It extends northwestward into the niger valley, northward to the jos massif and northeastward into lafia. Though the anambra river basin was known to be rich in crude oil and gas deposits. Paleoecology of enugu and mamu formations in anambra. Kinematics of faults and joints at enugu area of the anambra basin d. The areal extent maps were generated using the reports of the stratigraphic subsurface horizons of amansiodo1, ihandiagu1, igbariam1, alo1, anambra river1, akukwa1, and nzam1. Although several works have proved the existence of oil and gas in the campanian to maastrichtian strata of the anambra basin, it is still. Eocene lithic fills in the anambra basin and afikpo syncline is divisible into three main transgressiveregressive cycles reyment, 1965. Salient indications for maturity article pdf available may 2015 with 4,504 reads how we measure reads. The basin is bounded to the south by the niger delta basin hinge line. View enhanced pdf access article on wiley online library html view download pdf. Province three digits to the right of region code 3162.
Oil seepages have also been reported from parts of the basin. Pdf structural interpretation of part of anambra basin. Stratigraphic section of the anambra basin from the late cretaceous. The study area is part of anambra basin, south eastern nigeria, which lies between longitude 7o00e 7o30e and latitude 6o00n 6o30n fig.
The images are hyperlinks and will open up a separate window with a high resolution pdf image of the map. The anambra basin is a cretaceoustertiary basin, which is the structural link between the cretaceous benue trough and the tertiary niger delta basin lucas and ishiekwene, 2010. The cretaceous pro spects especially the sedimentary sequences of the anam bra basin, are expected to provide better options for hy. The origin and tectonic history of the benue trough and in. Department of geology, ekiti state university, ado ekiti nigeria olaburaimo a. Sedimentation in the anambra basin thus commenced with the early campanian early maastrichtian of the enugu and nkporo formations lateral equivalents which consist of a sequence of bluish to dark grey shale and mudstone locally with sandy shales, thin sandstones and shelly limestone beds. This study has shown that there is more oil in the anambra basin. The codes for the regions and provinces are listed in klett and others 1997. Hydrodynamic flow and formation pressures in the anambra. Anambra is the 3rd industrialized state in nigeria anambra is the second urbanized state in nigeria anambra has the fourth largest economy in nigeria after lagos, porthacourt and abuja anambra has. Aromatic hydrocarbon distribution and calculation of oil and gas volumes in postsantonian shale and coal, anambra basin, nigeria, by i. Dispersal patterns of the late cretaceous to early.
The anambra basin is a cretaceous basin having almost a roughly triangular shape figure 1 with a total. Benue trough was displaced westward resulting in subsidence of the anambra basin. These cycles correspond to major marine incursions in the late. Asu river group is the oldest stratigraphic unit in anambra basin. Post deformational sedimentation in the lower benue trough, therefore, constitutes the anambra basin. Sedimentological attributes and stratigraphic of nanka formation, anambra basin,nigeria acra 2e. Quantitative analysis of vitrinite reflectance data from the anambra basin, nigeria, has revealed for the first time tectonism and unconformities corresponding to the campanianmaastrichtian and. The anambra basin is situated west of the lower benue trough and is often considered youngest formation of the benue trough. Onuoha department of geology, university of nigeria, nsukka, enugu state, nigeria. The analysis and interpretation of the data sets allow the reconstruction of sedimentary facies parameters, diagenetic histories, dominant controls on sequence development, and allow an added interpretation of the sediments of the northern niger delta and anambra basin reservoir.
Reservoir evaluation within the sequence stratigraphic. Apr 05, 2017 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. Pdf the study area lies within the anambra basin and it is made up of enugu shale, mamu formation, ajali sandstone, and nsukka. Petroleum potentials of the nigerian benue trough and anambra.
Sedimentation in the anambra basin thus commenced with the early campanian early maastrichtian of the enugu and nkporo formations lateral equivalents which consist of a sequence of bluish to dark. Diagenetic study of sandstone sediments in parts of. 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. The anambra basin, therefore, is a part of the lower benue trough containing postdeformational sediments of campanianmaastrichtian to eocene ages. Paleogeography, sedimentation and tectonics of the upper. Sedimentation in the anambra basin thus commenced with the campanianmaastrichtian marine and. Gravity models as tool for basin boundary demarcation.
