AAPG HEDBERG CONFERENCE 2-5 July, 2018. Sigüenza. Spain Kenya´s world class lacustrine source rock: A geochemical analysis and proven petroleum system Anderson, L1,*, Grimmer, J.1,*, Cajas, L.1, Rodrigo, G.1, Gómez, R.1, Cuñado, E.1, García, M.F.2 1 CEPSA E&P S.A. Torre Cepsa, Paseo de la Castellana 259A, 28046 Madrid, Spain. 2 CEPSA S.A.U. Centro de Investigación, Avenida Punto Com 1, 28805 Alcalá de Henares, Spain. * Corresponding author:
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[email protected] Introduction Until Cepsa drilled Tarach-1 (2016) in Block 11A, Lotikipi Basin NW Kenya, the presence of a proven Tertiary source rock was restricted to the Tullow operated Lokichar Basin blocks some 200 kms southeast of Cepsa´s area of interest (figure 1). The prolific lacustrine petroleum system of the Lokichar Basin has now yielded around 1 BBO recoverable resources. Figure 1. Block 11A – Regional Setting East Africa Rift System Block 11A is located at the junction of the N-S Tertiary East Africa Rift System (EARS) and the NW- SE trending Cretaceous Rift System (CARS) (figure 1). The existence of both Tertiary and Cretaceous rift basins should not be ruled out, the lack of stratigraphic control in the immediate area should not exclude the possibility of more than one rifting event. The EARS is composed of two rift trends called the Eastern and the Western branches. The Eastern branch is located North and East of the Lake Victoria and corresponds to the volcanic system that forms the Kenya and the Ethiopian Rifts.