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Accueil du site → Doctorat → Allemagne → 2010 → Geophysical Reservoir Evaluation of Obaiyed Field, Western Desert, Egypt

Technischen Universität Berlin (2010)

Geophysical Reservoir Evaluation of Obaiyed Field, Western Desert, Egypt

Farag, Mohamed Ibrahim Abdel-Fattah Ibrahim

Titre : Geophysical Reservoir Evaluation of Obaiyed Field, Western Desert, Egypt

Geophysikalische Reservoir Evaluierung des Obaiyed-Feldes, westliche Wüste, Ägypten

Auteur : Farag, Mohamed Ibrahim Abdel-Fattah Ibrahim

Université de soutenance : Technischen Universität Berlin

Grade : DOKTOR DER NATURWISSENSCHAFTEN Dr. rer. nat. 2010

Résumé
The Obaiyed Gas Field is located in the Western Desert of Egypt, some 50 km south of the Mediterranean coast. It produces gas from the Upper Safa member of Khatatba Formation (Middle Jurassic). The Upper Safa reservoir has become an important exploration target in the Obaiyed field and has helped to revitalize exploration in the northwestern part of the Western Desert in Egypt. Therefore, the main purpose of this thesis is the evaluation of hydrocarbon potential of the Upper Safa reservoir through integration of 2D seismic and well logging data. In the last years, with the advent of powerful computer workstations, the ability to perform interactive 3D modelling has become commonplace throughout the petroleum industry. This change in modelling capability represents a profound expansion of the modeller’s ability to comprehend the seismic response to complex tectonical structures. The advantage of 3D modelling lies in its capability to allow the interpreter to elaborate a plausible structure model by constructing cross sections along any line of section and through any well. The exploration objective is the structural definition of the Upper Safa reservoir. The Khatatba (Zahra) and Lower Safa member have been modelled to modify the trap in regard to fault and fold structures. Synthetic seismographs and check shots were constructed to tie seismic data (time) with well data (depth) and to obtain a velocity model. The velocity model is used to convert the time domain model to a depth domain model. Seismic profiles across the Obaiyed gas field are used to illustrate the structural framework of the Upper Safa reservoir. 3D structural modelling divides the study area to several compartments which can be used to propose locations for future exploration wells in the area. Many geological and geophysical methods have been found satisfactory for locating hydrocarbon occurrences but these are indirect methods. They indicate the structural and stratigraphic locations, where hydrocarbons might be found. However, they give no evidence whether there might indeed be a significant accumulation at depth. The only method available for answering these questions is the exploratory well. Well log analysis of Upper Safa reservoir was performed to identify hydrocarbon bearing zones and study reservoir properties based on data from 24 wells. The main petrophysical parameters needed to evaluate a reservoir are its porosity, permeability, hydrocarbon saturation and thickness. The objective of the present study deals with the determination of the lithology by using different log responses, e.g. gamma-ray logs, porosity logs and different crossplots. This integrated study aims to a qualitative interpretation of well log data and to calculate the shale volume, effective porosity, hydrocarbon saturation (movable and residual), and to predict the net-pay of the producible zones. Data integration was facilitated by the PetrelTM, Schlumberger’s reservoir modelling software. The integrated model has been used to support key operational and future field development decisions. The results of this study improve also the reservoir characterization of the Upper Safa sandstone facies, help to identify potential stratigraphic traps for hydrocarbons and hence will aid regional exploration

Mots Clés : Seismische Interpretation , Well Log Analyse , Reservoir Modellierung , Obaiyed Feld , Westliche Wüste , Ägypten , Seismic Interpretation , Well Log Analysis , Reservoir Modelling , Obaiyed Field , Western Desert , Egypt

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Page publiée le 8 novembre 2011, mise à jour le 12 mai 2019