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TitleGeological characterization of the Aquistore CO2 storage site from 3D seismic data
AuthorWhite, D J; Hawkes, C D; Rostron, B J
SourceInternational Journal of Greenhouse Gas Control vol. 54, pt. 1, 2016 p. 330-344,
Alt SeriesEarth Sciences Sector, Contribution Series 20150487
Mediapaper; on-line; digital
File formatpdf; html
Lat/Long WENS-103.1167 -103.0333 49.1167 49.0667
Subjectsgeophysics; regional geology; tectonics; environmental geology; geophysical surveys; seismic surveys, ground; geophysical logging; well logging; bedrock geology; lithology; sedimentary rocks; clastics; shales; evaporites; basement geology; structural features; faults; structural analyses; seismic risk; seismicity; earthquakes; reservoirs; stratigraphic analyses; Winnipeg Formation; Icebox Member; Deadwood Formation; Prairie Formation; Watrous Formation; Colorado Group; Bearpaw Formation; CO2 storage; aquitards; caprock; seismotectonics; flexures; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Cretaceous; Jurassic; Triassic; Paleozoic; Permian; Carboniferous; Devonian; Silurian; Ordovician; Cambrian; Precambrian
Illustrationslocation maps; stratigraphic charts; tables; seismic profiles; well logs; geophysical images; schematic diagrams
ProgramCarbon Capture & Storage, Environmental Geoscience
AbstractA 30 km2 3D seismic survey was conducted in 2012 at the Aquistore CO2 storage site near Estevan, Saskatchewan, Canada. The purpose of the survey was to investigate the geological suitability of this site for the purposes of long-term CO2 storage. The resultant 3D seismic volume has been interpreted in con-junction with geological and geophysical logs from the 3400 m deep CO2 injection well (01/5-6-2-8-W2M) that was subsequently drilled. The CO2 storage reservoir resides immediately above the Precambrian crystalline basement (3400 m) and is part of a regionally extensive >200 m-thick clastic interval (Winnipeg and Deadwood formations). The reservoir is capped by a 15 m thick laterally-continuous shale unit (Icebox Member of the Winnipeg Formation). A regional evaporite at ~2500 m depth (Prairie Formation) provides a secondary barrier to vertical flow. It is >150 m thick and shows no salt dissolution features. Above the Prairie Formation are 1500 m of laterally continuous Middle Devonian to Lower Cretaceous strata and 1000 m of Upper Cretaceous and younger sedimentary rocks, including additional regionally-extensive aquitards that provide tertiary seals: Watrous Formation (~120 m), Colorado Group (>185 m),and Bearpaw Formation. There is no evidence of vertical faulting extending through the Devonian or deeper section. A local sub-vertical Precambrian basement fault is interpreted to exist. It lies beneath a flexure within the overlying Cambrian to Silurian strata. The fault is oriented at an azimuth of 75? - 85? relative to the regional maximum horizontal stress making it less susceptible to reactivation during CO2 injection. There is no clear evidence that the strata in an overlying flexure are ruptured or faulted. Natural seismicity in the area is very low and the nearest known significant seismogenic fault zone is located ~200 km away.
Summary(Plain Language Summary, not published)
3D seismic data were acquired and interpreted at the Aquistore CO2 storage site in 2012 prior to the drilling of a CO2 injection well. The purpose of the seismic study was to ensure that the site was suitable for the long-term storage of CO2. Interpretation of the 3D data show that the storage reservoir should have adequate capacity and the overlying geological sealing units are competent. A Precambrian subvertical basement fault is associated with a flexure in the overlying reservoir rocks. The orientation of the interpreted fault is such that it is unlikely to be reactivated by CO2 injection, but will be a focus of the ongoing monitoring program at the site.