The assessment of potential source rocks of Maastrichtian Araromi formation in Araromi and Gbekebo wells Dahomey Basin, southwestern Nigeria

Adekeye, Olabisi A.; Akande, Samuel O.; Adeoye, James A.

doi:10.1016/j.heliyon.2019.e01561

Cited by 13 publications

(8 citation statements)

References 7 publications

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“…Major trends of the faults are in the NNE-SSW, NE-SW, NW-SE and WNW-ESE directions, respectively. The faults and fractures are well displayed on the total horizontal derivative map (Figure 8) of the study area and were responsible for fragmenting the basement into several blocks of different magnetic susceptibilities, giving it a rugose horst-graben architecture (Adekeye et al 2019;Onuoha and Ofoegbu 1988;Oladele and Ayolabi 2014;Oladele et al 2016;Okoro and Onuoha 2019). These structures generally influenced the distribution of sub-basins, petroleum systems elements, trap styles, hydrocarbon migration and other resources in the basin.…”

Section: Structural Style Of the Dahomey Basinmentioning

confidence: 98%

“…The general geology ( Figure 2) and tectonostratigraphic sequences of the Dahomey Basin which span from Cretaceous to Recent, and have been studied extensively by many researchers (e.g., Adekeye et al 2019;Omatsola and Adegoke 1981;Billman 1992;Jan Duchene 1998;Omosanya et al 2012;Kaki et al 2013;d'Almeida et al 2016;Akande et al 2018). This includes the Cretaceous Abeokuta Group, which comprise the Ise, Afowo and Araromi Formations; the Palaeocene Ewekoro Formation; the Late Palaeocene to early Eocene Akinbo Formation; the Eocene Oshosun and Ilaro Formations and the Pleistocene to Recent Benin Formation (Figure 3).…”

Section: Location Of Study and Geological Settingmentioning

confidence: 99%

“…Generalised Stratigraphic Chart of the Eastern Dahomey Basin (modified afterAdekeye et al, 2019;Akande et al 2018).…”

mentioning

confidence: 99%

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Aeromagnetic interpretation of basement structure and architecture of the Dahomey Basin, Southwestern Nigeria

Martins

Mosto

Ifeanyi

2021

NRIAG Journal of Astronomy and Geophysics

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Significant yet untapped resources still abound in the Nigerian sector of the Dahomey Basin. Although the presence of an extensive Cretaceous Petroleum System has been confirmed following recent discoveries in Aje and Ogo Fields offshore Lagos, exploration outputs in the Dahomey Basin has so far not been encouraging. Proper understanding of the basement architectural framework and controls on tectonic development remains key to unlock the unrealised potentials in the basin. Hence, a geophysical interpretation of the basement structure and architecture of the Dahomey Basin southwestern Nigeria has been carried out in this study. Various edge enhancement techniques were applied to the high-resolution residual magnetic intensity (HRRMI) grid of the area. This includes first vertical derivative (FVD), total horizontal derivative (THDR), tilt derivative (TDR) and total horizontal derivative of upward continuation (10 km). Determination of the depth to magnetic sources and sedimentary thicknesses in the study area were achieved using standard Euler deconvolution and source parameter imaging (SPI) techniques, with depth range of 4.5-6.3 km attained in the two identified sub-basins located offshore of the study area. Lineament analysis gave insights on the tectonic trends and stress-field orientation in the basin with major trends in the NNE-SSW, NE-SW, NW-SE, and WNW-ESE directions. 2D forward modelling of some selected profiles was employed to characterise the basement pattern and architecture, which depicted a horstgraben architecture. The basement structure and architecture have a major control on the distribution of sub-basins, petroleum systems elements and trap styles in the basin. The study demonstrates the robust application of high-resolution aeromagnetic data in basin-wide mapping of regional subsurface geological features, basement architecture and determination of sedimentary thickness in a frontier basin.

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Section: Structural Style Of the Dahomey Basinmentioning

confidence: 98%

Section: Location Of Study and Geological Settingmentioning

confidence: 99%

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Aeromagnetic interpretation of basement structure and architecture of the Dahomey Basin, Southwestern Nigeria

Martins

Mosto

Ifeanyi

2021

NRIAG Journal of Astronomy and Geophysics

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“…1 ) is a blend of inland/coastal/offshore basin in the Gulf of Guinea that extends from southeastern Ghana through Togo and the Republic of Benin to southwestern Nigeria 3 , 4 . It is a marginal pull—apart 12 or marginal sag basin 13 , which evolved during the period of rifting in the Late Jurassic to Early Cretaceous times 7 , 8 , 14 . The tectonism was attended by an extended period of thermally induced basin subsidence from the Middle-Upper Cretaceous to Tertiary times as the South American and African tectonic plates entered a drift phase to accommodate the emerging Atlantic Ocean 15 , 16 .…”

Section: Geological Settingmentioning

confidence: 99%

Source rock evaluation of Afowo clay type from the Eastern Dahomey Basin, Nigeria: insights from different measurements

