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Squeezing of Porewater from Core Samples of DGR Boreholes: Feasibility Study

Mazurek, M.
Oyama, T.
Eichinger, F.
Publication Nuclear Waste Management Organization 22 St. Clair Avenue East, 6th Floor Toronto, Ontario M4T 2S3 Canada: NWMO, 2013
Collection NWMO Technical Report; TR-2013-19
Description 65 p.
Abstract Three archived core samples from boreholes DGR-4, DGR-5 and DGR-6 from the Salina F Unit, Queenston Formation and the Georgian Bay Formation were subjected to squeezing tests at pressures of up to 500 MPa. Two samples did not yield any water, while a total of 0.88 g pore water was obtained from a clay-rich sample from the Blue Mountain Formation (water content = 2.8 wt.%, porosity = 8 %). This water mass was sufficient for a full chemical and water-isotope analysis – the first direct determination of porewater composition in rocks from the DGR boreholes. The results are generally in reasonable agreement with those of independent methods, or the observed differences can be explained. Ancillary investigations included the determination of water content, densities and mineralogy, aqueous extraction of squeezed cores, and SEM investigations to characterise the microtexture of unsqueezed and squeezed rock materials. It is concluded that squeezing is a promising method of porewater extraction and characterisation and is recommended as a complementary method for future studies. Selection criteria for potentially squeezable samples include high clay-mineral content (correlating to high water content) and low carbonate content (low stiffness, limited cementation). Potential artefacts of the method, such as ion filtration or pressure solution, should be explored and quantified in future efforts.
Keywords Pore waterHydrochemistrySqueezingSEMMineralogyPhysical propertiesDGR boreholesOntarioSalina F UnitQueenston FormationGeorgian Bay FormationBlue Mountain Formation
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MAZUREK, M. et al. Squeezing of Porewater from Core Samples of DGR Boreholes: Feasibility Study. 2013

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Deposited on : 2018-01-03

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