Diagenetic contrast of sandstones in hydrocarbon prospective Mesozoic rift basins (Ethiopia, UK, USA)

Wolela, A.

doi:10.1016/j.jafrearsci.2014.05.007

Cited by 6 publications

(4 citation statements)

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“…The eastern part of the country is composed mainly of Mesozoic carbonates and Tertiary sediments covering roughly a quarter of the country's surface area (Wolela 1997(Wolela , 2007(Wolela , 2008. The remaining areas are covered by Precambrian basement rocks.…”

Section: Overview Of Climate Geology and Hydrogeologymentioning

confidence: 99%

Review: Groundwater resource potential and status of groundwater resource development in Ethiopia

2019

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The groundwater resources potential of Ethiopia is estimated to be about 40 billion cubic meters. Groundwater has been used as the main source of water supply since the 1970s for the main cities, towns and dispersed rural communities across the country, where provision of reticulated surface-water schemes is often expensive because of initial project construction costs and poor water quality. The exponential growth of the urban population and agriculture-led industrial development have resulted in greater attention to groundwater as the potentially cost-effective water supply source. As part of the growing focus on the use of groundwater, the Ethiopian government is currently implementing irrigation projects. One plan involves nine irrigation projects covering an estimated area of 8,000 ha, being developed on a pilot scale, with 9,000 test wells, 28,000 monitoring wells and 14,657 spring improvements. If this unprecedented Ethiopian groundwater-centred development plan is implemented successfully at such a scale, it is highly likely that its success will persuade other Sub-Saharan developing nations to put in place the necessary policies, regulations and investment for infrastructure and capacity development for exploring, exploiting and managing their groundwater resources.

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Section: Overview Of Climate Geology and Hydrogeologymentioning

confidence: 99%

Review: Groundwater resource potential and status of groundwater resource development in Ethiopia

2019

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“…The NW-SE trending Blue Nile (Abay) Basin (Fig. 1) is interpreted as a failed arm of the Karoo Rift System which has undergone a number of tectonic phases (Russo et al, 1994;Wolela, 1997). A first phase of Karoo rifting in the Carboniferous -Permian resulted in the initial formation of the Blue Nile and Ogaden Basins (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…1a) (Cannon et al, 1981;Hunegnaw et al;Salman and Abdula, 1995;Wolela, 1997;Worku and Astin, 1992) with sediment deposition taking place in fault-bounded blocks and sag basins (Morley et al, 1999). During a second phase of rifting (Early to Middle Jurassic) during the breakup of Gondwana, deposition of marine transgressive siliciclastics, evaporites and carbonates took place in the Ogaden and Blue Nile Basins (Bunter et al, 1998;Hunegnaw et al, 1998;Salman and Abdula, 1995;Wolela, 1997). Finally, during the Early Cretaceous, a marine regression coincided with the deposition of shallow-marine and fluvial deposits of the Muger Mudstone and Debre Libanos Sandstone.…”

Section: Geological Settingmentioning

confidence: 99%

“…Black shales with high TOC values in that area have been described as potential source rocks (Wolela, 2007). The Lower Carnian -Lower Toarcian Adigrat Sandstone, Portlandian -Aptian Muger Mudstone and Barremian -Cenomanian Debre Libanos Sandstone are potential reservoir rocks, whereas the Lower Callovian -Upper Tithonian Antalo Limestone and the Upper Bathonian Gohatsion Formation are possible source rocks sealed by the Oligocene volcanics (Wolela, 1997(Wolela, , 2007(Wolela, , 2009.…”

Section: Introductionmentioning

confidence: 99%

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Source Rock Potential and Depositional Environment of Middle – Upper Jurassic Sedimentary Rocks, Blue Nile Basin, Ethiopia

Mohammedyasin

Littke

Wudie

et al. 2020

Journal of Petroleum Geology

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This study investigates the hydrocarbon generation potential, kerogen quality, thermal maturity and depositional environment of Middle – Upper Jurassic sedimentary rocks in the Blue Nile Basin, Ethiopia, using organic petrography, Rock‐Eval pyrolysis and molecular organic geochemistry. Thirty‐seven outcrop samples were analysed for their total organic carbon (TOC) and inorganic carbon (TIC) contents. The samples came from a Toarcian – Bathonian transitional glauconitic shale‐mudstone unit, the overlying Upper Bathonian Gohatsion Formation, and the Lower Callovian – Upper Tithonian Antalo Limestone Formation. Thirteen samples with sufficient TOC contents for further analysis of the organic matter, eight from the Antalo Limestone Formation and five from the glauconitic shale‐mudstone unit, were selected and analysed using Rock‐Eval pyrolysis. Vitrinite reflectance (VRr) was measured on random particles, and qualitative maceral analysis was performed under normal incident and UV light. Nine samples were selected for molecular organic‐geochemical analyses. All the samples originating from the Gohatsion Formation showed TOC values which were too low for further analyses of the organic matter. The TOC contents of shales and limestones from the Antalo Limestone Formation and and of shales from the glauconitic shale‐mudstone unit were 3.43‐6.43% (average 4.85%) and 0.76‐3.15% (average 1.72%), respectively, and two coaly shale samples from the latter unit have average TOC values of 18.48%. HI values are very high for shales in the Antalo Limestone Formation (average 575 mg HC/g TOC) but lower for the shales in the glauconitic shale‐mudstone unit. The vitrinite reflectance of shales from the Antalo Limestone Formation ranged between 0.21% and 0.47%; coaly shales from the glauconitic shale‐mudstone unit have VRr% of between 0.29% and 0.35%. Pr/Ph ratios for samples of the Antalo Limestone Formation shales ranged from 0.8 to 1.1, indicating anoxic to suboxic depositional conditions; while shales in the glauconitic shale‐mudstone unit show higher values of up to 4.9. In terms of organic petrography, the Antalo Limestone Formation samples are dominated by finely dispersed liptinite particles and alginite; the organic material in the glauconitic shale‐mudstone unit is of higher land plant origin, with abundant vitrinite and inertinite. Sterane and hopane biomarker ratios suggest an anoxic/suboxic depositional environment for the Antalo Limestone Formation shales and limestones. These values together with Rock‐Eval Tmax (average 414 °C), the high ratio of pristane and phytane over the n‐alkanes C17 and C18, and hopane biomarker ratios indicate that the Middle – Upper Jurassic succession is of low thermal maturity in the central parts of the Blue Nile Basin. The Antalo Limestone Formation shales have a high petroleum generation potential, making them a viable target for future exploration activities.

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Main Controlling Factors and Model of Hydrocarbon Accumulation in Beach-Bar Facies in the Upper Part of the Fourth Member of Shahejie Formation in the Southern Slope of Dongying Sag, China

Sun,

Wang,

Liu

et al. 2023

Springer Series in Geomechanics and Geoengineering

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Diagenetic contrast of sandstones in hydrocarbon prospective Mesozoic rift basins (Ethiopia, UK, USA)

Cited by 6 publications

References 106 publications

Review: Groundwater resource potential and status of groundwater resource development in Ethiopia

Review: Groundwater resource potential and status of groundwater resource development in Ethiopia

Source Rock Potential and Depositional Environment of Middle – Upper Jurassic Sedimentary Rocks, Blue Nile Basin, Ethiopia

Main Controlling Factors and Model of Hydrocarbon Accumulation in Beach-Bar Facies in the Upper Part of the Fourth Member of Shahejie Formation in the Southern Slope of Dongying Sag, China

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