Changes

===Recrystallization===

===Recrystallization===

Recrystallization of carbonates and the alteration of grains and cements to clays can have a significant impact on reservoir quality in sandstones and carbonates. Dolomitization of limestones or calcite cement in sandstones typically increases porosity and permeability. Similarly, clay replacement may increase overall porosity of the rock; however, the pores associated with clay minerals tend to be micropores that contain irreducible water. Also, delicate clay flakes may become mobile with flowing pore fluids and migrate to, and clog, pore throats.

Recrystallization of carbonates and the alteration of grains and cements to clays can have a significant impact on reservoir quality in sandstones and carbonates. Dolomitization of limestones or calcite cement in sandstones typically increases porosity and permeability. Similarly, clay replacement may increase overall porosity of the rock; however, the pores associated with clay minerals tend to be micropores that contain [http://petrowiki.org/Glossary%3AIrreducible_water_saturation irreducible water]. Also, delicate clay flakes may become mobile with flowing pore fluids and migrate to, and clog, pore throats.

===Structural deformation===

===Structural deformation===