The uppermost Cretaceous and Tertiary in south-central Alberta is an economically viable and geologically unique gas exploration target. New reserves typically occur at shallow depths and at pressures that are as much as two and a half times less than normal hydrostatic pressures. Under these circumstances, conventional testing and logging techniques are ineffective in evaluating these reservoirs. Subsequently, many accumulations of gas have been bypassed and gas resource estimates are overly conservative. The only reliable means of determining the hydrocarbon potential is to use hydrogeological methods in combination with conventional exploration tools. A top to bottom petrophysical analysis was conducted on all the correlated wells in the study that had an adequate log suite to calculate the net reservoir content of each zone. Then by applying the hydrodynamic model and mapping the detailed unit level geology, the resource potential of each unit in the area was determined. This potential is shown in map view and contoured in BCF of potential gas in-place per section. The overall unrisked resource potential for all formations in the study area is 12.62 TCF of gas in-place.