“…Part of such technical innovation lies in understanding the impact of the geological and hydraulic fracturing factors on production, which drives the spatial variability of production in wells. Due to the complexity involved, statistical approaches based on data are preferred over physical modeling approaches (Mohaghegh, 2011(Mohaghegh, , 2013Kormaksson et al, 2015;Grujic et al, 2015). Production rates in wells start from an initial peak in production right after hydraulic fracturing followed by a long multi-month decline.…”