Changes

Compaction and cementation are important in decreasing porosity, because it can be known by calculating the number and type of the contact between grains in sample from different burial depth, so it can be used to estimate how far the compaction can decrease the original intergranular porosity. Rock with even contact within its grains and has some grain contacts in every area and lower porosity than uncompact rock where contacts are usually tangential and rare. If compaction plays more influence than decreasing porosity, there will be more contacts between grain with depth and contact will increase from tangential contact in shallow depth to stylolite contact in deep depth.

Compaction and cementation are important in decreasing porosity, because it can be known by calculating the number and type of the contact between grains in sample from different burial depth, so it can be used to estimate how far the compaction can decrease the original intergranular porosity. Rock with even contact within its grains and has some grain contacts in every area and lower porosity than uncompact rock where contacts are usually tangential and rare. If compaction plays more influence than decreasing porosity, there will be more contacts between grain with depth and contact will increase from tangential contact in shallow depth to stylolite contact in deep depth.

Because the compaction continues with pressure combination and dissolution, so stylolite will be formed. Generally, stylolite will be found more in mud-supported rocks (Dickinson and Saller, 1995) than in grainstone and packstone that generally decreases porosity and permeability (Nelson, 1981). Post-stylolite diagenesis may result porosity and permeability in light rocks (Dawson, 1988). Seismic and wireline log data can’t distinguish cementation, compaction, recrystallization, dissolution and replacement.

Because the compaction continues with pressure combination and dissolution, so stylolite will be formed. Generally, stylolite will be found more in mud-supported rocks (Dickinson and Saller, 1995) than in grainstone and packstone that generally decreases porosity and permeability (Nelson, 1981). Post-stylolite [[diagenesis]] may result porosity and permeability in light rocks (Dawson, 1988). Seismic and wireline log data can’t distinguish cementation, compaction, recrystallization, dissolution and replacement.

====Decreasing with cementation====

====Decreasing with cementation====