الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 243 |  |  |
| | | from | 243 | | |
Abstract
The present thesis deals with the identification of the potentiality and maturation of source rocks, as well as, the crude oil characteristics in some subsurface Upper Cretaceous sediments distributed in the area of Ras Qattara Lease of the northern Western Desert, Egypt. The investigated site located in the northwestern part of the main Qattara Depression, northwest the great Abu El Gharadig Basin (known as Ras Qattara Lease). It occupies about 5310 km2 between latitudes 29o 19` and 30o 30` N; and longitudes 27o 00` and 27o 36` E. It devotes to study the tectonic setting, subsurface configuration, source rock evaluation and the geochemical characteristics of the Upper Cretaceous oils. A comprehensive analytical evaluation programme has been applied on the available eighteen drilled wells composite logs, ditch and cutting (110 samples), in addition to four crude oil samples raised from one of the productive fields within the respective study area. Generally, the study area can be subdivided into two subbasins. The thickness variation, facies changes and the structural setting of the Upper Cretaceous sediments are dealt with. The organic geochemical studies on representative samples revealed the potentiality of both Bahariya Formation and Abu Roash <U+2013> G Member as a potential source rocks. The study of gas chromatograms of nalkanes and Rock Eval Pyrolysis reflect mixed organic matter with considerable contribution of marine sources. This organic matter is of type III/II or II/III kerogen. The organic geochemical studies on crude oils reflect the mixed organic matter deposited under transitional environment and show no biodegradation derived from deeper mature sediments. Moreover, the oil <U+2013> source correlation, revealed remarkable differences in the gross chemical composition exist between them. The oil samples show a degree of maturation more than the extracts. Hence, the studied crude oils were possibly migrated from deeply buried source rocks which are at higher levels of maturity, rather than from the immature, shallower source rocks encountered in the study area.