Petrophysical Evaluation Methods: Basal Quartz Formation, Manyberries Area, Alberta


B. W. Davis,
Shell Canada Resources Limited

7th Formation Evaluation Symposium of the
Canadian Well Logging Society in Calgary, October 21, 22, 23 & 24, 1979



Hydrocarbons, both oil and gas, have been discovered in the Basal Quartz Formation in the Manyberries area of south-eastern Alberta. Estimation of producible fluids and hydrocarbons in place has been difficult due to the very shaly nature of the reservoir rock. Calculations of water saturation with no corrections for clay conductivity underestimates the hydrocarbons in place. The Waxman-Smits evaluation technique, which provides a method to account for clay conductivities, was used to estimate water saturation based on total porosity. Work of other authors provides a technique to correlate total and effective porosities. This was used to estimate effective porosity and subsequently water saturation based on the effective porosity. Error analysis was undertaken to estimate the uncertainty in the calculated water saturations.