Application of material balance methods to CO2 storage capacity estimation within selected depleted gas reservoirs

Clarke, A.L.; Imber, J.; Davies, R.J.; van Hunen, J.; Daniels, S.E.; Yielding, G.

Abstract

Depleted gas reservoirs are potential sites for CO2 storage; therefore, it is important to evaluate their storage capacity. Historically, there have been difficulties in identifying the reservoir drive mechanism of gas reservoirs using traditional P/z plots, having direct impacts for the estimation of the original gas in place (OGIP) and dependent parameters for both theoretical and effective CO2 storage capacity estimation. Cole plots have previously provided an alternative method of characterization, being derived from the gas material balance equation. We use production data to evaluate the reservoir drive mechanism in four depleted gas reservoirs (Hewett Lower Bunter, Hewett Upper Bunter, and North and South Morecambe) on the UK Continental Shelf. Cole plots suggest that the North Morecambe and Hewett Upper Bunter reservoirs experience moderate water drive. Accounting for cumulative water influx into these reservoirs, the OGIP decreases by up to 20% compared with estimates from P/z plots. The revised OGIP values increase recovery factors within these reservoirs; hence, geometrically based theoretical storage capacity estimates for the North Morecambe and Hewett Upper Bunter reservoirs increase by 4 and 30%, respectively. Material balance approaches yield more conservative estimates. Effective storage capacity estimates are between 64 and 86% of theoretical estimates within the depletion drive reservoirs, and are 53 – 79% within the water drive reservoirs.

Citation

Clarke, A., Imber, J., Davies, R., van Hunen, J., Daniels, S., & Yielding, G. (2017). Application of material balance methods to CO2 storage capacity estimation within selected depleted gas reservoirs. Petroleum Geoscience, 23(3), 339-352. https://doi.org/10.1144/petgeo2016-052

• Journal Article Type: Article
• Acceptance Date: Apr 5, 2017
• Online Publication Date: Jun 27, 2017
• Publication Date: Jun 27, 2017
• Deposit Date: Apr 18, 2017
• Publicly Available Date: Jun 27, 2018
• Journal: Petroleum Geoscience
• Print ISSN: 1354-0793
• Electronic ISSN: 2041-496X
• Publisher: European Association of Geoscientists and Engineers (EAGE)
• Peer Reviewed: Peer Reviewed
• Volume: 23
• Issue: 3
• Pages: 339-352
• DOI: https://doi.org/10.1144/petgeo2016-052
• Public URL: https://durham-repository.worktribe.com/output/1360429