Reservoir Potential Evaluation of Lower Goru Formation in Zaur Field, Southern Indus Basin, Pakistan

Abstract

The well Zaur-1 and Zaur-3 were drilled to evaluate an exploration prospect in Zaur field. The petrophysical analysis was performed to determine the petrophysical properties, Intervals of hydrocarbon potential along with the accessing the thickness of the intervals and porosity of formations. A significant reservoir discovery has been made in Lower Goru Formation. A conventional suite of Wireline logs including Gamma Ray, SP, LLS, LLD, MSFL, Density and Neutron were acquired for formation evaluation purposes. The Petrophysical analysis has been done on Geo Graphics, Gverse. The Lower Goru Formation of Zaur 1 started from 1766.93 having thickness of 214m and in Zaur 3 started from 1894.64 having a thickness of 236m. The Lower Goru Formation of Zaur 1 has four Sand Zones in it as A Sand (1766.93-1803.2), B Sand (1816-1844), C Sand (1895-1973), and D Sand ( 1973-1981).The average calculated parameters that’s volume of shale is 15, 7, 58 and 72 %, Average porosity is 4, 10, 11, 12 %, effective porosity is 3, 9 ,4 ,9 % and saturation of Hydrocarbon is about 2, 80 ,35, 12 percent. The Zaur 3 well also exhibits four Sand Zones in it as A Sand (1894-1926), B Sand (1937-1975), C Sand (2015-2101), and D Sand ( 2010- 2050) having volume of shale 10, 9,43,44 %, Average porosity 8, 11,13,13 %, Effective porosity 7,10, 7, 7 % and Saturation of Hydrocarbon is 20,52, 37 ,33 % in it. The analysis indicates that B Sand of Zaur 1 has highest hydrocarbon saturation compared to B Sand and in Zaur 3.