http://repository.unizik.edu.ng/handle/123456789/86 Department of Applied Geophysics 2026-04-04T02:52:06Z http://repository.unizik.edu.ng/handle/123456789/1152 Title: STRUCTURAL EVIDENCE FOR PAN-AFRICAN EVENT IN THE SW BASEMENT BLOCK OF NIGERIA: THE IGARRA EXAMPLE Authors: OBIADI, I. I.; OBIADI, C. M.; AJAEGWU, N. E.; ANAKWUBA1, E. K.; ONUIGBO, N. E.; MADUEWESI1, U. V.; OKOLO, C. M.; EZIM, O. E. Abstract: Fractures and folds are common evidences for post-formational deformation in rocks. They result from the action of stress on the rocks and as such bear imprints of the nature and magnitude of the deformative force. The style and orientation of the recorded strain reflect the interaction between the applied force (stress) and the pre existing rock body. Force is a vector quantity, having both magnitude and direction. The stress acting normal against a surface can be resolved into three mutually perpendicular principal axes of maximum stress σ1, intermediate stress σ2 and minimum stress σ3; while the resultant strain can also be resolved into three mutually perpendicular principal strain axes. There exist some relationship between the applied stress and the resultant strain (structures). This relationship shows correspondence between the principal stress axes and the principal strain axes. Structural analysis using the stress and strain relationship technique was carried out at Igarra. Fractures and folds characterized in the crystalline basement rocks at Igarra shows that the orientation of the strike of the fractures and the fold axes of the folds are dominantly in the N-S direction. Assuming pure shear, and that the strain on a large scale is essentially homogeneous statistically, reflecting both the orientation and size of the bulk finite strain; the orientation, style and intensity of the mapped structures suggest a dominantly E W directional compressional stress. This generally agrees with the tectonic location and orientation, geologic and lithologic relationships of the Pan-African suites and indicates that the Pan-African event played a major role in the structural evolution of the Schist Belt. Description: Scholarly work 2015-01-01T00:00:00Z http://repository.unizik.edu.ng/handle/123456789/1097 Title: Application of geostatistical seismic inversion in reservoir characterization of Igloo Field, Niger Delta, Nigeria. Authors: Anakwuba, E. K.; Onwuemesi, A. G.; Anike, O. L.; Onyekwelu, C. U.; Chinwuko, A. I.; Akachikelu, N. C; Obiadi, I. I.; Yakubu, H. M. Description: Conference Paper 2013-01-01T00:00:00Z http://repository.unizik.edu.ng/handle/123456789/1073 Title: Gully Erosion in Anambra State, South East Nigeria: Issues and Solution Authors: Obiadi., I.I; Nwosu, C.M; Ajaegwu., N.E; Anakwuba., E.K; Onuigbo, N.E; Akpunonu, E.O,; Ezim, O.E. Abstract: Gully erosion in Anambra state, South East Nigeria has continued to pose a challenge to Geoscientist and other environmental scientist. The menace has taken its toll on the socioeconomic wellbeing of the people living in the affected area and the country at large such that lands used for aesthetic, agricultural and industrial purposes, ancestral homes, crops, livestock and other infrastructure are everyday lost to the hazard at alarming rate. Field studies showed that the environmental hazard has remained active over the years, defying control measures put in place by government, communities and individuals – no thanks to the peculiar geologic, geotechnical, hydrogeologic, hydrogeochemical, climatic and anthropogenic factors at play in the area. This paper reviews the causes and effects of gully erosion in Anambra State in particular and South East Nigeria in general. It also proposes specific and multidisciplinary approach to gully erosion control that will stand the test of time. Description: Scholarly work 2011-01-01T00:00:00Z http://repository.unizik.edu.ng/handle/123456789/1064 Title: Late Miocene to Early Pliocene Palynostratigraphy and Palaeoenvironments of ANE-1 Well, Eastern Niger Delta, Nigeria Authors: Ajaegwu, N.E.; Odoh., B.I.; Akpunonu, E.O; Obiadi, I.I; Anakwuba, E.K Abstract: Fifty ditch cutting samples composited at 60ft intervals between 6990ft and 9930ft in the Ane-1 well, Niger Delta were processed for sedimentological and palynological analyses. The sedimentological study showed that the analysed section belongs to the paralic Agbada Formation. The section is subdivided into three lithofacies subunits based on their shale/sand ratios: Lower Biafra (9,930-8,035ft), Middle Biafra (8,035-7,115ft), and Upper Biafra (7,115-6990ft). A total of 632 palynomorphs were identified from which some were selected for microphotography. The diagnostic palynomorphs recovered permitted the zonation and dating of the analysed section. A Late Miocene to Early Pliocene age was assigned to the studied section with Miocene/Pliocene boundary placed at 8150ft and marked by First Appearance Datum (FAD) of Nymphaeapollis clarus and increase in Monoporites annulatus. The section belongs to the Echitricolporites spinosus Zone. Palaeoenvironmental interpretation of strata penetrated by Ane-1 well was conducted by combining association of environmentally restricted marker species; percentage of Zonocostites ramonaein the total palynomorphs sum; nature of organic matter in the sediment; and lithological characters of the strata. The result shows that the overall environment ranges from coastal to marginal marine. Foram test linings was used to subdivide the macro environments into coastal deltaic, coastal deltaic inner neritic, and inner neritic. Description: Scholarly work 2012-01-01T00:00:00Z