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This paper contains reservoir simulation study of c arbon storage at Gundih field in Central Java Island, Indonesia. Two different cases of injection simulation were performed and analyzed in this paper. The cases represent the conditions when the smallest and largest volumes of CO 2 are injected into the subsurface to see the changes of reservoir that happen after the injection processes. The simulation result shows that when a larger amount of CO 2 is injected into the targeted reservoir, it will migrate to the peak of anticline structure located in the southeast of CO 2 injection well. The displacement of CO 2 in the simulation progress shows that it will not reach the fault location. The geological model for synthetic seismogram calculation is then built based on the simulation reservoir result. The furthest displacement of CO 2 is calculated on each case and described as the saturated CO 2 layers. Forward modeling is performed to create synthetic seismic gather which will be processed to construct seismic section. The difference between the initial seismic section before the injection process and seismic section including saturated CO 2 layer after the injection process will be evaluated by the potential of injected CO 2 monitoring using time-lapse seismic survey in the Gundih field.

Forward Modeling Time-Lapse Seismic based on Reservoir Simulation Result on The CCS Project at Gundih Field, Indonesia