Effect of porosity and clays on geophysical and transport properties of sandstone exposed to CO2 injection: Influence of rock heterogeneities on CO2 storage monitoring (NERC Grants NE/X003248/1, NE/X006271/1)
This dataset gathers the data collected during a brine:CO2 flow-through experiments conducted on three sandstones with similar mineralogical compositions (major minerals) but different porosity, clay-size fraction and clay mineralogy. The aim was to study the effect of such heterogeneities on interpretation of geophysical data. Geophysical and transport data were collected before, during and after exposing each sample to CO2, and analysed with basic petrophysical properties. The tests were conducted in the high-pressure, room-temperature (20°C) experimental setup for multi-flow-through tests in the Rock Physics Laboratory at the National Oceanography Centre, Southampton (NOCS), during 2022, as part of the OASIS, EHMPRES and FOCUS projects with funding from the Research Council of Norway (RCN grant no. 280472 - OASIS) and the Natural Environment Research Council (NERC grants NE/X003248/1 - FAPESP-EHMPRES, and NE/X006271/1 - FOCUS). To simulate the specific effective stress conditions of the target CO2 storage reservoir in Aurora (Aker et al., 2021), northern North Sea, the confining and pore pressure conditions of the reservoir were accommodated to our lab temperature conditions. We measured ultrasonic P- and S-wave velocities and attenuations, axial strains and electrical resistivity for an increasing CO2 saturation. The degree of brine saturation was inferred from the electrical resistivity using the modified Archie’s empirical relationship to account for the contribution of clay minerals, based on the Waxman–Smits–Juhasz model (see further details in, e.g., Falcon-Suarez et al. (2021)). We refer to Falcon-Suarez et al. (2020) for further information about the experimental rig and the CO2 injection protocol.
nonGeographicDataset
https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item182705
name: Data
function: download
https://doi.org/10.5285/256981dc-245b-410a-90a4-5f0138583a65
name: Digital Object Identifier (DOI)
function: information
http://data.bgs.ac.uk/id/dataHolding/13608125
eng
geoscientificInformation
publication
2008-06-01
Carbon dioxide
NGDC Deposited Data
Permeability
Resistivity
Carbon capture and storage
revision
2022
NERC_DDC
2022-01-09
2023-01-08
creation
2023-10-19
notApplicable
The experiment involved three steady state brine-CO2 flow-through (BCFT) tests (one per sample) to replicate CO2 storage conditions at North Sea-like reservoirs and evaluate geophysical monitoring techniques. The data include ultrasonic P- and S-wave velocities and their respective attenuation factors (at 600 kHz), axial strains, and electrical resistivity and brine and CO2 flow rates, all normalized with respect to the samples pore volume. Before and after the BCFT, under dry and brine saturated conditions, ultrasonic and transport (permeability when dry; resistivity when wet) properties of the samples were measured along an effective stress path to analyse changes in the hydromechanical properties of the rock samples triggered by CO2 injection.
publication
2011
false
See the referenced specification
publication
2010-12-08
false
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
MS Excel
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National Oceanography Centre, Southampton
originator
University of Oslo and Norwegian Geotechnical Institute
originator
British Geological Survey
distributor
British Geological Survey
pointOfContact
British Geological Survey
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NOTTINGHAM
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United Kingdom
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pointOfContact
2024-04-18