Change search
ReferencesLink to record
Permanent link

Direct link
Integrated electromagnetic data investigation of a Mesozoic CO2 storage target reservoir-cap-rock succession, Svalbard
Faculty of Science and Technology, UiT-The Arctic University of Norway.
Department of Arctic Geology, The University Centre in Svalbard.
Oulu Mining School, Geophysics, University of Oulu.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Show others and affiliations
Number of Authors: 5
2016 (English)In: Journal of Applied Geophysics, ISSN 0926-9851, E-ISSN 1879-1859Article in journal (Refereed) Epub ahead of print
Abstract [en]

Recently acquired time-domain electromagnetic (TEM) and magnetotelluric (MT) data sets are utilized in the first electromagnetic (EM) characterization of a geological CO2 storage target site in Adventdalen, Arctic Norway. Combining the two EM data sets enabled to resolve the electrical resistivity structure of the target site better than either of the methods alone. 2D inverting the MT data in the audio period interval (0.003–1 s) with supporting input derived from the TEM data (0.01–10 ms) provided a geologically meaningful resistivity model that included information not previously evident from existing seismic and borehole data. The ca. 1.8 × 1 km 2D resistivity model displays a laterally constrained highly conductive anomaly (ca. 10 Ω m) at about 400–500 m depth, where reflectors of a parallel seismic section are concealed and core samples indicate a highly fractured décollement zone formed during Paleogene compression. The base of the permafrost is imaged at ca. 200 m depth. Synthetic inversion tests, however, suggest that this may be exaggerated by tens of meters, due to a thin conductive layer present approximately between 10 and 25 m depth. The resistivity model does not give indication for a fluid pathway we can connect to leakage, in line with water injection and leak-off tests in the reservoir and cap-rock, both of which indicate a sealing shale-dominated cap-rock separating an over-pressured compartment above the sealing shale from a severely under-pressured reservoir interval. The results we present indicate the advantage of integrating EM exploration techniques in a CO2 reservoir-cap-rock study to obtain a more complete picture.

Place, publisher, year, edition, pages
2016.
National Category
Geophysics
Research subject
Exploration Geophysics
Identifiers
URN: urn:nbn:se:ltu:diva-60720DOI: 10.1016/j.jappgeo.2016.11.021OAI: oai:DiVA.org:ltu-60720DiVA: diva2:1050091
Available from: 2016-11-28 Created: 2016-11-28 Last updated: 2016-12-03

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Smirnov, Maxim
By organisation
Geosciences and Environmental Engineering
In the same journal
Journal of Applied Geophysics
Geophysics

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 15 hits
ReferencesLink to record
Permanent link

Direct link