Abstract:
The present study pertains to the modeling of the productive zones from seismic and well log data. This was carried out by using seismic lines, 805-SK-20, 805-SK-18 and 795-SK-05R, and well log data of Dhodak-05 provided by the Directorate General of Petroleum Concession. The area is important for its hydrocarbon (gas & oil) structural traps. The Dhodak Gas Oil Condensate field was acquired by OGDCL. The area lies in the Middle Indus basin and the reservoir encountered during the study of well Dhodak-05 is Pab Sandstone Formation.
During the study of seismic sections, first of all I pick the prominent horizons on the seismic sections on the basis of Synthetic Seismogram. In the interpretation, four reflectors were marked and named as Dungan Formation, Pab Sandstone Formation, Mughal Kot Formation and Chiltan Formation respectively. Then time of each reflector was noted against each shotpoint. Moreover I have prepared time, depth and velocity contour maps of Pab Sandstone on the base map. Formula used for the conversion of time into depth is given below:
S = V*T/2
In Petrophysical studies, first of all I determine the Reservoir parameters that are Volume of Shale, Porosity (Density* NPHI or Sonic), Resistivity of Water, Water Saturation and Hydrocarbon Saturation. During petrophysical interpretation different cross plots were constructed like porosity, volume of shale, Hydrocarbon saturation, Water Saturation against depth interval which shows the behavior of the reservoir.
