By Monzer Makhous
This publication unearths the most developments of the formation of petroleum swimming pools in significant elements of North African basins. It bargains with the neighborhood geology of this significant oil- and gas-producing sector. Emphasis is laid on paleoenvironmental and provenance reconstructions, seize formation, diagenesis, compaction-decompaction equilibria in petroleum-bearing reservoirs and similar fluid geodynamics and oil and fuel new release and entrapment. natural and mineral interplay is proven to be the most technique in improving reservoir entrapment and filtration houses. This consists of an in depth 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 power in sedimentary basins. numerous new techniques and substitute equipment are proposed in petroleum geology.
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Extra info for Formation of Hydrocarbon Deposits in the Northern African Basins: Geological and Geochemical Conditions
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. The above-described diagenetic processes are best developed in moderately subsided basins. The detrital grains underwent transformations leading to a well-defined equilibrium with the chemical conditions prevailing, at the paleosurface.
The later structural inversion of the Triassic basins during the Upper Mesozoic led to a renewed outcropping of the edges of the basins and of other less subsided basins. The recent subterraneous waters which are little mineralized and 42 Chapter 2 • Characteristic Features o f the Region often of neutral pH are able to dissolve the carbonate, sulfate and halite cements as well as feldspars and iron oxides. In the Oued el-Mya and Ghadames Basins the Triassic formation waters were intensely altered by the penetration of acid solutions originating in deeper strata.
4 Partial Conclusion The results obtained on the association of the clay minerals as well as on the crystallochemical pecularities of the Triassic deposits in the Triassic Province lead us to conclude that the association Mg-chlorite + swelling trioctahedral mineral + Fe-illite may be interpreted as an indication of the dolomite-sulfate stage of the salinization of a sedimentary basin of the terrigenous-chemical type. 1 General Situation This facies is represented by an argillaceous-arenaceous complex with a high halite content ranging from z-3% to 15-2o% in certain regions.