Not all the Nisku bank-edge oil pools may be well connected to the main Nisku shelf aquifer. Bank-edge pools that lie within the 300-metres head contour such as in T. 49, R. 8W5, are likely to be well connected. The 300m head line marks the beginning of a closer grouping of head lines that extends out into the Cynthia shale basin and across the Nisku bank in the southwest part of the study area (T. 47, R. 10W5). This closer grouping of head lines likely marks the beginning of a loss in permeability within the Nisku Reservoir. Pools within the area where the head lines have a close grouping (T. 47, R. 11W5; T. 48, R. 9W5) likely have restricted access to the regional Nisku shelf aquifer.