3D Petrophysical Modeling of Mauddud Formation at Ratawi Oil Field, Southern Iraq

Abstract

3D Petrophysical model for Mauddud Formation in Ratawi oilfield had been created. Five wells have been chosen in Basra governorate to construct Structural and petrophysical (effective porosity, water saturation and Net /Gross) models. Structural model showed that Ratawi oilfield composed of one anticline fold, where its axis extends toward North to South. After creating zones for Mauddud Formation, which was divided into 5 zones i.e. A, B, C, D and E zone. Layers were built for each zone according to petrophysical properties. A, B and D units were divided in 1 layers as a barrier, While the unit B was divided into 25 layers and the unit D was divided into 15 layers because it represents reservoir zones. The 3D grid of Mauddud Formation model that was built consists of (841295) cell and each cell have dimensions I =91 * J =215 * K =43. Finally, Petrophysical models (effective porosity, water saturation and Net /Gross) had been constructed for each zone of Mauddud Formation. Based on data analyses and results from modelling, the B then D is a important reservoir unit in terms of its good properties (high effective porosity, low water saturation) and increase in production periods from the thickness of the total reservoir.