Abstract:
For the hydrocarbon exploration, study has been carried out in Pirkoh located
in Sulaiman fold belt, sub part of central Indus basin Pakistan. Tectonically, Pirkoh
structure is an attractive anticline, located in the northeast of Sulaiman foredeep. In
Pirkoh the drilling has been done from Kirthar Formation of Eocene age up to
Mughalkot Formation of upper Cretaceous age. Logging suite which includes caliper
log, spontaneous potential log, gamma ray log, dual Laterolog, neutron log, density
log, sonic log and micro spherically focused log has been run from depth of 2169 to
2354 m encountering Lower Ranikot Formation of lower Paleocene age, Pab
sandstone and Mughalkot Formation of upper Cretaceous age. One zone of interest
has been marked as Pab Sandstone till the well bottom. According to present research
work, Pab Sandstone has been concluded as reservoir, the zones not only showed
good porosity and hydrocarbon saturation but also bear acceptable volume of shale.
For the study we have been given the segy files, navigation file, the well tops file for
our research. For seismic interpretation, first the files are added to the software and a
base map is generated, then since there is difference between the data types, a tie
needs to be created and for that a synthetic seismogram is generated after which the
horizons are marked and then faults are marked and finally after the horizons have
been marked, a time contour map and depth contour map are plotted for
interpretation. Now for petrophysical analysis, after the logs are added, the zone of
interest is marked which in this case is Pab Sandstone and since is no clear
separation between the resistivity curves, entire thickness of Pab Sandstone is
evaluated for petrophysical analysis. Then volume of shale is calculated and volume
of sand after which the porosities are calculated which are average and effective
porosity respectively. After the results are calculated, it is concluded that
petrophysical analysis confirms Pab Sandstone has good effective porosity and
hydrocarbon saturation. Entire zone in Pab Sandstone has been evaluated for
petrophysical analysis which shows that the sands of Pab Sandstone have the
potential of being a reservoir.
