THE JURASSIC SYSTEM IN NORTHERN EGYPT: I. Regional stratigraphy and implications for hydrocarbon prospectivity

Keeley, M. L.; Dungworth, G.; Floyd, C. S.; Forbes, Gerald; King, Chris; McGarva, R. M.; Shaw, David M.

doi:10.1111/j.1747-5457.1990.tb00856.x

Cited by 95 publications

(26 citation statements)

References 9 publications

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“…A carbonate platform developed while the large fluviatile Dakhla Basin provided reduced input of terrigenous sediments . Important hydrocarbon source rocks were deposited along the margin during the Bathonian to Callovian, in both deltaic and marine settings (Keeley et al, 1990;Keeley and Wallis, 1991). A major regression occurred by the end-Callovian (Hirsch, 1990).…”

Section: Dogger (Middle Jurassic)mentioning

confidence: 98%

Phanerozoic geological evolution of Northern and Central Africa: An overview

Guiraud

Bosworth

Thierry

et al. 2005

Journal of African Earth Sciences

675

432

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Section: Dogger (Middle Jurassic)mentioning

confidence: 98%

Phanerozoic geological evolution of Northern and Central Africa: An overview

Guiraud

Bosworth

Thierry

et al. 2005

Journal of African Earth Sciences

675

432

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“…3) interbedded with coastal-swamp coals and carbonaceous shales (Shalaby et al, 2012). These sandstones are oil and gas reservoirs in some fields, whereas the coaly shale and shale facies represent the main hydrocarbon source rocks of the basin (Taher et al, 1988;Keeley et al, 1990;Bagge and Keeley, 1994). The coal and shales act also as seals, and thus, the Khatatba Formation represents a typical hydrocarbon source-seal-reservoir system.…”

Section: Lithostratigraphymentioning

confidence: 99%

Diagenesis in the Middle Jurassic Khatatba Formation sandstones in the Shoushan Basin, northern Western Desert, Egypt

2013

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The Middle Jurassic Khatatba Formation acts as a hydrocarbon reservoir in the subsurface in the Western Desert, Egypt. This study, which is based on core samples from two exploration boreholes, describes the lithological and diagenetic characteristics of the Khatatba Formation sandstones. The sandstones are fine‐ to coarse‐grained, moderately to well‐sorted quartz arenites, deposited in fluvial channels and in a shallow‐marine setting. Diagenetic components include mechanical and chemical compaction, cementation (calcite, clay minerals, quartz overgrowths, and a minor amount of pyrite), and dissolution of calcite cements and feldspar grains. The widespread occurrence of an early calcite cement suggests that the Khatatba sandstones lost a significant amount of primary porosity at an early stage of its diagenetic history. In addition to calcite, several different cements including kaolinite and syntaxial quartz overgrowth occur as pore‐filling and pore‐lining cements. Kaolinite (largely vermicular) fills pore spaces and causes reduction in the permeability of the reservoir. Based on framework grain–cement relationships, precipitation of the early calcite cement was either accompanied by or followed the development of part of the pore‐lining and pore‐filling cements. Secondary porosity development occurred due to partial to complete dissolution of early calcite cements and feldspar. Late kaolinite clay cement occurs due to dissolved feldspar and has an impact on the reservoir quality of the Khatatba sandstones. Open hydraulic fractures also generated significant secondary porosity in sandstone reservoirs, where both fractures and dissolution took place in multiple phases during late diagenetic stages. The diagenesis and sedimentary facies help control the reservoir quality of the Khatatba sandstones. Fluvial channel sandstones have the highest porosities and permeabilities, in part because of calcite cementation, which inhibited authigenic clays or was later dissolved, creating intergranular secondary porosity. Fluvial crevasse‐splay and marine sandstones have the lowest reservoir quality because of an abundance of depositional kaolinite matrix and pervasive, shallow‐burial calcite and quartz overgrowth cements, respectively. Copyright © 2013 John Wiley & Sons, Ltd.

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“…By Late Jurassic, a period of more extensive rifting began in Northeast Africa (Bosworth, 1994) affecting the larger parts of the Lamu embayment, Kenya, Blue Nile rift, Saudan and basins in Egypt (Keeley et al, 1990). Only during the Cretaceous did rifting commence in West Africa, and by Mid-Cretaceous, the West-Central African rifts were connected to the East African rifts by the Central African shear zone (Guiraud and Maurin, 1992).…”

Section: Discussionmentioning

confidence: 98%

Brittle deformation in the Afikpo Basin (Southeast Nigeria): Evidence for a terminal Cretaceous extensional regime in the Lower Benue Trough, Nigeria

Odigi

Amajor

2009

Chin. J. Geochem.

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This paper deals with the regional and structural framework of the Cretaceous rocks in the Afikpo Basin located in the southeastern part of the Lower Benue Trough. Results from regional tectonics are presented together with those of the microtectonic analysis of microfaults in the Owutu-Afikpo-Adadama area in the basin.The Owutu-Afikpo-Adadama ridge at the north-central part of the basin marks the boundary between the Late Cenomanian-Turonian-Conianian sediments and the Campanian-Maastrichtian sandstones. This ridge trends N45ºE on average and is faulted in three main directions, namely: (1) N-S normal faults; (2) NE-SW strike-slip faults; and (3) NW-SE strike-slip faults. The faulted rocks along these brittle discontinuities are mainly cataclastics with internal fracture cleavage and sigmoidal quartz mosaics that are reminiscent of extensional deformation. The cataclasites often bear slickenside striations.The NE-SW and NW-SE strike-slip faults are the results of the youngest brittle events on the Owutu-Afikpo-Adadama ridge. These faults were reactivated after deposition of the Campanian-Maastrichtain sediments (post-depositional faults) and, therefore, are post-Maastrichtain. Microfault analysis of these fault trends suggests an extensional regime that prevailed in the Lower Benue Trough. These results are of significance because this event is least poorly understood and less documented in contrast to the Cenomanian and Santonian events that affected the older Cretaceous strata in this region.

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THE JURASSIC SYSTEM IN NORTHERN EGYPT: I. Regional stratigraphy and implications for hydrocarbon prospectivity

Cited by 95 publications

References 9 publications

Phanerozoic geological evolution of Northern and Central Africa: An overview

Phanerozoic geological evolution of Northern and Central Africa: An overview

Diagenesis in the Middle Jurassic Khatatba Formation sandstones in the Shoushan Basin, northern Western Desert, Egypt

Brittle deformation in the Afikpo Basin (Southeast Nigeria): Evidence for a terminal Cretaceous extensional regime in the Lower Benue Trough, Nigeria

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