title: A Model To Estimate Carbon Dioxide Injectivity and Storage Capacity for Geological Sequestration in Shale Gas Wells.
abstract: Recent studies suggest the possibility of CO2 sequestration in depleted shale gas formations, motivated by large storage capacity estimates in these formations. Questions remain regarding the dynamic response and practicality of injection of large amounts of CO2 into shale gas wells. A two-component (CO2 and CH4) model of gas flow in a shale gas formation including adsorption effects provides the basis to investigate the dynamics of CO2 injection. History-matching of gas production data allows for formation parameter estimation. Application to three shale gas-producing regions shows that CO2 can only be injected at low rates into individual wells and that individual well capacity is relatively small, despite significant capacity variation between shale plays. The estimated total capacity of an average Marcellus Shale well in Pennsylvania is 0.5 million metric tonnes (Mt) of CO2, compared with 0.15 Mt in an average Barnett Shale well. Applying the individual well estimates to the total number of existing and permitted planned wells (as of March, 2015) in each play yields a current estimated capacity of 7200-9600 Mt in the Marcellus Shale in Pennsylvania and 2100-3100 Mt in the Barnett Shale.
authors.affiliation: †Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, United States.
authors.forename: Ryan W J
authors.initials: RW
authors.lastname: Edwards
authors.affiliation: †Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, United States.
authors.forename: Michael A
authors.initials: MA
authors.lastname: Celia
authors.affiliation: †Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, United States.
authors.forename: Karl W
authors.initials: KW
authors.lastname: Bandilla
authors.affiliation: ‡Institute of Petroleum Engineering, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom.
authors.forename: Florian
authors.initials: F
authors.lastname: Doster
authors.affiliation: †Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, United States.
authors.forename: Cynthia M
authors.initials: CM
authors.lastname: Kanno
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis*; D003198:Computer Simulation; D019015:Geologic Sediments / Q000737:chemistry*; D008697:Methane / Q000032:analysis; D008962:Models, Theoretical; D059206:Natural Gas / Q000032:analysis; D061329:Oil and Gas Fields / Q000737:chemistry*; D010414:Pennsylvania; D011312:Pressure; D013997:Time Factors
chemical_list: D059206:Natural Gas; D002245:Carbon Dioxide; D008697:Methane