Figure 21D. SEM photomicrograph of sidewall core sample. Pore walls coated with partially recrystallized, discontinuous, detrital illite and smectite clays(C). Pore throats (PT) open and well-defined. Intergranular pore (P) lined with partially recrystallized illite (I). KE sandstone, E.I. 330 #B-2, 7934 ft (scale = 10 micrometers).