Nigeria finds oil and gas in commercial quantities in anambra. The basin is bounded to the north by bida basin and northern nigeria massif, to the east by benue trough, to the west by west africa massif and to the south by the niger delta complex fig 1. It extends northwestward into the niger valley, northward to the jos massif and northeastward into lafia. P4and itiowe k5 1,5department of geology, university of port harcourt, port harcourt, nigeria 2 dept. Subsurface evaluation of source rock and hydrocarbon potential of the anambra basin, south eastern nigeria iheanacho princewill ugochukwu dissertation. The total aeromagnetic data covering the study area was subjected to first vertical derivative, spectral depth analysis, and source parameter imaging spi. Rock and hydrocarbon potential of the anambra basin, south eastern nigeria pdf. The anambra basin, located in the southern benue trough is a post santonian synclinal sedimentary structure containing over 5,000m thick of upper cretaceous to recent sediments. Sedimentological attributes and stratigraphic of nanka formation, anambra basin,nigeria acra 2e. This study is a contribution to the understanding of the play fairway in the anambra basin. Paleoecology of enugu and mamu formations in anambra basin, southeastern nigeria onuigbo e. Foraminiferal and palynological biostratigraphy of stratigraphic formation, port harcourtenugu expressway, anambra basin, nigeria adiela u. Pdf drainage morphology of imo basin in the anambra imo.
Stakeholders on water have asked the anambra imo river basin development authority to embark on the recycling or reuse of waste water to ensure rapid economic development of its catchment areas. The western flank of the basin is delineated by ns trending nigerbenue river system that. Onuoha department of geology, university of nigeria, nsukka, enugu state, nigeria. The basin is situated west of the lower benue trough and is. Palynological and sequence stratigraphy characterization of the earlylate campanian nkporo shale, orekpekpeimiegba area, anambra basin, nigeria adebayo olajide f. Basin a is suspected to be the extension of the benue trough across the study area, while basin b is the anambra basin. The present work is thus aimed at assessing and ascertaining structural development in the. Olatunji palystrat limited, ibadan nigeria madukwe, henry y department of geology, ekiti. Play fairway evaluation of the anambra basin, southeast nigeria. Estimating the thickness of sedimentation within lower benue.
Preliminary assessment of source rock potential and palynofacies analysis of maastrichtian dark shale, sw anambra basin edegbai, a. Geochemical record for the depositional condition and petroleum. Sedimentary succes sions in these basins are of middle mesozoic to recent age. The anambra basin is situated west of the lower benue trough and is often considered youngest formation of the benue trough.
The stratigraphic successions in the bida basin and their relationship to those in the. The study area lies within the anambra basin and it is made up of enugu shale, mamu formation, ajali sandstone, and nsukka formation. Anambra basin is one of nigerias inland sedimentary basins, where petroleum exploration activities are presently taking place. It is a nearly triangular shaped depression covering about 3000 km 2 and containing 6000 m thick cretaceous and tertiary sediments ekine and onuoha, 2008.
Though the anambra river basin was known to be rich in crude oil and gas deposits. Controversy surrounding the stratigraphy of the anambra basin, depositional environments and conditions, and age of geologic formations. This uplift led to the westward shift of the depocenter and subsidence of the anambra basin and the afikpo sub basin during the campanian. Orient petroleum resources plc opr was established to harness the vast but mostly untapped mineral, agricultural and human resources, especially hydrocarbon deposits in anambra basin, for the industrialization of the area, improvement of the socioeconomic wellbeing of the people while creating value for the stakeholders. This study involved the delineation of all the river subbasins in the imo basin of the anambraimo river basin area. Petroleum potentials of the nigerian benue trough and. The available petroleum systems within the cretaceous interval in the anambra basin will be outlined. It is frequently regarded as the northwestern extension of the anambra basin, both of which were major depocentres during the third major transgressive cycle of southern nigeria in late cretaceous times.
