Valgarður: A Database of the Petrophysical, Mineralogical, and Chemical Properties of Icelandic Rocks

Abstract

Abstract. The Valgarður database is a compilation of data describing the physical and geochemical properties of Icelandic rocks. The dataset comprises 1072 samples obtained from fossil and active geothermal systems, as well as relatively fresh volcanic rocks erupted in sub-aerial or sub-aqueous environments. The database includes petrophysical properties (effective and total porosity, grain density, permeability, electrical resistivity, acoustic velocities), as well as mineralogical and geochemical data obtained by point-counting, X-ray Fluorescence (XRF), quantitative X-ray Diffraction (XRD), and Cation Exchange Capacity (CEC) analyses. The motivation behind this database is threefold: (i) aid in the interpretation of geophysical data including uncertainty estimations, (ii) facilitate the parameterization of numerical reservoir models, and (iii) improve our understanding of the relationship between rock type, hydrothermal alteration and petrophysical properties.

Valgarður: a database of the petrophysical, mineralogical, and chemical properties of Icelandic rocks

“…This highlights the challenges of ensuring the accessibility of such "legacy" data. As future studies address these gaps in the database, we anticipate future releases of the database using the versioning system available on Zenodo, and these updates will be made available at the same repository address given in this publication (Scott et al, 2022a). Despite the gaps in the data, we believe that the present release of the Valgarður database will enhance the accessibility of the existing data and constitutes a valuable resource for future studies investigating the interplay between the physical and chemical evolution of rocks.…”

“…The database is archived on Zenodo at https://doi.org/10.5281/zenodo.6980231 (Scott et al, 2022a) and is available under the Creative Commons Attribution 4.0 International license. This repository includes the main Excel file containing the two main worksheets: one listing sample metadata and petrophysical properties and the other listing geochemical and petrographic data.…”

“…In recent years, a growing number of databases providing detailed petrophys-ical (Bär et al, 2020;Weinert et al, 2021;Weydt et al, 2021;Heap and Violay, 2021) and geochemical (Gard et al, 2019;Cole et al, 2022;Harðardóttir et al, 2022) data have been published. Such data can be used to build an understanding of volcanic eruption risks (Heap et al, 2015(Heap et al, , 2022b, geothermal resources (Siratovich et al, 2014;Heap et al, 2017bHeap et al, , 2020aScott et al, 2022a), surface deformation (Heap et al, 2020b), silicate weathering (Cole et al, 2022), and seismicity (Heap et al, 2015(Heap et al, , 2022bMeller and Ledésert, 2017;Heap and Violay, 2021).…”

“…The database includes petrophysical properties (connected and total porosity, grain density, permeability, electrical resistivity, acoustic velocities, rock strength, and thermal conductivity) as well as mineralogical and geochemical data obtained by point counting, X-ray fluorescence (XRF), quantitative X-ray diffraction (XRD), and cation exchange capacity (CEC) analyses. The database may be accessed at https://doi.org/10.5281/zenodo.6980231 (Scott et al, 2022a). We present the database and use it to characterize the relationship between lithology, alteration, and petrophysical properties.…”