2D Seismic Interpretation of Qazian Area, Potwar Plateau Pakistan (P-1103) (MFN 3909)

Abstract

This dissertation contains the study of 2D seismic reflection data interpretation of selected seismic lines (Qzn-04, Qzn-06, Qzn-07 and Qzn-08) of Qazian later named as Missa Kiswal, Northern Indus Basin, Pakistan, for delineation of subsurface structures favorable for hydrocarbon accumulation. Qazian is situated in the Gujar Khan Tehsil. Gujar Khan, is one of the seven Tehsils (sub-divisions) of Rawalpindi District in the Punjab province of Pakistan. The data comprised four seismic lines, base map, and well tops of well Qazian X- 01. Four prominent reflectors (orange, yellow, red and brown) were marked on the basis of their reflection, which represent Murree, Chorgali, Sakesar and Dandot-tobra Formation respectively. Reflectors were identified with the help of well top data, after conversion of time to depth with the help of average velocity. Two-way time (TWT) from the seismic sections and average velocities were used to create TWT and Depth Contour maps. In the end, by the examination of the maps and surface models, more study of the area is suggested. Pop-up anticline structure was observed from the time and depth surfaces of all four Formations. Chorgali Formation is of Early Eocene age and lithologically consists of shale and limestone, Sakesar Formation is of Early Eocene and lithologically consists of nodular limestone with chert in upper part and subordinate marl, while Dandot-Tobra Formation is of Early Permian age and lithologically consists of sandstone. The up thrown side has already been drilled, but more study should be made on the down thrown side.