6533b86dfe1ef96bd12c9584
RESEARCH PRODUCT
Characterization of spatial porosity and mineral distribution of crystalline rock using X-ray micro computed tomography, C-14-PMMA autoradiography and scanning electron microscopy
Arttu MiettinenArttu MiettinenJuuso SammaljärviPaul SardiniMikko VoutilainenBjörn GyllingJoni ParkkonenMarja Siitari-kauppiLasse KoskinenJan-olof SelroosMaarit Yli-kailasubject
crystalline rocksScanning electron microscopeFracture (mineralogy)pore structure116 Chemical sciences010501 environmental sciences010502 geochemistry & geophysics01 natural scienceshuokoisuusmineraalittietokonetomografiaSCALEX-ray micro computed tomographyMineralcrystalline rockResolution (electron density)PollutionheterogeenisuusCharacterization (materials science)INTERFACEMICROTOMOGRAPHYPore structurePorosityScanning electron microscopyscanning electron microscopyCrystalline rock1171 GeosciencesMaterials scienceC-14-PMMA autoradiographyEnergy-dispersive X-ray spectroscopyMineralogyelektronimikroskopiaSpatial distributionFRACTURESGeochemistry and Petrologyenergy dispersive X-ray spectroscopyEnvironmental ChemistryOLKILUOTOPorosityIMPREGNATIONSIMULATION APPROACHkivi0105 earth and related environmental sciencesEnergy dispersive X-ray spectroscopyta114röntgentutkimusDIFFUSION EXPERIMENTRESOLUTIONHeterogeneityCrystalline rocksCONNECTED POROSITYdescription
The spatial porosity and mineral distribution of geological materials strongly affects transport processes in them. X-ray micro computed tomography (X-mu CT) has proven to be a powerful tool for characterizing the spatial mineral distribution of geological samples in 3-D. However, limitations in resolution prevent an accurate characterization of pore space especially for tight crystalline rock samples and 2-D methods such as C-14-polymethylmethacrylate (C-14-PMMA) autoradiography and scanning electron microscopy (SEM) are needed. The spatial porosity and mineral distributions of tight crystalline rock samples from Aspo, Sweden, and Olkiluoto, Finland, were studied here. The X-mu CT were used to characterize the spatial distribution of the main minerals in 3-D. Total porosities, fracture porosities, fracture densities and porosity distributions of the samples were determined using the C-14-PMMA autoradiography and characterization of mineral-specific porosities were assisted using chemical staining of rock surfaces. SEM and energy dispersive X-ray spectroscopy (EDS) were used to determine pore apertures and identify the minerals. It was shown that combination of the different imaging techniques creates a powerful tool for the structural characterization of crystalline rock samples. The combination of the results from different methods allowed the construction of spatial porosity, mineral and mineral grain distributions of the samples in 3-D. These spatial distributions enable reactive transport modeling using a more realistic representation of the heterogeneous structure of samples. Furthermore, the realism of the spatial distributions were increased by determinig the densities and porosities of fractures and by the virtual construction heterogeneous mineral distributions of minerals that cannot be separated by X-mu CT. Peer reviewed
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-02-01 |