Article Figures & Data
Figures
- Fig. 1.
Tectonic elements map of East Africa, derived from the papers in this compilation and multiple other sources, including Macgregor (2015).
- Fig. 2.
Various interpretation of the continent–ocean boundary of East Africa, derived from the papers in this compilation. Editors ‘compromise interpretation’ (purple) based on mapping of rifts and inversion structures normally considered as indicative of extended continental crust and other sources including Stanca et al. (2016). The map also shows the geographical location of fields listed in Table 1 and of the papers in part I of this thematic set. Basin colouring scheme as in Figure 1.
Tables
Basin Field type Approximate reserves Reservoir Source rock Seal Trap type Reference Albertine Jobi-Rii 308 MMbbls Middle Miocene fluvial clastics Late Miocene lacustrine shale Late Miocene lacustrine shale, fault plane seal related to dynamic charge system. Possible ultimate tar mat sideseal Multiple fault blocks with fault plane seal Abeinomugisha & Kasande (2012); Simon et al. (2017) South Lokichar Ngamia 297 MMbbls Early Miocene fluvial clastics
(Auwerwer and Lokone Formations)Early Miocene lacustrine shale
(Lokone Shale)Early Miocene lacustrine shale, basement and/or conglomerate sideseal 3-way dip versus hanging wall of basin bounding fault Africa Oil Corp (2016) Mafia Deep Mzia 5 Tcf Campanian intraslope basin fill turbidites ponded by Seagap fracture zone Early to Middle Jurassic, lacustrine to shallow marine Deep marine shales, onlap to major downcut/unconformity 3-way dip on structure related to Seagap fracture zone inversion against onlap surface Pike et al. (2015); Sayers (2016); Brown (2013) Rovuma Prosperidade-Mamba 80 Tcf Multiple reservoirs from Eocene to Miocene, main reservoir in Oligocene, turbidites reshaped by contourite currents Early to Middle Jurassic, lacustrine to shallow marine Multiple deep marine shales 3-way dip versus downthrown side of inner toe thrust and/or stratigraphic pinchout Fletcher (2017); Palermo et al. (2014) Mozambique Pande and Temane 5 Tcf Maastrichtian–Paleocene shoreface to shallow shelf sandstones (Grudja Formation) Neocomian–Aptian marine shale (Domo Formation) Maastrichtian–Paleocene shallow marine shales, lateral facies change to coastal shales 3-way dip versus stratigraphic (coastal) pinchout Dale et al. (2016); Logering & Milkov (2017) Ogaden Calub and Hilala 4 Tcf Late Triassic to Early Jurassic transgessive sandstone, Late Permian fluvial sandstone Early Triassic lacustrine shale (Bokh Formation) Early Jurassic transgressive shales, Early Triassic lacustrine shale Fault block and drape Hunegnaw et al. (1998); Zhou et al. (2013) Morondava/Sakamena Bemolanga and Tsisimoro (heavy oil) Up to 6000 MMbbls in place Late Triassic fluvial sandstone
(Isalo Formation)Early Triassic lagoonal to lacustrine shale (Middle Sakamena Formation) Late Triassic fluvial shale Exhumed fault block, heavily segmented by volcanic intrusions Clark & Rasoanandrianina (2002)
Introduction to the thematic set: Tectonics and petroleum systems of East Africa
