2D SEISMIC INTERPRETATION AND PETROPHYSICAL ANAYLSIS OF QADIRPUR AREA, CENTRAL INDUS BASIN, PAKISTAN

Abstract

This dissertation's major goal is to assess the hydrocarbon potential in the Qadirpur Gas field. Geographically, Qadirpur field is located at a distance of 8 km from Ghotki in Sindh Province and well Qadirpur-03 is located at 28° 05" 15.10' N and 69°20"40.28' E. Tectonically, this gas field lies at the South Eastern boundary of Sulaiman foredeep in Central Indus basin. Sulaiman sub-basin contains 14 gas and condensate fields with proven reservoirs of Eocene carbonates. Habib Rahi limestone of Kirthar Formation (middle to late Eocene) and Sui Upper limestone (lower Eocene) are the proven reservoirs of Qadirpur well-03 which is producing 526 MMscf gas per day. Seismic and well data has been utilized to delineate the reservoir potential of targeted formations. Structure analysis has been performed using 5 2d seismic lines and the horizons were confirmed via synthetic seismogram. Horst and Grabben geometry was delineated in the subsurface through seismic interpretation and the same structural behavior have been depicted by the time and depth mapping. Petrophysical analysis was performed on the well-03 to quantify the physical parameters of the two reservoirs in order to assess their potential. Four zones were established, two at the level of Sui Upper Limestone and two at the Habib Rahi Limestone level. Zone Sui Upper limestone, which spans 1222-1225 metres, stands out as a prospective zone with a good effective porosity of 23.22% because of the presence of vuggs. Despite having a lower overall thickness than other zones, this zone has a high hydrocarbon saturation of 72.2%, which is advantageous.