Source rock potential of selected Cretaceous shales, Orange Basin, South Africa

Akinlua, A.; Maende, Albert; Adekola, S. A.; Swakamisa, O.; Fadipe, Oluwaseun Adejuwon; Akinyemi, Segun A.

doi:10.1080/00206811003755370

Cited by 7 publications

(6 citation statements)

References 9 publications

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“…Thus indicating that the oil samples were derived from marine organic matter. Previous studies on source rock from the Orange Basin Akinlua et al, 2010;Akinlua et al, 2011) showed a prevalence of Type kerogen III over Type II and Mixed Type II/III based on Rock-Eval Pyrolysis data. However, the biomarker data of the rock extracts showed of a mixture of marine/terrigenous organic matter (Adekola et al, 2012), which is typical for a depositional setting along a continental margin like the Orange Basin.…”

Section: Origin and Depositional Environmentmentioning

confidence: 97%

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Trace element geochemistry of crude oils and condensates from South African Basins

Akinlua

Sigedle

Buthelezi

et al. 2015

Marine and Petroleum Geology

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Section: Origin and Depositional Environmentmentioning

confidence: 97%

“…Geochemistry of source rock of South African Basins is relatively fairly documented in the literature (Jungslager, 1999;van der Spuy, 2003;Akinlua et al, 2010;Akinlua et al, 2011;. However, there is paucity of data on geochemistry of crude oils from South African Basins.…”

Section: Introductionmentioning

confidence: 96%

Trace element geochemistry of crude oils and condensates from South African Basins

Akinlua

Sigedle

Buthelezi

et al. 2015

Marine and Petroleum Geology

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“…The Orange Basin is an offshore passive continental boundary of Southwest Africa's Atlantic Ocean (Fig. 1; Akinlua et al 2011;Jungslager 1999) that is bounded to the north by the Kudu Arc and to the south by the Agulhas-Columbine Arc (Fig. 2; Hirsch et al 2007;Muntingh and Brown 1993).…”

Section: The Geologic Settingmentioning

confidence: 99%

“…Orange Basin seems to be larger than the other six (6) basins in South Africa put together (McMillan 2003). Its main source is the Orange River, which empties into the South Atlantic Ocean (Akinlua et al 2011). Despite the Orange Basin being South Africa's largest offshore basin, less than 40 wells have been drilled, equating to one well per 4000 Km 2 (Muntingh 1993).…”

Section: The Geologic Settingmentioning

confidence: 99%

Biomarkers, stable carbon isotope, and trace element distribution of source rocks in the Orange Basin, South Africa: implications for paleoenvironmental reconstruction, provenance, and tectonic setting

Yelwa

Mustapha

Opuwari

et al. 2021

J Petrol Explor Prod Technol

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Aptian to Campanian sediments from the Western offshore to Central Orange Basin were studied by integrating molecular geochemistry, inorganic and isotopic studies to recognize their geochemical characteristics via the reconstruction of the Orange basin’s paleoweathering, paleosalinity, paleovegetation, paleoclimate, and tectonic records. Molecular analyses of both aliphatic and aromatic compounds reveal an input dominantly from a marine source. The source rocks accumulated in a reduced, anoxic, saline water column. Based on various biomarker proxies and vitrinite reflectance data, some samples are thermally mature to produce petroleum, while others are not. According to the V/Ni ratio, samples from the Orange Basin in South Africa are mainly anoxic, with only a few samples ranging from suboxic to anoxic. This is congruent with biomarker and isotope analyses that further indicate the presence of marine-derived source rocks with some terrestrial remains generating hydrocarbons. The investigated sediments are made up of intermediate igneous rocks that have undergone moderate chemical weathering. Geochemical figures on tectonic setting discriminant function diagrams revealed a continental rift of passive margin settings. As a result, the extrapolated crustal processes are directly analogous to the genesis and evolution of the Orange Basin, demonstrating Gondwana’s breaking up and the opening of the Atlantic Ocean Margin.

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“…The samples were left in acid for a minimum of 2 h. The acid was removed from the sample with a filtration apparatus fitted with a glass microfiber filter and the residue was dried. The details of TOC determination and Rock-Eval pyrolysis are as reported in Akinlua et al [29]. The rock samples were pulverized and homogenized by passing through a 120-mesh screen; 1.2 g of sample was used for each extraction experiment.…”

Section: Samplesmentioning

confidence: 99%

Factors Controlling Leaching of Polycyclic Aromatic Hydrocarbons from Petroleum Source Rock Using Nonionic Surfactant

et al. 2012

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The extraction of polycyclic aromatic hydrocarbons (PAHs) from petroleum source rock by nonionic surfactants with the assistance of microwave irradiation was investigated and the conditions for maximum yield were determined. The results showed that the extraction temperatures and type of surfactant have significant effects on extraction yields of PAHs. Factors such as surfactant concentration, irradiation power, sample/solvent ratio and mixing surfactants (i.e., mixture of surfactant at specific ratio) also influence the extraction efficiencies for these compounds. The optimum temperature for microwaveassisted nonionic surfactant extraction of PAHs from petroleum source rock was 120°C and the best suited surfactant was Brij 35. The new method showed extraction efficiencies comparable to those afforded by the Soxhlet extraction method, but a reduction of the extraction times and environmentally friendliness of the new nonionic surfactant extraction system are clear advantages. The results also show that microwave-assisted nonionic surfactant extraction is a good and efficient green analytical preparatory technique for geochemical evaluation of petroleum source rock.

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Source rock potential of selected Cretaceous shales, Orange Basin, South Africa

Cited by 7 publications

References 9 publications

Trace element geochemistry of crude oils and condensates from South African Basins

Trace element geochemistry of crude oils and condensates from South African Basins

Biomarkers, stable carbon isotope, and trace element distribution of source rocks in the Orange Basin, South Africa: implications for paleoenvironmental reconstruction, provenance, and tectonic setting

Factors Controlling Leaching of Polycyclic Aromatic Hydrocarbons from Petroleum Source Rock Using Nonionic Surfactant

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