Changes

(A) The accumulation of hydrocarbons in the stratigraphic trap as a result of loss updip porosity. Calcite cementation happened to overburden contact oil / water. (B) With folding contact of oil / water layer is at end position a reservoir that has no relation with the structure<ref>Aquitaine, E., 1982, Exploration for Carbonate Petroleum Reservoirs: New York, John Wiley & Sons, Inc.</ref>]]

(A) The accumulation of hydrocarbons in the stratigraphic trap as a result of loss updip porosity. Calcite cementation happened to overburden contact oil / water. (B) With folding contact of oil / water layer is at end position a reservoir that has no relation with the structure<ref>Aquitaine, E., 1982, Exploration for Carbonate Petroleum Reservoirs: New York, John Wiley & Sons, Inc.</ref>]]

[[:File:UGM_Subsurface_Fig_4.png|Figure 4]] illustrates the sequence of events associated with diagenetic trap formation. In the example shows the mechanism original trapping with reduced porosity updip as a result of changes facies of grainstone oolitic into calcareous mudstone.

[[:File:UGM_Subsurface_Fig_4.png|Figure 4]] illustrates the sequence of events associated with diagenetic trap formation. In the example shows the mechanism original trapping with reduced porosity updip as a result of changes facies of grainstone oolitic into calcareous [[mudstone]].

At the contact of oil / water in the reservoir is often precipitate calcite cement extensively. This phenomenon generally occurs in some carbonate reservoir which showed no evidence of cementation except in contact area of oil / water. The calcite cement occurrences associated with the reaction of sulfate reducing bacteria which can be explained in the following reaction (Friedman and Sander, 1978).

At the contact of oil / water in the reservoir is often precipitate calcite cement extensively. This phenomenon generally occurs in some carbonate reservoir which showed no evidence of cementation except in contact area of oil / water. The calcite cement occurrences associated with the reaction of sulfate reducing bacteria which can be explained in the following reaction (Friedman and Sander, 1978).