Reservoir Properties Identification using Rock Physics Modelling and Petrophysical Analysis of Gulyana Area, Upper Indus Basin, Pakistan (P-1185) (MFN 5792)

Abstract

This dissertation comprises the study of 2D seismic reflection for the demarcation of subsurface structures for the hydrocarbon accumulation in Gulyana area, Upper Indus Basin, Pakistan. The provided data comprised of five seismic lines. Four conspicuous reflectors representing Sakesar, Chorgali, Dandot and Khewra formations were marked on basis of their reflections. The interpreted structure was NESW trending pop-up anticline bounded with two NW dipping major thrust faults and one minor SE trending back thrust. Time, velocity and depth contour maps confirm the presence of pop-up structure and bounding thrust faults. Petrophysical interpretation for Qazian X-01 indicated a prospective zone in Sakesar Limestone which is mainly water wet with the average water saturation of about 81.7%. The rock physics modelling has reassured the presence of hydrocarbons in the Gulyana area. The new wellsite is also suggested on the line 994-GNA-14 because of abrupt decrease in Vp/Vs, Poisson’s ratio and density as compared to line 994-GNA-09 on which the Qazian X- 01 was drilled. The volumetric estimates for the Sakesar Limestone done on the basis of Petrophysics and seismic interpretation suggest that there is about 9.84 million barrels of oil at reservoir conditions.