Abstract
Abstract. INTRODUCTIONThe material which forms the basis of this project was obtained from a number of wells in the study area in Cyrenaica, the northeastern part of Libya. The study area, which is located between latitudes 25° and 33°N and between longitudes 20° and 25° E, covers some 365,750 square kilometres (see Fig. 1). The area extends from the Egyptian border in the east to the eastern flank of the Sirte Basin in the west and is part of the stable Saharan Shield.Since Precambrian time several phases of epeirogenic movements have produced troughs, horst blocks or platforms which have in turn influenced the subsequent sedimentological history of the area. In the southern and southeastern part of the study area, the basement is unconformably overlain by a thick, partially marine Palaeozoic sequence which is in turn unconformably overlain by sediments of Jurassic or younger age. The basement in the central and southwestern parts of the area is unconformably overlain by non-marine clastics of Late Jurassic and Early Cretaceous age or by marine sediments of Late Cretaceous and Tertiary age. In the eastern and northeastern section the basement is overlain by a wedge of eastward thickening marine Palaeozoic rocks which are in turn unconformably overlain by marine sediments of Late Cretaceous and Tertiary age. In the most northerly part of the northeastern region of the study area, a thick paralic sequence of Triassic, Jurassic and Early Cretaceous deposits is unconformably overlain by Late Cretaceous and Tertiary sediments.PALAEOZOICRocks of Cambro-Ordovician . . .
Highlights
The material which forms the basis of this project was obtained from a number of wells in the study area in Cyrenaica, the northeastern part of Libya
In the southern and southeastern part of the study area, the basement is unconformably overlain by a thick, partially marine Palaeozoic sequence which is in turn unconformably overlain by sediments of Jurassic or younger age
The basement in the central and southwestern parts of the area is unconformably overlain by non-marine clastics of Late Jurassic and Early Cretaceous age or by marine sediments of Late Cretaceous and Tertiary age
Summary
The material which forms the basis of this project was obtained from a number of wells in the study area in Cyrenaica, the northeastern part of Libya. ORDOVICIAN Ordovician rocks are present in the southern part of the study area and have been encountered in wells El-81, J1A-81A and I1C-81A with a variation in thickness of between 400 and 2000ft They consist predominantly of greyish-white, fine to coarse grained subrounded to subangular micaceous sandstone interbedded with dark grey shale and siltstone. The majority of the sequence in the southern part of the study area is represented by rocks of Early Carboniferous age consisting of white, coarse to very coarse, rounded and well sorted quartzitic sandstone These sandstones are commonly interbedded with dark grey siltstone and pale green or brown haematitic shale with occasional streaks of brownish to black coal. Thick section in well J1-81A consisting of dark grey to greyish green shale with rare streaks of white limestone and occasional intervals of sandstone deposited in a shallow marine, neritic to littoral environment, is considered to be of Late Cretaceous age. The Palaeozoic and Mesozoic strata dip east towards north and northwest
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