Abstract:
The study area Shakardara is situated in District Kohat, Khyber Pakhtunkhwa
province, Pakistan. The purpose of the present work is to understand the petrophysical
properties of the wells drilled and structural features of Shakardara area. The data used for
this research work are seismic data of three dip lines 967-SHD-318, 967-SHD-319, 865-
NK-12 oriented N-S direction and one strike line 967-SHD-308 oriented NE-SW direction
in SEG Y format for structural interpretation and well logs data of Chanda Deep-01 well
and Chanda-01 well were used for the petrophysical analysis. The seismic data and well
logs data were processed and acquired by (OGDCL), Oil and Gas Development Company
Limited. Petrophysical analysis is carried out with the help of (GEOGRAPHIX
DISCOVERY) software while (IHS KINGDOM) software is used for seismic
interpretation. The two formations of Chanda Deep-01 namely Lockhart Formation, Datta
Formation, while Hangu Formation from Chanda-01 well is petrophysically interpreted.
The average Vshl (volume of shale) in zone-A of Lockhart Formation is 14.36% and the
effective porosity is 10.66% while the average water saturation Swa is 6.16% and
hydrocarbon saturation is 93.84%. The average Vshl in zone-B of Lockhart Limestone is
13.02% and hydrocarbon saturation is 96.69%. The Vshl (volume of shale) in zone-C of
Lockhart Formation is 8.61% and hydrocarbon saturation is 96.58%.The average volume of
shale in zone-D of Datta formation is 5.03% while in zone-E average Vshl is 20.96% and
hydrocarbon saturation is 57.47% whereas the average hydrocarbon saturation in zone-D is
54.57%.The effective porosity in zone-D is 6.40% while in zone-E phiE (effective porosity)
is 5.41%.Both Lockhart Limestone and Datta Sandstone shows high net pay saturation and
hence considered as an excellent producing reservoir in the area. The average Vshl (volume
of shale) in zone A of Hangu Formation of Chanda-01 well ranges upto 7.70% while the
effective porosity is 5.18% and the hydrocarbon saturation is 88.58% acts as a good to
better producing reservoir in the well. For the seismic interpretation three reflectors and
thrust faults are marked on seismic time section. The seismic interpretation confirms that
thrust fault propagation fold is present in the area which leads to compressional tectonic
regime. Seismic section shows that structural traps are present in the area which is best for
the accumulation of hydrocarbon. Both time and depth contour maps are generated which
shows thrusted anticlinal structure. Seismic interpretation confirms that both wells are
drilled on thrust anticlinal structure.
