2D Seismic Data Interpretation and Petrophysical Analysis of Meyal Block, Potwar Basin, Pakistan (T-1457) (MFN 2245)

Abstract

The study area (Meyal) is bounded by latitudes and longitudes l8i E and is a part of the Meyal block which lies in the northern part of Potwar sub-basin i.e. North Potwar Deformed Zone (NPDZ). The seismic lines (a total of 8), seismic map and well data (MEYAL-05), Vertical Seismic Profile (VSP) data of well (MEYAL-08) and Sonic, Gamma and resistivity log of Wclls(lO, 17) arc obtained from Landmark Resources (LMKR) with the prior approval from the Directorate General of Petroleum Concession (DGPC). Identify key scismic reflections using well data and Vertical Seismic Profile(VSP).These rcIlcctors are Rl (Kohat),R2 (Datta),R3 (Chorgali). Construction of Time, Velocity and Depth contour maps. Construction or Geoscismic 1 Depth section, restored section and calculation of crustal shortening of Seismic lines. The velocity graphs show that the velocity falls in the range between 2000m/sec to 5000m/sec along this structure. The maximum depth of basement is 7800m. CaJculaion of total and recoverable reserves and different parameters of reservoirs by utilizing well logs. In Meyal block Kohat, Chorgali, Sakes:!r and Datta Formations arc major producing reservoirs. The gray shales of the Mianwali (Triassic agc), Datta (Jurassaic age) and Patala Fornntions (Paleoccne age) are potential source rocks in study area (MeyaJ). Mianwali formation include 27% to 36% total organic content (TOC) in isolated pockets of shales. The Kuldana Formation (Eocene age) and Murree formation both acts as cap lor the resl.:rvoI r. Thl.: time, velocity, depth contour maps and of the respective surfaces of Rl, R2 and R3 (probabk top Eocene Kohat, Chorgali and Datta formation) shows that the subsurfacc structure is a faulted anticline. Thrust faults are NW-SE trending. The axis of the antieiine is in the East-West direction and the faulted anticline plunges in both East and West directions. The depth section for the lines also shows that i.e. North dipping thrusts and South dipping back thrusts.