This page bundles the available data for the anambra basin in the africa. Trace fossils from the campanian maastrichtian enugu. U2 1department of petroleum engineering, nigerian agip oil company, port harcourt department of geology, university of port harcourt, port harcourt, nigeria abstract. Oct 30, 2016 the study area lies within the anambra basin, in southeastern nigeria figure 2. The anambra basin results from the santonian upliftment of. The anambra basin is a roughly triangular basin containing more than 5 km thick of sediments of varied lithologies. Gravity models as tool for basin boundary demarcation. Biostratigraphy and paleoenvironment of the coniacian awgu. The areal extent maps were generated using the reports of the stratigraphic subsurface horizons of amansiodo1, ihandiagu1, igbariam1, alo1, anambra river1, akukwa1, and nzam1. Geological interpretation of the high resolution aeromagnetic data over okigweudi area, anambra basin, nigeria, using 3d euler deconvolution and 2d spectral inversion methods.
It the area drained by measuring all the tributaries and their stream order. Although the basin has not been fully covered by seismic investigations and remains undrilled, both ground and. It was done by estimating the geographic extent of the basins petroleum system in order to create the. The anambra basin, located in the southern benue trough is a post santonian synclinal sedimentary structure containing over 5,000m thick of upper cretaceous to recent. The stratigraphic succession of the anambra basin, at the second sedimentary phase, comprises the campanianmaastrichtian enugunkporoowelli formations which are lateral equivalents.
The southern benue trough and anambra basin, southeastern. Gravity studies in the bida basin put the maximum thickness of the sedimentary successions at about 3. It was done by estimating the geographic extent of the basin s petroleum system in order to create the areal extent maps. The main oil source formations of the anambra basin. The study area is a significant part of anambra river basin stratigraphy and is basically, a result of the paleohydrogy of the region durham et al, 2008.
The images are hyperlinks and will open up a separate window with a high resolution pdf image of the map. Sedimentology,sequence stratigraphy,anambra basin,nanka formation and eocene. Paleoecology of enugu and mamu formations in anambra basin. Biostratigraphy and paleoenvironment of the coniacian awgu formation in nzam1 well, anambra basin, southeastern nigeria. The anambra basin is an important inland sedimentary basin in nigeria with a potential habitat for. The investigated sections consist of coarsening upward sequences with thick, dark gray shale at the base, grading upward through siltstones into.
Anambra basin is located in the south eastern part of nigeria. The study was conducted using composite of the three land uses from different locations viz. This study involved the delineation of all the river subbasins in the imo basin of the anambra imo river basin area. It is frequently regarded as the northwestern extension of.
Anambra basin has about 6,000 m of sedimentary rocks. Accepted 23 august, 2010 structural analysis of joints and fault data obtained from exposures of the enugu and mamu formations. Biostratigraphy and paleoenvironment of the coniacian. Geological interpretation of the high resolution aeromagnetic. Controversy surrounding the stratigraphy of the anambra basin, depositional. This study aimed at determining the geology and depositional environmental of these formations through field relationship and grain size distribution morphologic studies. A study was undertaken to determine the physico chemical and mechanical properties of soils of owukpa lower coal measure geological formation of. About 30 tcf of gas and 1 bn barrels of crude oil has been found in the anambra river basin in anambra state, the director of engineering standard in the department of petroleum. Nigeria is underlain by seven major sedimenta ry basins, viz. Maximum sediment thickness in this area is about 6 km i. Department of geology, faculty of physical sciences, university of benin, benincity, nigeria correspondence. The states theme is light of the nation, formerly known as the home for all. Department of geology, ekiti state university, ado ekiti nigeria olaburaimo a.
Aug 12, 2003 about 30 tcf of gas and 1 bn barrels of crude oil has been found in the anambra river basin in anambra state, the director of engineering standard in the department of petroleum resources dpr, mr patrick onwumere, said in awka. Ditch cutting samples from an exploratory nzam1 well located in the northwestern part of anambra basin were subjected to lithological. Profile line 3 appears to have passed through the centre or deepest part of the anambra basin. Palynology, source rock potential and thermal maturity of. Oil seepages have also been reported from parts of the basin. Index map of niger delta and offshore nigeria showing the anambra basin and abakaliki fold belt after doust and omatsola, 1989.
