... of 1.5–1.9°F/100 ft (2.7–3.5°C/100 m) and maximum TTI values, the Asu River Group and the Eze-Aku Group of sediments are still within the gas-generating stage. The Awgu Shale and the Nkporo Shale are capable of generating gas at geothermal gradients of 2.3–2.7°F/100 ft (4.2–4.9°C/100 m). The Benue trough...

..., Lekwesi Obi-agu, Eze Aku Group).( c ) Core samples of blate slate [locations 29S, 34S/35S, British Geological Survey boreholes (1998) in Oju areas, Eze Aku Group]. ...

...Figure 1 —Maps showing (A) the-geology, (B) the regional framework of southern Nigeria, and (C) the West Africa subregion and the location (box) of (A). Numbers in (A) indicate the Cretaceous and Tertiary formations shown in the stratigraphic table: 1-Asu River Group, 2-Eze-Aku Shale, 3-Awgu...

.../Afikpo Sandstone Santonian Agbani Sandstone/Awgu Shale Non-deposition/erosion 88.5 Coriacian Eze Aku Group (incl. Amasiri Sandstone) Turonian Eze Aku Group 93 100 Cenomanian-Albian Asu River Group Asu River Group Table 2. Atterberg limit of the study area Location...

... of the Albian depositional cycle. This group includes shales, limestones, and sandstones previously assigned to the Eze-Aku and Awgu Formations, and the intertonguing regressive sandstones such as the Makurdi, Agala, Amasiri, and Agbani Formations ( Murat, 1972 ; Offodile, 1976 ; Hoque, 1977...

... depositional cycle of the Abakaliki basin are the Asu River Group, the Odukpani, the Eze-Aku, and the Awgu Formations. Contemporaneously with the Santonian uplift and the deformation of the BenueAbakaliki trough, the Anambra platform subsided into a major basin and the axis of the basin was displaced...

... to brownish clay in the greater part of the formation ( Okogbue and Aghamelu, 2010b ). The discordance in dip between Albian Asu river Group and the overlying Turonian Eze-Aku Formation reported at a number of localities in Afikpo basin is indicative of time gap, and has tectonic implications...

...Figure 3. Geological map of the lower Benue trough showing well locations numbered 1-14 (see Table 1 for identifications). Box shows location of Figures 9 , 13-15, 19. AS = Asu River group, EZ = Eze-Aku Shale, AW = Awgu Shale, NK = Nkporo Shale, MA = Mamu Formation, AJ/NS = Ajali Sandstone...

... the Nkporo Shale can be seen to overstep the outcrops of the Awgu and Eze-Aku Formations onto the Asu River Group. In the field, however, the unconformity commonly is difficult to place because of the paucity of outcrops at the base of the escarpment formed by the overlying Mamu Formation. However, its...

... was controlled by three major tectonic phases, giving rise to three successive depocentres ( Murat, 1972 ; Oboh-Ikuenobe et al, 2005 ). The first phase (Albian – Santonian) was the deposition of the Asu River Group, Eze-Aku and Awgu formations within the core and the marginal areas of the Abakaliki basin...

... content also emphasize the oceanic character of the sediments at Nkalagu ( Gebhardt 2001a ). Because of the lack of lithological differences, the former Eze-Aku and Awgu Formations have been combined to the Nkalagu Formation by Petters and Ekweozor (1982a) . Nkalagu Shale, Ezillo Silt and Isimkpuma...

... of sandstone and sandy limestone are highly jointed and fractured. The influence of tectonic activities introduced the discordant dip between the Asu River Group and the overlying Turonian Eze-Aku Formation (Afikpo Basin). Younger intrusive bodies, in combination with numerous faults and joint systems, have...

... Santonian Benue Trough Turonian-Coniacian Agwu Group Cenomanian-Turonian Eze-Aku Group Aptian-Cenomanian Asu River Group Basement Precambrian-Early Cambrian Basement Complex Succeeding the Imo Formation are three laterally equivalent Formations which make up the Eocene Ameki...