Resources & Systems International, Inc.
Watershed Planning • Resources Management • Environmental Solutions • Ecological Risk Assessment

OILVOL 2.0 Oil Volume Estimator from a Network of Monitoring Wells With OILVOL from Resources & Systems International, Inc, users can estimate the free hydrocarbon volume in a soil and compute the volume of residual NAPL in the saturated and unsaturated zones. To obtain these values, the user enters the depth to air-oil and oil-water interfaces measured in monitoring wells, van Genuchten soil moisture retention parameters (which can be estimated with RASI's SOILPARA), and fluid properties. Three phase constitutive relations are used to obtain the vertical distribution of fluid saturations, which are integrated in OILVOL to compute the free product (true product) volume in the soil. OILVOL can also estimate the residual oil volume in the unsaturated and saturated zones after oil skimming. When fluctuations in the fluid tables (air-oil, oil-water) are high, as those resulting from the operation of water and oil recovery wells, and/or when regional groundwater gradients are high and hydrogeology is complex, we recommend the use of RASI's MARS model which estimates transient areal migration, LNAPL/water recovery, and free and trapped NAPL volumes in the vadose/saturated zones. Model with OILVOL Estimate free hydrocarbon volume from fluid level measurements in monitoring wells Compute volume of residual NAPL in the saturated and unsaturated zones Model with OILVOL Domain size Monitoring well locations Air-oil and oil-water interface depths in each monitoring well Soil and hydrocarbon properties Model with OILVOL Total free product Total residual oil in the saturated and unsaturated zones Distribution throughout the modeling domain Contouring interface with Golden Software's Surfer for total oil volume and pressure Oil distribution files for BIOF&T