Kinematics of faults and joints at enugu area of the anambra basin d. Introduction this study examines part of the sedimentary units of the eocene nanka formation of. The anambra basin was initiated as a result of the uplift of the abakaliki anticlinorium during the. Depositional environments, organic richness, and petroleum. Anambra basin is one of the basins in nigeria, habouring the largest deposit of subbituminous coal and lignite. This name later came to be shortened to anam bra anambra, the name it officially bears to date. The main geologic units of the study area are the nanka sand ecocene, overlain by ogwashiasaba, formation oligocene and underlain by imo. Integration of electrical resistivity and induced polarization for subsurface imaging around ihe pond, nsukka, anambra basin, nigeria. Paleoenvironmental deductions from grain size analysis.
The sedimentary rocks comprise ancient cretaceous deltas, somewhat similar to the niger delta, with the nkporo shale, the mamu formation, the ajali sandstone and the nsukka formation as the main deposits. The study area lies within the anambra basin, in southeastern nigeria figure 2. Nov 28, 20 this study is a contribution to the understanding of the play fairway in the anambra basin. Anambra basin, enugu shale, rockeval pyrolysis, total organic carbon, source rock, thermal maturation introduction the anambra basin figure 1 which is a cretaceous basin is located in the southern part of the regionally extensive northeastsouthwest trending benue trough. These sediments contain alternating shales and siltstones with occurrences of sandstone.
The stratigraphic succession of the anambra basin, at the second. It is a nearly triangular shaped depression covering about 3000 km 2 and. Anambra and bida basins indicates thats the successions of the anambra basin reached up to 8 km thickness compared with an average of 3. The basin is bounded to the south by the niger delta basin hinge line. Sedimentology and sequence stratigraphy of the eocene. Depositional environment of siliciclastic deposits on the. Palynological and sequence stratigraphy characterization of the earlylate campanian nkporo shale, orekpekpeimiegba area, anambra basin, nigeria adebayo. The basin is a nwse trending embayment, perpendicular to the main axis of the benue trough and the niger delta basin fig.
M 2 6 2departmentof chemical and geological sciences, alhikmah university, ilorin, nigeria 7 3department of geology, university of ibadan, ibadan, nigeria. A study was undertaken to determine the physico chemical and mechanical properties of soils of owukpa lower coal measure geological formation of anambra basin, nigeria. The anambra basin was initiated as a result of the uplift of the abakaliki anticlinorium during the santonian. Anambraimo river basin development authority asked to. Onitsha, a historic port city from precolonial times is the largest urban area in the state. Trace fossils from the campanian maastrichtian enugu formation. The result from the first vertical derivative shows that the northern part of the area is covered by the young biotite granite of precambrian origin, and the western edge is covered by the old granite, gneisses, and migmatite of western. This study will contribute additional knowledge to the.
The main oil source formations of the anambra basin, southeastern nigeria. The present work is thus aimed at assessing and ascertaining structural development in the benue trough along with the relationship of the igneous activities and sedimentation deposition as compiled by several published reports. Subsurface evaluation of source rock and hydrocarbon. Structural interpretation of part of anambra basin nigeria using aeromagnetic and landsat etm data. Palynologiacal and paleoenvironmental investigation of the. Use of geochemical fossils as indicators of thermal. The sedimentary rocks comprise ancient cretaceous deltas, somewhat similar to the niger delta, with the nkporo shale, the mamu formation.
Anambra basin is one of the energyrich inland sedimentary basins in nigeria. Orient petroleum resources plc opr was established to harness the vast but mostly untapped mineral, agricultural and human resources, especially hydrocarbon deposits in anambra basin, for the. Department of geology, anambra state university, uli. Asu river group is the oldest stratigraphic unit in anambra basin. The ajali sandstone outcrops in the anambra basin and afikpo syncline comprises very. The anambra basin contains over 6 km thick of cretaceous and tertiary. Anambra basin, enugu shale, rockeval pyrolysis, total organic carbon, source rock, thermal maturation introduction the anambra basin figure 1 which is a cretaceous basin is located in the. Pdf structural interpretation of part of anambra basin. Maximum sediment thickness in this area is about 6.
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