Generic Approach of Integrating Core Data, and Petrophysical Interpretation to Generate Reliable Facies Model in Absence of Seismic Attribute Analysis- West Qarun Field Case Study

Abstract

Abstract No doubt that facies modelling process is a key process during building the static model which dominates all the petrophysical distribution after that. One of the best way to describe the facies change laterally across the reservoir is seismic attributes interpretation. However; unfortunately seismic attribute doesn't show accurate results in Western Desert in Egypt mostly because the reservoirs thickness is relative small. Several trials on seismic attributes were performed during performing a study on West Qarun field which is located in Abu El-Gharadig basin, Western Desert, Egypt but without reaching conclusive results. West Qarun wells are producing mainly from Middle Abu Rawash “G”, and Lower Abu Rawash “G” reservoirs which their thickness ranges from 30 to 60 ft. This paper presents another approach that was utilized to create facies log for each well integrating the petrophysical interpretation output and the core data as well. After that a thickness map for each facies per each reservoir was created. The resulted maps were utilized for facies model creation and consequently dominated the petrophysical properties distribution: porosity, permeability, and initial water saturation. Permeability-Porosity relationship was described as a function of flow zone indicator (FZI) considering the distributed facies model. Defining FZI range for each facies type yields to more accurate reservoir characterization and prevents usage of unreliable permeability multipliers during history match process. In spite of the absence of seismic attributes conclusive results, the resultant model showed excellent results during dynamic model in terms of production potential of different areas of the reservoir and the connectivity between different wells. The model showed good well by well match, total field match specially the ongoing pilot water injection project and also helped in planning the complete water injection project.