Abstract:
For the exploration of hydrocarbons, petrophysical analysis has been done in Joya Mair-04 well in Upper Indus Basin Pakistan. In Joya Mair-04 drilling has been done from Murree Formation of Miocene age up to Salt Range Formation of Cambrian age. Logging suits including caliper log, spontaneous potential log, gamma ray log, dual laterolog, microspherically focused log, neutron log, density log and sonic log. The methodology adopted to achieve the goal includes; Quality check of the data set, correlation of curves of different logs to demarcate the possible reservoir zone, measurement and computation of volume of shale using gamma ray log, porosity measurement by porosity logs i.e sonic log, resistivity of water, saturation of water and saturation of hydrocarbon. Two reservoir zones are marked in Sakesar Formation and one zone is from Khewra Sandstone. Zone 1 thickness feet 6656 ft to 6672 ft and zone 2 in Sakesar Formation having thickness is 6684 ft to 6706 ft while one zone is from Khewra Sandstone having thickness is 8230 ft to 8250 ft been marked on the basis of certain petrophysical parameters i.e. low GR log values, high LLd values and neutron-density crossover. Marked zone have low volume shale, low effective porosity and high hydrocarbon saturation that is why Sakessar Formation is showing high hydrocarbon potential but Khewra Sandstone show low Hydrocarbon potential because of low Hydrocarbon saturation.
