Simulation of time lapse seismic for CO2-injection monitoring: preliminary result

Simulation of time lapse seismic is conducted in the frame work of carbon storage pilot project that will be carried out in the Gundih Field and surrounding areas, Indonesia. The purpose of conducting this study is to find out whether the results of time lapse seismic simulation could detect the presence of CO2 in the determined CO2 reservoir, since the amount of CO2 that will be injected is only 20,000 tonnes within 2 years. The CO2-injection will is planned to be started from December 2016 or beginning of 2017 at the latest. This experiments is carried out as justification whether this approach could show significant seismic anomalies between before and after CO2-injection. At this stage, the method is tested by using synthetic geological model that assume maximum amount of CO2 could be injected, so that it filled all of the capacity of the reservoirs. The geological model itself was developed based on the results of seismic inversion, in which the physical properties inside the model were distributed from seismic and logs data. Two injection scenarios were proposed by utilizing two different reservoirs in order to see the effectiveness of the injection as well as the resulting seismic response. The results of this study will be a reference to the next step, i.e. reservoir simulation by using the obtained models.