The example below shows Blasingame Plot for Colorado Shale gas well from Alberta, Canada (the Colorado Group is often considered a Hybrid Shale) . Although the unfiltered data appears to provide a clear signature in the PSS regime, there is minimal data in the transient period. Perhaps transient parameters such as unique permeability and skin are non-unique. Part of the problem may be that only monthly volumes were available. One could say that potentially only PSS Models are most applicable in this scenario.
A constant flowing pressure was used despite the somewhat variable flow rates. The history match is somewhat poor towards end of the data set. In fact, there could potentially be no correlation between flowing pressure and rate which might render the entire analysis suspect.
