The pattern of
dissolution lead to reduction in the bulk volume with
pore volume slightly reduced or generally remains in
the pore spaces. The effect on pH is clearly related to the
concentration of Ca2+ ions in the media over time due
to bacteria metabolism or those coming from salinity
alone, however the electrical conductivity shows a weak
correlation with calcium ions release suggesting that
the calcium ions in this media are not completely dissociated. Since modification of rock properties during
microbial process can be positively applicable in increasing the reservoir porosity can expose larger fraction
of the reservoir rock and inducing wettability that can
improve oil recovery due to the type of nutrient chalk
with C. tryobutyrium.