none 10.1144/SP431.13 Geological Society of London Geological Society of London 1881 80906352 65091 2024072316113400566 10.1144 2024-07-24T00:04:36Z 2016-03-03T21:58:43Z 8 Geological Society, London, Special Publications SP 0305-8719 2041-4927 09 08 2016 01 2016 431 1 William Dickson DIGs, Houston, TX, USA Craig F. Schiefelbein Geochemical Solutions International, Houston, TX, USA Mark E. Odegard Grizzly Geosciences, Ennis, Montana, USA John E. Zumberge Geomark Research, Houston, TX, USA Abstract We describe an examination of two lines of evidence, tectono-structural evolution and hydrocarbon geochemistry, of asymmetric opening of the Atlantic Equatorial Margin. Our structural mapping used compilations of geophysical data and a review of both published literature and oil company public presentations. Geochemically, we accessed regional non-exclusive oil studies of the conjugate margins of Africa and South America, plus considerable published material. A group of non-exclusive oils was refined to 286, which clustered into five families, all represented along the NE Brazil margin but only one along the West African Transform (WAT) margin. Multiple lacustrine-sourced oils were seen around the South Atlantic, including NE Brazil, but a rich, oil-prone lacustrine source was not indicated offshore Ivory Coast and Ghana. Despite minor evidence of mixed source, possibly lacustrine stringers within an alluvial to marine setting, the predominant source is marine Cretaceous (Cenomanian–Turonian and possibly Albian). We find that opening asymmetry (a) biased the location of lacustrine (Early to mid-Cretaceous prerift to early synrift) source rocks to the NE Brazil margin and (b) locally narrowed the width of the optimal marine (Mid-Late Cretaceous postrift) WAT Margin source kitchens. Burial of the latter has aggravated the risk of late charge from light (condensate and gas) hydrocarbons. 03 03 2016 01 2016 219 233 10.1144/SP431.13 https://doi.org/10.15223/policy-002 10.1144/SP431.13 https://www.lyellcollection.org/doi/10.1144/SP431.13 https://www.lyellcollection.org/doi/pdf/10.1144/SP431.13 https://pubs.geoscienceworld.org/books/book/1799/chapter/107695316/petroleum-systems-asymmetry-across-the-south https://pubs.geoscienceworld.org/UrlRedirectHandler.ashx?routename=books&chapterdoi=10.1144/SP431.13&request=chapter Western Africa Oil, Gas/LNG & Energy Conference Azonto Petroleum Ltd 2014 Azonto Petroleum Ltd 2014. Azonto: Cote D'Ivoire & Ghana in Portfolio. In: Western Africa Oil, Gas/LNG & Energy Conference, Windhoek, Namibia. 15 April, 1–20 [last accessed 28 May 2014]. 10.5724/gcs.01.21.0538 10.1029/2010JB007686 Abstracts, AAPG Meeting Brice S. 30 1980 BriceS., KeltsK. & ArthurM. 1980. 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