Quantifying the Porosity of Crystalline Rocks by In Situ and Laboratory Injection Methods

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Mori , A , Mazurek , M , Ota , K , Siitari-Kauppi , M , Eichinger , F & Leuenberger , M 2021 , ' Quantifying the Porosity of Crystalline Rocks by In Situ and Laboratory Injection Methods ' , Minerals , vol. 11 , no. 10 , 1072 . https://doi.org/10.3390/min11101072

Title: Quantifying the Porosity of Crystalline Rocks by In Situ and Laboratory Injection Methods
Author: Mori, Andreas; Mazurek, Martin; Ota, Kunio; Siitari-Kauppi, Marja; Eichinger, Florian; Leuenberger, Markus
Contributor: University of Helsinki, Department of Chemistry
Date: 2021-10
Language: eng
Number of pages: 17
Belongs to series: Minerals
ISSN: 2075-163X
URI: http://hdl.handle.net/10138/336483
Abstract: The porosity and pore geometry of rock samples from a coherent granodioritic rock body at the Grimsel Test Site in Switzerland was characterised by different methods using injection techniques. Results from in situ and laboratory techniques are compared by applying innovative in situ resin impregnation techniques as well as rock impregnation and mercury injection under laboratory conditions. In situ resin impregnation of the rock matrix shows an interconnected pore network throughout the rock body, consisting mainly of grain-boundary pores and solution pores in magmatic feldspar, providing an important reservoir for pore water and solutes, accessible by diffusion. Porosity and pore connectivity do not vary as a function of distance to brittle shear zones. In situ porosity was found to be about 0.3 vol.%, which is about half the porosity value that was determined based on rock samples in the laboratory. Samples that were dried and impregnated in the laboratory were affected by artefacts created since core recovery, and thus showed higher porosity values than samples impregnated under in situ conditions. The extrapolation of laboratory measurements to in situ conditions requires great care and may not be feasible in all cases.
Subject: crystalline rock
matrix porosity
connected porosity
in situ experiment
laboratory porosity determination
CONNECTED POROSITY
MATRIX DIFFUSION
POREWATER
TRANSPORT
PROFILES
116 Chemical sciences
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