Geological model Construction for Yamama Formation at Faihaa Oil Field- South of Iraq

Abstract

A construction of a 3D geological model of  Yamama Formation to explain the distribution of petrophysical properties (shale volume, effective porosity and hydrocarbon saturation) by using Petrel software. Five wells were selected in order to build structural and petrophysical models based on the interpretation of well logs and petrophysical properties. Yamama reservoir is divided into four main units (YA, YB, YC, and YD), YA is divided into five secondary reservoir units (YA1, YA2, YA3, YA4, and YA5), YB is divided into two secondary reservoir units (YB1 and YB2), YC is divided into two secondary reservoir units (YC1 and YC2) and YD is divided into three secondary reservoir units (YD1, YD2, and YD3). The structural model showed Faihaa oil field represented by an anticlinal fold with double plunging. Petrophysical models (shale volume, effective porosity and hydrocarbon saturation) were constructed for each subunit of Yamama reservoir using sequential Gaussian simulations executed with Petrel software. According to data analyzes and the results from modelling, the subunits for both YB and YB  are good reservoir units regarding its good petrophysical properties (high effective porosity and high hydrocarbon saturation) and are considered the most important productive units in Yamama Formation.