. However, the international companies were indeed concerned with accurate reserve estimation process. Furthermore, the accurate definition of hydrocarbon content can be identified at the field depletion. In this research, the volumetric method of reserve estimation used in Mishrif formation / Amara oil field as a case study. In deterministic side, single value of input parameters used, thus the volumetric result obtained was the best single value. On the other hand, in probabilistic side each parameter represented with maximum, minimum, average and the outcomes got by likelihood thickness work (PDF). The outcomes which were gotten by means of volumetric strategy (the two sides of the methodologies) were (1.16 MMMSTB) and demonstrated (P90), demonstrated in addition to plausible (P50) demonstrated in addition to likely in addition to conceivable (P10) were (1.24, 2.22, 3.55 MMMSTB) individually. The sensitivity analysis showed that the net thickness and porosity of the reservoir are the most affected variables in volumetric method with 45% and 27% receptivity. [ABSTRACT FROM AUTHOR]