The Petrophysical Properties and Reservoir Units Of The Mishrif Formation in Shuaiba Dome in the Zubair Oil Field in Southern Iraq
Abstract
In this work, the petrophysical properties were estimated using the open-hole logs for the study area wells, namely (Zb-245, Zb-199 and Zb-257) in the Shuaiba dome of the Zubair Formation oilfield. The estimated petrophysical properties include the volume of shale (VSH), total porosity, effective porosity, primary and secondary porosity, the resistivity of the formation water (Rw), the water and hydrocarbon saturation, the movable and residual water saturation to the invaded and uninvaded zones, and the movable and residual hydrocarbon saturation to the invaded and uninvaded zones. Based on the estimated petrophysical properties and the behavior of the open-hole log, Mishrif Formation in the Zubair oilfield was divided into three main reservoir units using the Geolog software 2020. The main reservoir units are mA, mB1 and mB2 which are subdivided into subunits based on their petrophysical properties. The results showed that the primary porosity is the main porosity. The secondary porosity does not affect the performance of the reservoir units. The water and hydrocarbon saturation varied between the mA and mB1 units, whereas the mB2 unit showed high water saturation.
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