Changes

===Sandstone pore systems===

===Sandstone pore systems===

Four basic porosity types can be recognized in sandstones:<ref name=pt05r127>Pittman, E. D., 1979, Porosity, diagenesis, and productive capability of sandstone reservoirs, in Scholle, P. A., Schluger, P. R., eds., Aspects of Diagenesis: Society Economic Paleontologists and Mineralogists Special Publication 26, p. 159–173.</ref> (1) intergranular (primary), (2) microporosity, (3) dissolution (secondary), and (4) [[fracture]] ([[:file:porosity_fig2.png|Figure 2]]). Intergranular porosity exists as space between detrital grains. Microporosity exists as small pores (less than 2 μm) commonly associated with detrital and authigenic clay minerals. Dissolution porosity is the pore space formed from the partial to complete dissolution of framework grains and/or cements. Fracture porosity is the void space associated with natural fractures.

Four basic porosity types can be recognized in sandstones:<ref name=pt05r127>Pittman, E. D., 1979, Porosity, diagenesis, and productive capability of sandstone reservoirs, in P. A. Scholle, and P. R. Schluger, eds., Aspects of Diagenesis: Society Economic Paleontologists and Mineralogists Special Publication 26, p. 159–173.</ref> (1) intergranular (primary), (2) microporosity, (3) dissolution (secondary), and (4) [[fracture]] ([[:file:porosity_fig2.png|Figure 2]]). Intergranular porosity exists as space between detrital grains. Microporosity exists as small pores (less than 2 μm) commonly associated with detrital and authigenic clay minerals. Dissolution porosity is the pore space formed from the partial to complete dissolution of framework grains and/or cements. Fracture porosity is the void space associated with natural fractures.

===Carbonate pore systems===

===Carbonate pore systems===