A Field Study on Simulation of CO_2 injection-ECBM Production and Prediction of CO_2 Storage Capacity in Un-mineable Coal Seam

摘要

Studies have shown that, coal seam, an un-conventional reservoir, is considered as apromising option for CO2 sequestration because of its large CO2 sequestration capacity,long time CO2 trapping and extra enhanced coal-bed methane (ECBM) productionbenefits. However, unlike conventional reservoirs, gas flow in the coal seam can causethe cleat permeability and porosity change during the injection/production process. Inother words, for example, once gas is injected and adsorbed on coal matrix, the matrixwill swell, and the cleat permeability and porosity will decrease correspondently.Because of its special features and the nature of gas retention in CBM reservoirs,simulating the production and injection will have more complexity compared toconventional resources.