In Pakistan the first oil well was drilled near an oil seep at Kundal in the Potwar basin in 1866, just 7 years after the Drake well in Pennsylvania. Since then in spite of a low number of wells drilled, several oilfields have been discovered. Yet the Potwar basin still has not acquired the status of a mature basin as all of its potential reservoirs either have not been reached or tested. Main production has been from Paleogene carbonate and Jurassic clastic reservoirs. The oldest reservoirs of Cambrian and Permian ages have been found in the thrusted anticlinal play of Adhi, Joya Mair, Dhurnal, Balkassar, Chak Naurang, Missa-Keswal, Rajian, and Kal oil fields. The recent commercial oil discovery in Permian Tobra sandstone in Missa Keswal-2 well by Oil & Gas Development Corp. Ltd. stresses the need for more concentrated effort on these older reservoirs, which either have not been reached or missed production tests in the first holes, as in Missa Keswal-1.