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Nooner, S L; Eiken, Ola; Hermanrud, Christian; Sasagawa, Glenn S; Stenvold, Torkjell; Zumberge, Mark A (2007): (Table 1) Gravity and pressure within the Sleipner area relative to ones at the reference station in 2002 and 2005 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.803869, Supplement to: Nooner, SL et al. (2007): Constraints on the in situ density of CO2 within the Utsira formation from time-lapse seafloor gravity measurements. International Journal of Greenhouse Gas Control, 1, 198-214, https://doi.org/10.1016/S1750-5836(07)00018-7

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Abstract:
At Sleipner, CO2 is being separated from natural gas and injected into an underground saline aquifer for environmental purposes. Uncertainty in the aquifer temperature leads to uncertainty in the in situ density of CO2. In this study, gravity measurements were made over the injection site in 2002 and 2005 on top of 30 concrete benchmarks on the seafloor in order to constrain the in situ CO2 density. The gravity measurements have a repeatability of 4.3 µGal for 2003 and 3.5 µGal for 2005. The resulting time-lapse uncertainty is 5.3 µGal. Unexpected benchmark motions due to local sediment scouring contribute to the uncertainty. Forward gravity models are calculated based on both 3D seismic data and reservoir simulation models. The time-lapse gravity observations best fit a high temperature forward model based on the time-lapse 3D seismics, suggesting that the average in situ CO2 density is about to 530kg/m**3. Uncertainty in determining the average density is estimated to be ±65 kg/m**3 (95% confidence), however, this does not include uncertainties in the modeling. Additional seismic surveys and future gravity measurements will put better constraints on the CO2 density and continue to map out the CO2 flow.
Coverage:
Median Latitude: 58.374667 * Median Longitude: 2.542977 * South-bound Latitude: 58.362700 * West-bound Longitude: 1.901200 * North-bound Latitude: 58.388700 * East-bound Longitude: 19.657000
Date/Time Start: 2002-01-01T00:00:00 * Date/Time End: 2005-01-01T00:00:00
Event(s):
ef2002  * Latitude: 58.370000 * Longitude: 2.000000 * Date/Time: 2002-01-01T00:00:00 * Location: Sleipner * Campaign: EF2002 * Basis: Edda Freya * Method/Device: Gravimetry (GRAV)
nm2005  * Latitude: 58.370000 * Longitude: 2.000000 * Date/Time: 2005-01-01T00:00:00 * Location: Sleipner * Campaign: NM2005 * Basis: Normand Mjolne * Method/Device: Gravimetry (GRAV)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEventNooner, S L
2 CommentCommentNooner, S L
3 LATITUDELatitudeNooner, S LGeocode
4 LONGITUDELongitudeNooner, S LGeocode
5 DATE/TIMEDate/TimeNooner, S LGeocode
6 ReplicatesRepl#Nooner, S L
7 GravityGravitymGalNooner, S L
8 In-situ pressureSigmakPaNooner, S L
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
240 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Comment		3 
Latitude		4 
Longitude		5 
Date/Time		6 
Repl [#]		7 
Gravity [mGal]		8 
Sigma [kPa]
ef2002 SP0158.38421.9012200244.764441.5851
ef2002SP0258.38211.9125200234.437533.6682
ef2002SP0358.38121.9173200234.314131.0152
ef2002SP0458.38031.9222200244.142027.9551
ef2002SP0558.37941.9269200234.008725.5377
ef2002SP0658.37861.9319200233.882022.9969
ef2002SP0758.37801.9351200233.800222.1030
ef2002SP0858.37681.9413200233.527919.5980
ef2002SP0958.37591.94642002153.317417.7361
ef2002SP1058.37501.9513200233.150515.7740
ef2002SP1158.37421.9560200232.825413.7904
ef2002SP1258.37321.9609200232.629712.1591
ef2002SP1358.372419.6570200232.440210.4819
ef2002SP1458.37121.9722200232.04039.2097
ef2002SP1558.37001.9787200231.71607.6249
ef2002SP1658.36861.9868200241.28535.1286
ef2002SP1758.36711.9948200230.94773.2265
ef2002SP1858.36562.0029200230.48581.8225
ef2002SP1958.36412.0110200230.05890.5356
ef2002SP2058.36272.0191200250.00000.0000
ef2002SP2158.38171.9411200234.182320.7117
ef2002SP2258.38021.9492200233.943717.5053
ef2002SP2358.37871.9573200233.590414.1962
ef2002SP2458.37321.9355200232.972520.6325
ef2002SP2558.37171.9436200232.583917.5178
ef2002SP2658.37021.9516200232.210814.4556
ef2002SP2758.38441.9520200244.402216.8407
ef2002SP2858.38871.9548200244.974317.0307
ef2002SP2958.36741.9408200232.080916.8690
ef2002SP3058.36321.9379200241.537515.6765
nm2005 SP0158.38421.9012200524.707043.0740
nm2005SP0258.38211.9125200524.413633.7076
nm2005SP0358.38121.9173200524.276432.3748
nm2005SP0458.38031.9222200534.121727.8403
nm2005SP0558.37941.9269200543.993525.2382
nm2005SP0658.37861.9319200533.875022.7521
nm2005SP0758.37801.9351200533.789522.0779
nm2005SP0858.37681.9413200533.532719.3918
nm2005SP0958.37591.94642005123.304618.4856
nm2005SP1058.37501.9513200533.143216.0283
nm2005SP1158.37421.9560200532.825013.8325
nm2005SP1258.37321.9609200532.627412.4415
nm2005SP1358.372419.6570200532.425511.1114
nm2005SP1458.37121.9722200532.03529.6559
nm2005SP1558.37001.9787200521.72377.2191
nm2005SP1658.36861.9868200531.27795.8440
nm2005SP1758.36711.9948200530.93234.2854
nm2005SP1858.36562.0029200530.48791.8706
nm2005SP1958.36412.0110200530.04041.4732
nm2005SP2058.36272.0191200550.00000.0000
nm2005SP2158.38171.9411200534.189120.3627
nm2005SP2258.38021.9492200533.940917.6863
nm2005SP2358.37871.9573200533.604013.8816
nm2005SP2458.37321.9355200532.954121.1945
nm2005SP2558.37171.9436200532.577018.1675
nm2005SP2658.37021.9516200532.213514.4788
nm2005SP2758.38441.9520200534.439814.4265
nm2005SP2858.38871.9548200524.968917.5382
nm2005SP2958.36741.9408200532.090616.2933
nm2005SP3058.36321.9379200521.539915.5697