2D Seismic Interpretation of Meyal Area (T-1465) (MFN 5644)

Abstract

Meyal oil field is one of the major oil and gas producing fields in the Potwar plateau upper Indus basin, northern Punjab, Pakistan. The field was discovered by Pakistan Oilfields Limited POL in 1968 after the seismic data acquisition. The field has produced 16 wells and has produced over 36 MMBL oil and 250 BCF gas from fractured Paleocene and Eocene shallow marine shelf carbonate deposits of the Lockhart- Ranikot and Chorgali-Sakesar formation. Most of the wells drilled in the central part of the Eocene structure. The Himalayan Collision system represents an active collision orogen between Indian and Eurasian subcontinents. The collision is active since about 55 Ma involves continuous uplifting, erosion and deposition of the sediments. Data for the 2D seismic interpretation involves five seismic lines, three dip lines and two strike lines were provided including Base map of the given seismic lines. For the interpretation of seismic data three reflectors R1, R2, R3, have been marked depending on prominent wiggles and named as, Chorgali formation, Nammal formation and basement on the basis of given seismic lines. Faults were also marked to examine the subsurface structure. A pop-up structure can be seen in the marked seismic section. Time section is converted into the depth section to view the real picture of the interpreted horizons. Time and depth contour maps of Chorgali and Nammal formations are also prepared at a particular level to analyze the variations on the basis of time and depth and for the identification of structures. For calculation of average velocities, TWT is picked from the horizon and the RMS velocity which is given above the seismic section in windows. The respective travel time to their respective RMS is interpolated and then we obtain TWT and its respective distance on excel sheet. The average velocity is calculated by taking the average of respective RMS velocities and depth is obtained by multiplying the average velocity with TWT.