Excitement as orient petroleum strikes oil in anambra. The images are hyperlinks and will open up a separate window with a high resolution pdf. Nov 28, 20 this study is a contribution to the understanding of the play fairway in the anambra basin. Geochemical and geophysical investigations of kaolin.
This study aimed at determining the geology and depositional environmental of these formations through field relationship and grain size distribution morphologic studies. The stratigraphic succession of the midniger basin, collectively referred to as the nupe group adeleye, 1973 comprises a two fold northern bida basin sub basin and southern bida sub basin or lokoja sub basin. Olatunji palystrat limited, ibadan nigeria madukwe, henry y department of geology, ekiti. Sedimentology and sequence stratigraphy of the nkporo group campanianmaastrichtian, anambra basin, nigeria. Valley, onyeama, okpara and ribadu were worked by the the anambra basin. 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. Biostratigraphy and paleoenvironment of the coniacian. Geology and mineral resources of the lower benue trough. This page bundles the available data for the anambra basin in the africa. Postdeformational sedimentation in the lower benue trough, therefore, constitutes the anambra basin. These sediments contain alternating shales and siltstones with occurrences of sandstone. Structural interpretation of part of anambra basin nigeria using aeromagnetic and landsat etm data. The main oil source formations of the anambra basin, southeastern.
Mosto onuoha department of geology, university of nigeria, nsukka, nigeria. Anambra basin is one of the basins in nigeria, habouring the largest deposit of subbituminous coal and lignite. Integration of electrical resistivity and induced polarization for subsurface imaging around ihe pond, nsukka, anambra basin, nigeria. Anambra basin is one of the energyrich inland sedimentary basins in nigeria. Accepted 23 august, 2010 structural analysis of joints and fault data obtained from exposures of the enugu and mamu formations. The sequence includes lower maastrichtian subbituminous coals in the anambra basin. Geological and mineral map of the study area adapted from. Hydrodynamic flow and formation pressures in the anambra basin, southern nigeria k. The anambra basin developed during the thermal sag phase of the benue trough evolution, which formed following the platewide inversion tectonics that occurred in the santonian and possibly continuing into the maastrichtian in the northern benue trough and chad basin. The qualitative interpretation revealed that the area is intensely faulted with major anomalies faults trending in the northeast and. Pdf structural, stratigraphic and combination traps on.
The bida basin is assumed to be a northwesterly extension of the anambra basin akande et al. 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 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 characteristics of ajali sandstone at. Anambra basin showing the extension of ajali sandstone drawn from.
This name later came to be shortened to anam bra anambra, the name it officially bears to date. Controversy surrounding the stratigraphy of the anambra basin, depositional environments and conditions, and age of geologic formations. Maximum sediment thickness in this area is about 6 km i. Aspects of hydrocarbon potential of the tertiary imo shale.
The stratigraphic successions in the bida basin and their relationship to those in the. 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 successions were invaded by intrusives, volcanic rocks, and veintype leadzinc minerals, especially in the albiancenomanian section of the abakaliki anticline. Biostratigraphy and paleoenvironment of the coniacian awgu formation in nzam1 well, anambra basin, southeastern nigeria. Ditch cutting samples from an exploratory nzam1 well located in the northwestern part of anambra basin were subjected to lithological. It is logical to include the anambra basin in the benue trough, being a related structure. This study aimed at determining the geology and depositional. It is bounded to the north by bida basin and northern nigerian massif, to the east by benue trough, to the west by west african massif, and to the south by niger delta 14. This could have introduced an accuracy which is beyond the original data. Palynofacies studies of sedimentary succession in ogbabu1. The main oil source formations of the anambra basin. The anambra basin is one of the cretaceous sedimentary basin of nigeria, bounded on the southwestern flank by the niger delta hinge line, northwest by the benue flank and southeast by the abakaliki fold belt.
