الفهرس 
INTRODUCTION AND REGIONAL GEOLOGICAL SETTINGS
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Abstract
The variability of the Lower Safa reservoir in El-Obaiyed field was investigated at three different scales. The three scales correspond to seismic interpretation, wireline logs and core-plugs. The Lower Safa reservoir is a member of the Jurassic Formations; it has a wide variation in thickness, facies, and petrophysical parameters.
A consistent reservoir modeling has been developed for the Lower Safa in El-Obaiyed Field, and this geological framework is based on an integrated approach, using seismic interpretation, wireline log evaluation and core data analysis.
Interpreted seismic sections show that, the Lower Safa has a complex structural pattern. Folding system plays a predominant role in the structural setting definition. A number of step-like faults in the NE-SW direction dissects this fold. Most of these faults are throwing southeastward and northwestward with value of throw about 20 m, forming grabens and horsts pattern.
Geological observations obtained from the wireline log evaluation in El-Obaiyed Field, have been used to evaluate the depositional environment and petrophysical characteristics of the Lower Safa reservoir. Wireline log evaluation shows that, the Lower Safa is a thickening northeastward toward the deep center of the basin, and thinning southward and southwestward towards the paleo-high of Matruh basin. This study divided the Lower Safa reservoir into three units are (A-B, C and D). These units are composed of sand and shale intercalations. Higher effective porosity and permeability values are noticed for the sand, while lower values are found for the shale.
Conventional core data analysis was used for the Lower Safa heterogeneity investigation and rock typing definition. Hydraulic flow Unit (HFU) technique was used to define the number of rock typing of the Lower Safa. HFU shows that, the Lower Safa could be composed of 5 units. Core report description provided that, the evaluated wells were drilled into different two types of depositional environments for sands, the first one is the tidal environmental sand, while the second older one is the fluvial-dominated sand.
Lower Safa is considered as a deep reservoir that may have low seismic resolution. Inversion process was used for enhancing seismic image. Seismic inversion shows the change in acoustic impedance of different layers, so that continuity of layers would be adjusted. Neural Network technique was used for quantitative interpretation (QI) at the Lower Safa Member, where the produced porosity map shows a porosity range from 4 to 11, which is nearly similar to core data and wireline log evaluation.