Applying gamma-ray logs to a carbonate reservoir: A Pakistan Potwar basin example

The article focuses on the identification of certain segments reflecting geologically meaningful zones based on single and most commonly available gamma-ray log in water as well as hydrocarbon exploratory wells through cross-plotting shale volume against depth using simple and established mathematical relationship presented by Dresser Atlas. The basin comprises 533,500 sq km and contains more than 15,000 m of sediments, ranging in age from Precambrian to recent, and is deformed by Indian and Eurasian plate collision. The basin is comprised of buried ridges, platform slope, and a zone of upwarp and downwarp. The Indus basin elements are broadly classified as, in the Upper Indus basin, the Kohat and Potwar subbasins, and in the Lower Indus basin, the central and southern subbasins.