ReservoirGrail is not a typical reservoir simulator because it employs a unique patented approach called Time Dynamic Volumetric Balancing © (TDVB) to model the migration of reservoir fluids (oil, gas, and water) through time. Unlike traditional flow simulators (Darcy’s Law simulators), ReservoirGrail does not carry the burden of solving highly non-linear equations. Instead, using the minimal data input necessary to calculate reservoir volumes (thickness, porosity, and saturations), ReservoirGrail allows the user to quickly model the past, present, and future reservoir conditions.