الفهرس 
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Abstract
The present work is concerned with the Neogene-Quaternary subsurface sedimentary succession of Tao Field in the Offshore North Sinai, Nile Delta Basin. This study aims to assess the sandstones of the Pliocene Kafr El-Sheikh and El-Wastani Formations. The integration of the stratigraphy, the seismic data and the tectonics would help us to produce an overall view of the study area. The interpretation of all available seismic data using the PETREL-software enables to make basin prospect or field-scale 2D seismic interpretation and mapping in order to draw an integral view for the proposed aim of the work. The seismic sequence analysis of available data allows the investigated succession to be divided into two mega-sequences: the Pre- and Post-Messinian Mega-sequences. The Miocene rock units are included in the Pre-Messinian Mega-sequence, whereas the targeted rock units are included in the Post-Messinian Mega-sequence. Different structural features are identified in the study area, including Slides, Slumps, Growth faults and collapse structures as shallow structures. Also, listric faults, roll-over fold and salt diapir are identified as deep structural features. The major structural trend is oriented NW-SE. The evaluation for being promising gas reservoirs in the study area depended on interpretation of available well log data in four wells (Tao-1, Tao-2, Tao-6 and Tao-8). The well logs data analysis demonstrated that only Tao-1 Well proved to be potential gas reservoir. The favorable zone within El-Wastani Formation is found between depths 670.3m and 681.6m (Zone A). Moreover, the favorable zones in Kafr ElSheikh Formation have depths: 1299–1316.8m (Zone B) and 1430–1477.5m (Zone C). El-Wastani Formation Zone A is the most efficient gas-bearing zone in Tao-1 Well; since it possesses zero VSh, low SW (10%) and low BVW (0.04). Moreover, the sandstones of Kafr ElSheikh Formation in Tao-1 embrace two reservoir zones, (B and C) with total thickness of 17.8m and 47.5m respectively. Furthermore, the achieved results revealed that zones B and C are expected to produce gas-free water.