Deterministic seismic inversion and extended elastic impedance (EEI) have been used to obtain quantitative estimates of porosity and shale volume (Vshale) over the Ardmore Field. The optimum EEI angles corresponding to porosity and Vshale were determined from the well logs, together with a lithology indicator. The pre-stack seismic data were projected to the Chi angles corresponding to these three petrophysical indicators and deterministic inversions were performed to obtain three broadband EEI volumes. Three-parameter linear regressions were then performed to estimate quantitative porosity and Vshale volumes from the three EEI seismic volumes. Regions of high porosity and low Vshale have been identified which may suggest possible future drilling locations.