MID Plot (Mineral Identification Plot).
The use of several Charts is then necessary.
We start with the density - neutron.
The readings of the logs give us a point.
From this point while following the parallel lines until a null porosity,
we will obtain a 
ma
apparent for the matrix. In the same way we use the chart neutron-sonic,
which will give us a 
tma
apparent for the matrix.
We use the Chart MID plot where are represented the points corresponding
to a simple matrix. And we can thus determine the composition of the matrix.
tf
= 189 
s/ft
(for water), f
= 1.0 g/cc (for water), 
nf
= 1, n =The porosity of neutron limestone calibrated.
This figure represents the MID plot of formations
.
Cross-plot between the porosity read on a neutron Limestone calibrated
and the density when the drilling fluid is fresh mud.
 |
Download Chart 12 |
The
MID plot makes it possible to compare the values of matrix density
and tma
of the matrix.
| |
Download Chart 11 |