الفهرس Only 14 pages are availabe for public view
 |  | from | 245 |  |  |
| | | from | 245 | | |
Abstract
The studied Jurassic succession (Q-72-1 well) lies in the subsurface of the area located to the North of Cairo-Suez District at Lat. 30º 18’ 08” N and Long. 31º 50’ 10” E, the present study depends on 312 rock samples (cuttings) covered about 941 m thickness, this Q-72-1 well begins by the Lower Jurassic with unreached base and followed unconformably by Lower Cretaceous sediments.
Generally, the Jurassic succession in Q-72-1 well was differentiated into a number of rock units; there are Wadi El Natrun Formation (Lower Jurassic), Khatatba Formation (Lias - Bathonian) and Khalig El Ayoun Formation (Bathonian - Kimmeridgian). The present microfossil study depends mainly on the foraminiferal and ostracod content, the results of identification are 118 foraminiferal species (1 new species, 11 are recorded in Egypt for the first time) belonging to 44 genera and 29 species of ostracods (4 are recorded in Egypt for the first time) belonging to 15 genera.
From the analysis of microfossils distribution charts, there are 10 microbiozones (6 foraminiferal biozones and 4 ostracod biozones) of the different studied microfossil groups were recognized throughout the whole Jurassic succession in the studied well. Depending on foraminiferal and ostracod associations, the Jurassic of Q-72-1 well has been subdivided into 5 chronostratigraphic units (Lias, Bajocian, Bathonian, Callovian - Oxfordian and Kimmeridgian). Depending on lithologies, microfossils content and the relative abundance of calcareous/agglutinated foraminifera the general paleoenvironmental conditions that prevailed during the deposition of the Jurassic sediments in Q-72-1 well were detected. Paleoecologically, five ecostratigraphic units (ecozones) have been differentiated in the studied Jurassic succession.