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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\u2013Turonian 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.<\/jats:p>","DOI":"10.1144\/sp431.13","type":"journal-article","created":{"date-parts":[[2016,3,4]],"date-time":"2016-03-04T02:58:43Z","timestamp":1457060323000},"page":"219-233","source":"Crossref","is-referenced-by-count":8,"title":["Petroleum systems asymmetry across the South Atlantic Equatorial Margins"],"prefix":"10.1144","volume":"431","author":[{"given":"William","family":"Dickson","sequence":"first","affiliation":[{"name":"DIGs, Houston, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Craig F.","family":"Schiefelbein","sequence":"additional","affiliation":[{"name":"Geochemical Solutions International, Houston, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mark E.","family":"Odegard","sequence":"additional","affiliation":[{"name":"Grizzly Geosciences, Ennis, Montana, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John E.","family":"Zumberge","sequence":"additional","affiliation":[{"name":"Geomark Research, Houston, TX, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1881","published-online":{"date-parts":[[2016,3,3]]},"reference":[{"key":"e_1_3_2_2_1","volume-title":"Western Africa Oil, Gas\/LNG & Energy Conference","author":"Azonto Petroleum Ltd","year":"2014","unstructured":"Azonto Petroleum Ltd 2014. 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