  The geological systems such as petroleum reservoirs is investigated by the
entropy introduced by Tsallis and multiplicative hierarchical cascade model.
When non-Gaussianity appears, it is sign of uncertainty and phase transition,
which could be sign of existence of petroleum reservoirs. Two important
parameters which describe a system at any scale are determined; the
non-Gaussian degree, $q$, announced in entropy and the intermittency,
$\lambda^2$, which explains a critical behavior in the system. There exist some
petrophysical indicators in order to characterize a reservoir, but there is
vacancy to measure scaling information contain in comparison with together,
yet. In this article, we compare the non-Gaussianity in three selected
indicators in various scales. The quantities investigated in this article
includes Gamma emission (GR), sonic transient time (DT) and Neutron porosity
(NPHI). It is observed that GR has a fat tailed PDF at all scales which is a
sign of phase transition in the system which indicates high $q$ and
$\lambda^2$. This results in the availability of valuable information about
this quantity. NPHI displays a scale dependence of PDF which converges to a
Gaussian at large scales. This is a sign of a separated and uncorrelated
porosity at large scales. For the DT series, small $\lambda^2$ and $q$ at all
scales are a hallmark of local correlations in this quantity.
