Abstract
This paper contains reservoir simulation study of carbon 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 CO2areinjected 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 CO2 is injected into the targeted reservoir, it will migrate to the peak of anticline structure located in the southeast of CO2 injection well. The displacement of CO2 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 CO2 is calculated on each case and described as the saturated CO2 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 CO2 layer after the injection process will be evaluated by the potential of injected CO2 monitoring using time-lapse seismic survey in the Gundih field.
Highlights
Gundih field is a gas-producing field located in Central Java
The simulation is done without adding water injection after CO2 injection adding water can lower the depth of CO2 plume to prevent a leaking event on the top of the seal, as it is recommended by Putra (2014)
The reservoir injection simulation which is performed shows the direction of CO2 migration which tends to flow toward the top of the structure
Summary
It is assigned to be the first pilot project for Carbon Storage in Indonesia. In every CCS (Carbon Capture Storage) project, CO2 leakage through available fault needs to be avoided; the migration of injected CO2 should be observed. After the reservoir characterization phase has been completed in the Gundih project (Asikin, et al, 2017), the step to be done is the reservoir simulation phase. The reservoir simulation is very important to the procedures of CO2 geological storage project, because we can evaluate the movement of the injected CO2within the reservoir. Several scenarios have been created which have different rates and length of injection to represent different stages of the Carbon Storage project in Gundih area. The information of CO2 distribution in reservoir is important to realize the effective (low-cost) CO2 storage, because we can use the information in the design of CO2 injection wells
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