Improving the Accuracy of Active Learning Method via Noise Injection for Estimating Hydraulic Flow Units: An Example from a Heterogeneous Carbonate Reservoir

Due to many reasons, in many occasions, reservoir engineers should analyze the reservoirs with small sets of measurements; this problem is known as the small sample size problem. Because of small sample size problem, modeling techniques commonly fail to accurately extract the true relationships between the inputs and the outputs used for reservoir properties prediction or modeling. In this paper, small sample size problem is addressed for modeling carbonate reservoirs by the active learning method (ALM). In this paper, noise injection technique, which is a popular solution to small sample size problem, is employed to recover the impact of separating the validation and test sets from the entire sample set in the process of ALM. The proposed method is used to model hydraulic flow unitsHydraulic Flow Units (HFUs) (HFUs). HFUs are defined as correlatable and mappable zones within a reservoir which control fluid flow. This study presents quantitative formulation between flow units and well logs data in one of the heterogeneous carbonate reservoir in the Persian Gulf. The results for R and nMSE are equal to 85% and 0.0042 which reflectActive Learning Method theNoise Injection abilityOverfitting of the proposedHydraulic Flow Units (HFUs) methodInk Drop Spread (IDS) when facing with sampleCarbonate reservoir size problem.