Sedimentary petrology and provenance interpretation of the sandstone lithofacies of the Paleogene strata, south-eastern Nigeria

Geophysical Study of Parts of Oru Area Imo State Nigeria Using Electrical Resistivity Method

“…A tidally influenced coastal plain depositional environment saw to the deposition of sediments within the Northern part of the study area which may be described as mudstone, carboniferous mudstone, claystone, gritty claystone and massive sandstone facies [6]. These materials are suggested to be deposited during the late phase of Miocene-Oligocene after which the Benin formation deposition covering the south end of Oru through Ibiasoegbe and parts of Nempi broke in during Pleistocene.…”

Depositional facies, sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya, southeast Nigeria

“…Outcropping stratigraphic units of the Niger Delta overlying the Anambra Basin are comprised of four lithostratigraphic units: the Imo Formation with an average thickness of ~1000 m; the Ameki Group with thickness that ranges from 1400 to 1900 m; the Ogwashi Formation with estimated thickness of ~250 m and the Benin Formation that is about 2000 m thick at the depocenter ( Simpson, 1955 ; Reyment, 1965 ; Nwajide, 1980 ; Arua, 1986 ; Ekwenye et al., 2015 ). The Imo Formation forms the basal outcropping stratigraphic unit of the Niger Delta.…”

“…Nwajide (2006) established that Abakiliki anticlinorium is one of the sources of sediments for the Anambra and Abakaliki (Afikpo) Basins, which later became contributors to the Cenozoic Niger Delta Basin fills that advanced from the Thanetian onwards ( Figure 3 ). Eastern Nigerian Oban Massif is also an important source for the Cenozoic sediments of the Niger Delta Basin ( Ekwenye, 2015 ). The Ameki Group (Ameki, Nanka and Nsugbe Formations) sediments were laid down in an estuarine, tidal, barrier ridge-lagoon complex and open marine systems, after the major Paleocene marine transgression of the second depositional cycle at the site of the rift triple junction ( Short and Stauble, 1967 ; Nwajide, 2013 ; Ekwenye, 2014 ).…”

“…The Ameki Group (Ameki, Nanka and Nsugbe Formations) sediments were laid down in an estuarine, tidal, barrier ridge-lagoon complex and open marine systems, after the major Paleocene marine transgression of the second depositional cycle at the site of the rift triple junction ( Short and Stauble, 1967 ; Nwajide, 2013 ; Ekwenye, 2014 ). The sediments were deposited under semi-humid to humid paleoclimatic conditions ( Ekwenye et al., 2015 ). Hence, the present study is an attempt to unravel the stratigraphic heterogeneity of the Nanka Formation.…”

Geophysical Study of the Weathered and Near Surface Zone in Parts of Oru Area, Imo State Nigeria Using Seismic Refraction Method

“…A tidally influenced coastal plain depositional environment saw to the deposition of sediments within the Northern part of the study area which may be described as mudstone, carboniferous mudstone, clay stone, gritty clay stone and massive sand stone faces [12].…”