In this book, Eight wells were interpreted using the composite well logs and seismic sections in order to understanding of the stratigraphy of the offshore, Nile Delta, Egypt. Lithostratigraphic studies aided recognition of the Miocene-Pliocene rock formations (from base to top); Sidi Salim Formation, Rosetta Formation, Abu Madi Formation, Kafr El Sheikh Formation, El Wastani Formation and Mit Ghamr/Bilqas Formation (Sea Bed). Present study, therefore, is to examine in detail the sequence stratigraphy in the NW Nile Delta area and the hydrocarbon occurrences in the study area. For this purpose, a stratigraphic analysis of the recorded formations was carried out in the NW part of the Nile Delta area.understanding the role of gas chimney and associated structures as preferential hydrocarbon migration pathways from the pre-Messinian kitchen section to the Plio-Pleistocene reservoirs.