Mohammed

Opuwari

Titinchi

2020

Sci Rep

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the cretaceous Afowo formation in the eastern Dohamey Basin is characterized by an admixture of lithofacies ranging from sandstones, claystones, shales, clays, sand/shale, and sand/clay intercalations. the sandy facies, a mix of sandstone, clay, shale, and intercalations, contain biodegraded hydrocarbons while the shales and claystones that underlie it are rich in organic matter. the hydrocarbon-bearing interval is commonly referred to as the oil sand or tar sand. in this study, Afowo clay type underlying an outcrop of the oil sand was appraised for its hydrocarbon potential with loss on ignition, thermogravimetry, and rock evaluation pyrolysis. Results obtained from loss on ignition showed that total organic matter content, a proxy to total organic carbon, for the Afowo clay type ranged from 9.410 to 38.750 wt%. The organic maturation temperature (Tmax) was determined using both thermogravimetry and rock evaluation pyrolysis (Rock-Eval). Thermogravimetric analysis produced reliable Tmax within the range of 417-424 °C for all the samples. The results from rock evaluation pyrolysis on the same samples showed that total organic carbon ranged from 0.81 to 18.46 wt% with Tmax ranging from 417 to 424 °C. It was not possible to determine Tmax for one of the samples with Rock-Eval due to a small S2 value (0.22 mg Hc/g). The variations in organic matter contents from loss on ignition agree with total organic carbon computed from rock evaluation pyrolysis; samples with high organic matter contents have corresponding high toc values. this study demonstrates that loss on ignition and thermogravimetry could complement and augment rock evaluation pyrolysis data for petroleum source rock characterization. The Dahomey Basin (Benin Basin), is situated in the province of the Gulf of Guinea (Fig. 1). The region of the Gulf of Guinea comprises wrench-modified 1 coastal and offshore basins consisting of the Ivory Coast, Tano, Saltpond, Central, Keta, and Benin Basins 2. These basins evolved in the Mesozoic era by tectonism that was characterized by block and transform faulting during the breakup of African and South American paleocontinents. The Dahomey Basin extends from southeastern Ghana through Togo and the Republic of Benin to southwestern Nigeria. The western limit of the basin is bounded by the Ghana Ridge, an offset extension of the Romanche Fracture Zone. It is separated from the Niger Delta Basin in the east by a subsurface basement high referred to as the Okitipupa Ridge 3,4. The basin hosts a large wedge of Cretaceous to Recent sediments of up to 3,000 m 5-7 , which thicken toward the offshore. The stratigraphy of the eastern sector of the basin (Eastern Dahomey Basin) in southwestern Nigeria, consists of the Cretaceous sediments of the Abeokuta Group (Ise, Afowo, and Araroromi Formations) and the Tertiary sediments of Ewekoro, Akinbo, Oshosun, Ilaro, and Benin Formations. The Afowo Formation of the Abeokuta Group, comprising of sandstones, shales, claystones, and siltstones, has been of great interest owing to reported ...

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“…Several authors have carried out detailed studies on the stratigraphy, tectonic settings, petroleum potential, foraminiferal biostratigraphy and depositional environments of the Nigerian sector of the Benin Basin (Adekeye & Akande, 2007;Okosun, 1990;Olabode, 2006;Oluwajana et al, 2021;Omatsola & Adegoke, 1981). Ajayi et al (2006) carried out a geochemical study on the Paleogene shales of the Benin Basin and reported an oxygen poor environment for these shales.…”

Section: Introductionmentioning

confidence: 99%

Paleoredox Conditions of Paleocene to Miocene Rocks of Eastern Benin (Dahomey) Basin, Nigeria: Implications for Chemostratigraphy

O¹,

A²,

A³

et al. 2021

International Journal of Geography and Geology

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The major oxides and trace elements, of two wells spanning the Paleocene -Miocene of the Benin Basin, were used to infer the varying paleoredox conditions during deposition of the different rock units and identify the chemostratigraphic boundaries. The major oxides revealed four boundaries in these wells, while trace elements suggest five and three chemostratigraphic boundaries for BH and AJ wells respectively. The information from V/Sc, Ni/V and V/(V+Ni) ratios indicates the prevalence of oxic conditions in the sandy upper 25m of the BH well and the interval between 1046 -1485m of the AJ well. The redox sensitive trace elements of the shaly middle parts of the BH well suggest dysoxic -anoxic conditions and in most parts of the AJ well. Contribution/Originality:This study is one of the very few studies which have investigated the variations in oxygenation levels in some Post-Cretaceous sediment of the Benin Basin, Nigeria. The study outlines how the distribution of redox sensitive elements was used to suggest paleoredox conditions and identify chemostratigraphic boundaries.

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The assessment of potential source rocks of Maastrichtian Araromi formation in Araromi and Gbekebo wells Dahomey Basin, southwestern Nigeria

Cited by 13 publications

References 7 publications

Aeromagnetic interpretation of basement structure and architecture of the Dahomey Basin, Southwestern Nigeria

Aeromagnetic interpretation of basement structure and architecture of the Dahomey Basin, Southwestern Nigeria

Source rock evaluation of Afowo clay type from the Eastern Dahomey Basin, Nigeria: insights from different measurements

Paleoredox Conditions of Paleocene to Miocene Rocks of Eastern Benin (Dahomey) Basin, Nigeria: Implications for Chemostratigraphy

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