Numerical Modelling on CO2 Storage Capacity in Depleted Gas Reservoirs

Making an accurate estimate of the CO2 storage capacity before commencement a carbon capture and (CCS) project is crucial to design feasibility investigation. We present herein numerical modelling study on in depleted gas reservoirs. First, we show simple volumetric equation that gives reservoir, which considers same volume CH4 at reservoir pressure temperature conditions produced from reservoir. Next, validity limitations this are investigated using simulation with various characteristics heterogeneity, aquifer water encroachment, rock compaction its reversibility. Regardless if subjected weak or moderate support, provides as structurally trapped within 1% estimated simulations. The most significant factor influencing reversibility compaction, rather than degree compaction. If rocks have strong hysteresis their expansion behaviour, material balance will overestimate amount structural trapping. All results fairly consistent dissolved component water, 15∼17% CO2. Overall, our presents limitation for estimating capacity, helps designing CCS early stage.