Premium
The Permeability of Columnar Jointed Lava
Author(s) -
Vasseur Jérémie,
Wadsworth Fabian B.
Publication year - 2019
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1029/2019jb018118
Subject(s) - lava , permeability (electromagnetism) , geology , scaling , lattice boltzmann methods , porosity , fluid dynamics , geothermal gradient , mechanics , crust , petrology , materials science , geotechnical engineering , volcano , geometry , geophysics , physics , mathematics , membrane , biology , genetics , seismology
Columnar jointed lava is an important facies in many geothermal reservoir systems. The permeability of jointed lavas is dominated by the contribution from fracture networks. We use a scaling for the permeability of a set of fractures in a solid or porous mass and extend this to arrays of hexagonal intercolumn fractures. To validate our analytical results, we create numerical domains with relevant geometries and extract system‐scale permeability using the LBflow lattice‐Boltzmann fluid flow simulation tool. Finally, we model the cooling contraction of columns to extend our results so that they predict the permeability with time after lava emplacement. Importantly, we use these results to estimate the range of permeabilities typical of columnar joints that form during cooling from high temperature and are preserved in the crust at moderate to low temperatures.