Evaluating the reservoir properties of Nahr Umr Formation at Luhais oil field, southern Iraq using well logs data

Abstract

Nahr Umr formation in the oilfield of Luhais in southern Iraq is one of productive clastic reservoirs which formed during the secondary Alpine cycle. To cover the objectives of this study, twenty two wells were selected to evaluate the reservoir characteristics of  the Nahr Umr formation in Luhais oilfield in southern Iraq. The petrophysical characteristics (Shale Volume (Vsh), Bulk volume hydrocarbon (BVH), Hydrocarbon saturation (Sh),  Water saturation (Sw), thickness, Bulk water volume (BVW), porosity (φ ) were calculated and interpreted using the Geolog software. The Nahr Umr Formation was divided into three main reservoir units based on their petrophysical properties, these units are: Upper Nahr Umr reservoir unit, Middle Nahr Umr reservoir unit and Lower Nahr Umr reservoir unit. It was found that the best reservoir units in terms of hydrocarbon saturation and production are the middle Nahr Umr reservoir unit.