A study is conducted to investigate the rock physics properties of volcanic
facies from available core measurements from Iceland and Hawaii. The main
goal is to investigate the rock physics properties of a set of volcanic rock
samples, and to establish predictive rock physics templates for these rocks, as
a function of facies and rock texture, fluids and minerology. We focus on lava
flows and hyaloclastites from Iceland and Hawaii. We find that both these
facies can be modelled using modified Hashin-Shtrikman upper elastic bounds,
and we create rock-physics templates for varying porosity and fluid saturations.
Dry or gas-filled hyaloclastite facies plots with low acoustic impedances and
low Vp/Vs ratios and are nicely separated from brine-filled hyaloclastites. Dry
and wet high-porosity/high-permeability vesicular lavas will have similar AI and
Vp/Vs values, and therefore these rocks will be more difficult to discriminate
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