Integrated Carbonate Reservoir Characterization of the Upper Cretaceous Abu Roash 'D' Member Using Lucia Model, NMR, and Core Data

Authors

• Nashwa R. Elsaadany, Petrosannan Company, Egypt.Follow
• Mousa Salah A, Geophysics Department, Faculty of Science, Ain Sham University, Egypt
• Alrawy Azza M, Geophysics Department, Faculty of Science, Ain Sham University, Egypt
• Mostafa Oraby, Petroleum Engineering Department, Faculty of Engineering American University in Cairo.
• Farahat Mohamed I, Transglob company

Article Type

Research Paper

Highlights

Approved

Abstract

This study aims to compute the petrophysical parameters (permeability and water saturation) of Abu-Roash "D" reservoir in East Alam Alshawiesh 6 (AES-E6) field Abu- ElGharadig basin Western-Desert using the equation modified by Lucia (1983). The primary objective is to determine the optimal constant values for the Lucia equation, specifically tailored for the upper Cretaceous carbonate Abu-Roash "D" reservoir. The Lucia model provides a classification of carbonate porosity based on rock fabric and pore size distribution. This classification encompasses interparticle porosity and vuggy porosity, with a recognition that pore size distribution greatly influences permeability and fluid saturation, which, in turn, is influenced by the rock fabric. Consequently, it is imperative to identify and characterize the pore space in carbonate reservoirs by categorizing them into three distinct porosity classes, each exhibiting unique pore-size distributions and interconnectivity. Nuclear Magnetic Resonance NMR analyses, petrography, (X.Ray Diffraction) XRD, (Scanning Electronic Microscope) SEM, capillary pressure and core data analyses were integrated for wells 2X and 3X to have a clear understanding of Abu-Roash "D" reservoir. According to the Dunham carbonate classification scheme, the analyzed carbonate samples can be classified as Packstone and Wackestone, exhibiting average porosity values ranging from 8% to 13%. The T2 distribution of the recorded (Nuclear Magnetic Resonance) NMR for Abu-Roash "D" reservoir in the studied wells confirms the same carbonate classification as Packstone and Wackestone. Based on the Lucia model, Abu-Roash "D" reservoir interval is divided into two parts: the upper part corresponds to class (2), while the lower part aligns with class (3). After several iterations, the constants in the equation for each class were modified to calculate permeability and water saturation values, resulting in a good match with the core measurements and (Nuclear Magnetic Resonance) NMR analysis within the same intervals.

Keywords

Permeability; porosity; Lucia model; magnetic resonance; special core analysis Water Saturation Carbonate Reservoir and Abu-Roash "D"

Recommended Citation

Elsaadany, Nashwa R.; Salah A, Mousa; Azza M, Alrawy; Oraby, Mostafa; and Mohamed I, Farahat (2026) "Integrated Carbonate Reservoir Characterization of the Upper Cretaceous Abu Roash 'D' Member Using Lucia Model, NMR, and Core Data," Egyptian Journal of Petroleum: Vol. 35 : Iss. 3 , Article 10.
Available at: https://doi.org/10.62593/2090-2468.1109

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This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.