Figure 5-2. Porosity versus depth of burial relationships for shale and clayey sediments (after Rieke and Chilingarian, 1974) showing the estimated maximum PFRD depth range based on the mean and the upper and lower standard deviation ranges for the calculated paleoporosity of the Rhinestreet shale. The dashed normal compaction trend, which was used to define the maximum depth for the Rhinestreet shale PFRD, is from Ham (1966); all other trends predict a shallower PFRD. MBD = modeled maximum burial depth of the Rhinestreet shale.