Evaluating Petrophysical Parameters of A Well GG-21 In Malaysian Region Using Wireline Logging.

This project examines the petrophysical parameter of a Well GG-21 in
Malaysian region using measurement while drilling (MWD) which is a type of
wireline logging. It is an important stage to determine the petrophysical properties of
a well because reservoir characterization and hydrocarbon reserves can be known.
Therefore, evaluating the petrophysical parameters of a well in Malaysian region is
crucial in order to determine whether or not the well is commercially productive. In
this study, logging data studied comprises of gamma ray log, resistivity log, neutron
log and bulk density log. In order to obtain the finalize results, certain steps need to
be carried out. Firstly is the interpretation of Well GG-21, secondly data and
information are gathered in order to calculate the petrophysical parameters using
mathematical method and Geolog Software. Lastly, results from both methods are
then compared and supposedly it will be quite same. For this study, the desired zone
of interest is from Kl reservoir till L3 reservoir. This is because, as the well was
drilled deeper, it soon began to water out. Average porosity and average water
saturation (Sw) has been calculated using both Geolog software and mathematical
method. Based on the results, it can be concluded that it shows quite the same results
for both methods. In order to correctly estimate the porosity using mathematical
method, the correction factor has to be taken into account. Kl reservoir has a
moderate good average porosity of 21.2% and it has gas and oil bearing indication.
As for K2 till Ll and L3 reservoir, the moderate average range from 17-23% and it
has oil-bearing indication. L2 reservoir has clear water bearing sand as shown from
logs and formation pressure data. As for the time being, the well has been suspended
pending further development in the future.