PETROPHYSICAL PROPERTIES IN LIMESTONES AT GUNUNG KANTAN SUNGAI SIPUT, PERAK, MALAYSIA

Determination of the petrophysical properties in carbonate reservoirs takes high
priority as accurate measurements of the petrophysical properties allow the simulation
of the flow of the reservoir. The objective of this project is to determine the
petrophysical properties of limestone formation in Gunung Kantan, Sungai Siput,
Perak. The petrophysical properties that are involved with the projects are porosity,
permeability, sonic velocity, determination of the crystal type and determination of
the type of rock. The experimentation of the rock sample begins with collection of the
rock sample at Gunung Kantan, Sungai Siput, Perak. A total of 11 samples are taken
from 3 different sites around Gunung Kantan.
The first experiment is the determination of the porosity and permeability of rock
samples. The experiment is done using the mercury porosimeter as the normal
poroperm machine could not detect the amount of porosity and permeability that exist
within the rock samples. The result of the experiment is that the rock samples contain
a small amount of porosity (max. 6 %) and small amount of permeability (max. 0.14
mD).
The second experiment is the determination of the type of the rock. In this experiment
author prepares several thin section from the rock samples and determine the rock
type by microscopic sketch approved by the lab assistant. The rock samples were
found to be from packstone type which contains grain-supported structure within the
presence of mud. The determination of type of rock also involves an experiment with
the X-Ray Diffraction. The experiment uses powder from the rock samples and the
result from the experiment is that the rock samples are limestone with the presence of
a small amount of magnesium.
The third experiment is the determination of the grain shape. In the experiment,
author prepares several samples for Scanning Electron Microscope. The experiment
objective is to find the type of crystal that exists within the rock samples. The result of
the experiment is there are two types of crystal that exists within the rock samples
which is compact anhedral crystal and micro rhombic polyhedral crystal.