By Monzer Makhous
This booklet finds the most developments of the formation of petroleum swimming pools in significant components of North African basins. It bargains with the neighborhood geology of this crucial oil- and gas-producing sector. Emphasis is laid on paleoenvironmental and provenance reconstructions, capture formation, diagenesis, compaction-decompaction equilibria in petroleum-bearing reservoirs and comparable fluid geodynamics and oil and gasoline new release and entrapment. natural and mineral interplay is proven to be the most procedure in improving reservoir entrapment and filtration homes. This consists of a detailed organization of the resource and seize formations in time and area. the pc application for basin modeling simulates the burial and thermal histories and petroleum strength in sedimentary basins. numerous new strategies and replacement tools are proposed in petroleum geology.
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Extra info for The Formation of Hydrocarbon Deposits in the North African Basins: Geological and Geochemical Conditions
Under the conditions of the original distribution of temperature, pressure and pore water chemistry the eogenetic and mesogenetic mineral complexes became unstable and started to react with the actual subterranean waters in an attempt to achieve a new equilibrium. These weakly mineralized waters with a near-neutral pH became able to leach the carbonate, sulfate and h/tlite cements and generated a secondary porosity. 5 1. 8 km. Despite differences in the transport conditions of the detrital materials we observe in the different sedimentary basins a similarity between the respective diagenetic phenomena resulting mainly from the sedimentary environment.
Mineralogical analysis furnishes morphological data on the clay minerals in the Lower Devonian section. g. in the Tiguentourine (Tg-38), that there was a degradation of detrital illite by a leaching under the influence of freshwater. In the Zarzaitine (Zt-1), however, we identified a mixedlayer phase with 3o% swelling layers in which the particles are elongate platy, possibly resulting from the recrystallization of smectite. The presence of a small quantity of smectite particles in the rocks of the Lower Devonian section might be due to the transformation of felsic volcanic components introduced into the sediments.
The Visd is characterized by further subsidence of the Carboniferous Basin. In the central portion of the Ghadames Depression (HADq) sandy-arenaceous and calcareous sediments were deposited with a thickness of 7oo m, showing that the subsidence z4 Chapter 2 . Characteristic Features of the Region was very strong and of an eustatic nature. 6). The clay mineral spectrum is made up essentially of illite, kaolinite, chlorite and mixed-layer swelling clays of the illite-smectite type. The qualitative and quantitative composition of the clay minerals depends on their depositional environment.