Application of material balance methods to CO2 storage capacity estimation within selected depleted gas reservoirs
Posted on 2017-06-15 - 11:27
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
moderatewater drive. Accounting for cumulativewater 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.
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Clarke, A. L.; Imber, J.; van Hunen, J.; Daniels, S. E.; Yielding, G. (2017). Application of material balance methods to CO2 storage capacity estimation within selected depleted gas reservoirs. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.3803770.v1
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AUTHORS (5)
AC
A. L. Clarke
JI
J. Imber
Jv
J. van Hunen
SD
S. E. Daniels
GY
G. Yielding
CATEGORIES
KEYWORDS
UK Continental ShelfHewett Upper Bunter reservoirs experience moderatewater drivecole plotsmaterial balance approachesreservoir drive mechanismCO 2 storage capacity estimationNorth Morecambegas reservoirs Depleted gas reservoirsmaterial balance methodsCO 2 storagewater drive reservoirsuse production dataHewett Upper Bunter reservoirs increasedepletion drive reservoirsgas reservoirsstorage capacity estimatesOGIP values increase recovery factorsgas material balance equationEffective storage capacity estimatesHewett Upper BunterGeology