Uncertainty Evaluation Method and Application of Reservoir Lithofacies Proportion under the Condition of Few Wells

Abstract The proportion of different lithofacies is essential to determine the net-gross ratio, which directly affects calculation oil and gas reserves. Under condition few wells, reliability proportions obtained using well data poor because it difficult estimate uncertainty variation range proportions. present study overcomes this problem an evaluation method for reservoir proportion. First, are determined seismic considered as most likely estimated. Based on proportion, models area developed. Second, uniform random methods applied sample models, then, probability distribution functions derived. Third, three levels in calculated quantile discretization distribution. Finally, we take M field a compare test results fixed structures. show that sampling structure model significantly deviate under influence extension direction channel pattern Therefore, suggested use