Reservoir Characterization of Sand Intervals of Lower Goru Formation Using Petrophysical Studies; A Case Study of Zaur-03 Well, Badin Block, Pakistan

Abstract

Present study deals with petrophysical interpretation of Zaur-03 well for reservoir characterization of sand intervals of Lower Goru Formation in Badin Block, Southern Indus Basin, Pakistan. Early Cretaceous Lower Goru Formation is the distinct reservoir that is producing hydrocarbons for two decades. Complete suite of wireline logs including GR log, Caliper log, SP log, Resistivity logs (MSFL, LLS, LLD), Neutron log and Density log along with well tops and complete drilling parameters were analyzed in this study. The prime objective of this study was to mark zones of interest that could act as reservoir and to evaluate reservoir properties including shale volume (V_sh), porosity (ϕ), water saturation (S_w), hydrocarbon saturation (S_h) and net pay thickness. Based on Petrophysical evaluation three zones have been marked in Lower Goru Formation, A Sand (1890m to 1930m), B-sand (1935m to 2010) and C-sand (2015m to 2100m). The average calculated parameters for evaluation of reservoir properties of Zaur-03 well depicts an average porosity of 8.92% and effective porosity of 4.81%. Water Saturation is calculated as 28.54% and Hydrocarbons Saturation is 71.46%. Analysis shows that S_h in Zaur-03 well is high so the production of hydrocarbons is economically feasible.