Changes

The question about in what depth that porosity of carbonate rocks formed seems like a simple question. But in fact, it’s impossible to calculate the relationship between porosity and depth.

The question about in what depth that porosity of carbonate rocks formed seems like a simple question. But in fact, it’s impossible to calculate the relationship between porosity and depth.

[[FIG 2]]

[[File:UGM_Subsurface_Fig_2.png|thumb|300px|{{figure number|2}]]

The important point which showed from Figure 2 is :

The important point which showed from Figure 2 is :

In addition to relation of the porosity and depth forming, there are relationship between porosity break-up and depth. Figure 3. showing a main process of porosity break-up depends on the depth where it’s process occurs. These diagram is subjective, but can showing more of porosity breaking up thats occurs near the earth surface where the sediment submiting, thats have compaction and early cementation.

In addition to relation of the porosity and depth forming, there are relationship between porosity break-up and depth. Figure 3. showing a main process of porosity break-up depends on the depth where it’s process occurs. These diagram is subjective, but can showing more of porosity breaking up thats occurs near the earth surface where the sediment submiting, thats have compaction and early cementation.

[[FIG 3]]

[[File:UGM_Subsurface_Fig_3.png|thumb|300px|{{figure number|3}]]

Process that can breaking up the porosity there are late-cementation which generally related with pressure solution at the same rocks or in adjacent and pressure solution which reducing the porosity by solution in grain contact or pore type changing along sthylolite. The important point from there are many porosity showed reduction at shallow depth by the easily predictable process. Porosity that forming at the shallow depth can moving to the deep subsurface may be preserve without sthylolitization. If there are occurs sthylolitization, the last cementation occurs generally. (Wong and Oldershaw, 1981)

Process that can breaking up the porosity there are late-cementation which generally related with pressure solution at the same rocks or in adjacent and pressure solution which reducing the porosity by solution in grain contact or pore type changing along sthylolite. The important point from there are many porosity showed reduction at shallow depth by the easily predictable process. Porosity that forming at the shallow depth can moving to the deep subsurface may be preserve without sthylolitization. If there are occurs sthylolitization, the last cementation occurs generally. (Wong and Oldershaw, 1981)