Assessing the Feasibility of CO2 Sequestration in Liquid-rich Shale Gas Reservoirs with Potential Enhanced Gas Recovery

Jie Zhan


In this presentation, an integrated methodology is provided to investigate the CO2 sequestration process in liquid-rich shale gas reservoirs. And the effect of multicomponent desorption/adsorption on reservoir performance is highlighted. The Eagle Ford liquid-rich shale gas reservoir is an ideal target for the CO2 sequestration. To some extent, the average reservoir pressure is maintained due to injection of CO2. But most of the pressure is trapped around the injector due to the tight formation. That is why the reservoir productivity is enhanced by the injection process. But the increment is not substantial. The pressure maintenance around the injector reduces the effect of the liquid-blockage, which is a good sign to implement the cyclic inert gas injection to reduce the effect of the liquid-blockage and enhance the reservoir performance ultimately. In addition, we cannot ignore the contribution of slip flow and diffusion to the reservoir performance during the sequestration process.