Generate a geological reservoir model. Define reservoir in terms of continuity, lithology, facies distribution, structural geometry and style. Using the petrophysical parameters developed from well log analysis, estimate the original oil and gas volume in place. Establish geological reservoir model define, objectives and modeling tasks. Review reservoir architecture, reservoir properties and their distribution, and integrate for construction of a static geological model. Integrate seismic horizons and facies into the geological model. Estimate original hydrocarbons in place.