Abstract
Two laboratory petrophysical measurements techniques including the multi-sensor core
logging (MSCL) and thermal conductivity scanning (TCS) methods were integrated in order
to determine petrophysical properties and their spatial variations in a laboratory experiment.
The objective was to investigate how the two techniques vary in the determination of the
petrophysical properties and study their spatial variation. Two core samples (BS; sandstone
and B6; metamorphic conglomerate), each cut in half, one fully saturated and one fully dried
were used. Sensor-based devices of the MSCL equipment were used to determine the density,
P-wave velocity, magnetic susceptibility and porosity, while the TCS technique estimated
thermal conductivity and porosity. Results based on the MSCL for the BS shows change in the
bulk density due to porosity and homogeneous factor, while B6 keeps constant bulk density.
P-wave velocity in the BS dry sample shows higher velocity than the saturated sample, while
in the B6 sample velocity curves depict irregular trend. Magnetic susceptibility for the BS
sample shows zero magnetism, while for the B6 sample, curves indicate it is magnetic. The
porosity values in the BS sandstone shows realistic and expected values from about 7 % to 11
%, confirming very homogeneous sandstone, while B6 sample has close to zero porosity,
expected in hard rock specimen. Thermal conductivity for the BS sample shows very straight
curves, confirming homogeneous sandstone. For the B6 sample, there is deviation, showing
the effects of the rock inhomogeneity. Thus, MSCL and TCS laboratory techniques are
reliable in the estimation of petrophysical properties and evaluation of their spatial
variations.