TY - JOUR
T1 - Suitability of depleted gas reservoirs for geological CO2 storage
T2 - A simulation study
AU - Raza, Arshad
AU - Gholami, Raoof
AU - Rezaee, Reza
AU - Rasouli, Vamegh
AU - Bhatti, Amanat Ali
AU - Bing, Chua Han
N1 - Publisher Copyright:
© 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.
PY - 2018/10
Y1 - 2018/10
N2 - Hydrocarbon reservoirs, particularly depleted gas formations, are promising geological sites for CO2 storage. Although there have been many studies on the storage aspects of gas reservoirs, the suitability of these formations in terms of fluid types such as dry, wet, and condensate gas has not been properly addressed at the reservoir level. In this study, an attempt was made to evaluate different gas reservoirs in order to provide an insight into their storage capabilities. A dynamic numerical simulation was carried out to simulate CO2 injection in a synthetic but realistic model of a geologic formation having dry, wet, or condensate gas. The results obtained under particular conditions revealed that the condensate gas medium offers a good storage potential, favorable injectivity, and reasonable pressure buildup over a long period of time, whereas dry gas formations were found to be the least favorable sites for storage among gas reservoirs. A sensitivity analysis was done to evaluate the injection rate and the permeability variation of different media during and after the storage. It indicated that the storage behavior of gas reservoirs is sensitive to the injection rate, and selection of an optimum injection rate might help to achieve a good storage capacity in condensate gas systems. The results also highlighted that CO2 immobilization in gas reservoirs after injection is enhanced due to the reduction of permeability, whereas no heterogeneity effect was observed under different permeability realizations.
AB - Hydrocarbon reservoirs, particularly depleted gas formations, are promising geological sites for CO2 storage. Although there have been many studies on the storage aspects of gas reservoirs, the suitability of these formations in terms of fluid types such as dry, wet, and condensate gas has not been properly addressed at the reservoir level. In this study, an attempt was made to evaluate different gas reservoirs in order to provide an insight into their storage capabilities. A dynamic numerical simulation was carried out to simulate CO2 injection in a synthetic but realistic model of a geologic formation having dry, wet, or condensate gas. The results obtained under particular conditions revealed that the condensate gas medium offers a good storage potential, favorable injectivity, and reasonable pressure buildup over a long period of time, whereas dry gas formations were found to be the least favorable sites for storage among gas reservoirs. A sensitivity analysis was done to evaluate the injection rate and the permeability variation of different media during and after the storage. It indicated that the storage behavior of gas reservoirs is sensitive to the injection rate, and selection of an optimum injection rate might help to achieve a good storage capacity in condensate gas systems. The results also highlighted that CO2 immobilization in gas reservoirs after injection is enhanced due to the reduction of permeability, whereas no heterogeneity effect was observed under different permeability realizations.
KW - CO storage
KW - depleted gas reservoirs
KW - numerical simulation
KW - trapping mechanisms
UR - http://www.scopus.com/inward/record.url?scp=85050819622&partnerID=8YFLogxK
U2 - 10.1002/ghg.1802
DO - 10.1002/ghg.1802
M3 - Article
AN - SCOPUS:85050819622
SN - 2152-3878
VL - 8
SP - 876
EP - 897
JO - Greenhouse Gases: Science and Technology
JF - Greenhouse Gases: Science and Technology
IS - 5
ER -