Tank model simulations have shown that regardless of the permeability, if a gas saturated sand is sufficiently thick it is capable of gas recovery. The extent of recovery is dependent on the sand thickness, degree of stimulation via hydraulic fracturing and the minimum economic production rate per well. The minimum permeability thickness (kh) required to attain economic gas recovery was calculated to be 3.0 md-ft. RFT data has shown significant depletion in otherwise non-productive Cooper Basin wells of low kh. Computer modelling has shown that such depletion is a result of drainage from adjacent wells of higher kh. The degree of depletion is related to the magnitude of the higher kh, the ratio of the khs in adjacent wells and the relative proportion of high kh to lower kh in between wells.