“…Five episodes of fracturing were documented for the Piceance system, only three of which were developed on a regional scale (Verbeek and Grout, 1984b). Grout and Verbeek (1985) suggested that variability among and between the joint systems could be explained by the hypothesis that beds of different mechanical properties and in different locations fractured at different times. Verbeek and Grout (1984b) suggested that variability in timing of fracturing had been related to a variable history of fluid pressure depending on dewatering, diagenesis, and hydrocarbon generation.…”