[[Postaccumulation cementation|Cementation]] and [[Reservoir quality#Compaction|compaction]] occur with burial, reducing the reservoir quality of the [[Mud-supported carbonate|mud-supported]] mudstones and wackestones more than the [[Grain-supported carbonate|grain-supported]] packestones and grainstones. The result is a vertical sequence of lower [[porosity]] and [[permeability]] mud-supported rocks at the base and higher porosity and permeability grain-supported rocks at the top. Consequently, the best quality [[Flow units for reservoir characterization|flow unit]] occurs at the top of the sequence . The permeable units are confined to the grainstone [[bar]]s. | [[Postaccumulation cementation|Cementation]] and [[Reservoir quality#Compaction|compaction]] occur with burial, reducing the reservoir quality of the [[Mud-supported carbonate|mud-supported]] mudstones and wackestones more than the [[Grain-supported carbonate|grain-supported]] packestones and grainstones. The result is a vertical sequence of lower [[porosity]] and [[permeability]] mud-supported rocks at the base and higher porosity and permeability grain-supported rocks at the top. Consequently, the best quality [[Flow units for reservoir characterization|flow unit]] occurs at the top of the sequence . The permeable units are confined to the grainstone [[bar]]s. |