Abstract:
Fimkassar is situated in Punjab, Pakistan. It is 517 m above sea level in terms of
elevation. The area is a part of Chakwal district and lies at a distance of 72 km south of
Islamabad in Potwar sub-basin region of the Upper Indus basin.
Five Migrated seismic lines were assigned of Fimkassar area and well logs of well
Turkwal Deep 1 of the Potwar foreland basin. This data was given to us for seismic
interpretation and petrophysical evaluation of that area respectively. All data was taken
from DGPC, Islamabad, Pakistan. Seismic lines 884-FMK-102 and 884-FMK-107, and
seismic lines 884-FMK-104 and 884-FMK- 106 are oriented NW to SE and SE to NW
respectively. While, 884-FMK-103 is oriented S-N. the subsurface structural interpretation
of the area was done on the basis of velocity data obtained which further helped in the
conversion of time into depth sections.
Two reflectors were marked with Chorgali Formation (Top Eocene), and the
Sakesar Limestone. Thrust faults were marked, and then time contour maps were
generated. Time sections were converted into depth sections with the help of average
velocity and finally depth contour maps were generated. The major causes have been the
thrust faults that evoked from the basement salt movement to form anticlines. Hydrocarbon
traps were most possibly developed in these anticlines and are the prospective zones for
hydrocarbon accumulation in the Fimkassar area.
Petrophysical evaluation of well Turkwal Deep-1 was carried out to highlight the
reservoir area which included the selection of zone of interest followed by Log
interpretation. The volume of shale, porosity, permeability, saturation of water, and
hydrocarbon saturation was interpreted. On the basis of petrophysical evaluation it was
noted that the reservoir of Eocene (Chorgali Formation and Sakesar Limestone) bore good
porosity but was lacking hydrocarbon potential. These conditions made the well
uneconomical and was abandoned.