Palynological and palaeoenvironmental study of the middle. The study area falls within anambra state, nigeria and it is located between latitude 0600 l n to 0655 l n and longitude 00607 l e to 00711 l e fig. Kinematics of faults and joints at enugu area of the. Paleoecology of enugu and mamu formations in anambra basin. Sedimentology,sequence stratigraphy,anambra basin,nanka formation and eocene. Sedimentology and sequence stratigraphy of the eocene nanka.
Ditch cutting samples from an exploratory nzam1 well located in the northwestern part of anambra basin. The total aeromagnetic data covering the study area was subjected to first vertical derivative, spectral depth analysis, and source parameter imaging spi. It is frequently regarded as the northwestern extension of the anambra basin. Evidence from field relationship and sedimentological study adeigbe, o. The sedimentary rocks comprise ancient cretaceous deltas, somewhat similar to the niger delta, with the nkporo shale, the mamu formation. Geochemical and geophysical investigations of kaolin deposits. The sediments of anambra basin include the albiansediments which comprise of asu river group. Parasitological investigation of bagrid fishes in anambra river basin in anambra state, nigeria was carried out for two months between the month of april and may, 2015. The study area lies within the anambra basin and it is made up of enugu shale, mamu formation, ajali sandstone, and nsukka formation. The cretaceous pro spects especially the sedimentary sequences of the anam bra basin. The anambra basin, it is generally characterized by sediments of cretaceous and younger ages.
Introduction this study examines part of the sedimentary units of the eocene nanka formation of anambra basin exposed at lat. Paleoecology of enugu and mamu formations in anambra basin, southeastern nigeria onuigbo e. Profile line 3 appears to have passed through the centre or deepest part of the anambra basin. Anambraimo river basin development authority asked to. Source rock assessment and hydrocarbon prospects of anambra basin. Nigeria is underlain by seven major sedimenta ry basins, viz.
Assessment of aeroradiometric data of southern anambra basin 745 kuforijimi, olorunsola. Hydrocarbon generation indications from source rock to. Ladtpo department of geology and mlnera sciences university of llorln p. Sedimentary succes sions in these basins are of middle mesozoic to recent age. Petroleum system two digits to the right of province code 316205. Campanomaastrichtian paleoenvironment, paleotectonics and. Depositional environments, organic richness, and petroleum. Basin a is suspected to be the extension of the benue trough across the study area, while basin b is the anambra basin. Anambra basin has about 6,000 m of sedimentary rocks. Biostratigraphy and paleoenvironment of the coniacian awgu.
A total of 102 bagrid fishes belonging to 4 genera and 7 species were subjected to parasitological investigation, only 32 fishes were infected with a parasitic prevalence of 31. Pdf geology and depositional environment of campano. Petroleum potentials of the nigerian benue trough and. P4and itiowe k5 1,5department of geology, university of port harcourt, port harcourt, nigeria 2 dept. Play fairway evaluation of the anambra basin, southeast nigeria. Anambra basin is one of the basins in nigeria, habouring the largest deposit of sub bituminous coal and lignite. The main oil source formations of the anambra basin, southeastern nigeria.
The formations encountered in the study area were deposited in the anambra basin as a result of marine transgression that occurred during. The shaly facies grade laterally to sandstones of the owelli and afikpo formations in the anambra basin. Detrital rocks are formed by the sedimentation of minerals and rock fragments that were derived from mechanical breakdown of preexisting rocks in the source area, and were transported to a depositional site basin. Analysis of the sedimentological and stratigraphical characteristics of the deposits allix, 1987 shows three main period figure 3 in the evolution of the basin.
Sedimentology and depositional environment of the mid. The basin data is derived from a lower resolution grid which has been upsampled using gmt. Case studies of anambra and abakaliki basins, southeastern nigeria rita u. Ten 10 representatives outcrop samples collected from two stratigraphic sections in the study area were analyzed chemically using inductively. Update on developments in anambra statephotos politics. Assessment of aeroradiometric data of southern anambra. Palynological and sequence stratigraphy characterization of the earlylate campanian nkporo shale, orekpekpeimiegba area, anambra basin, nigeria adebayo olajide f. It was done by estimating the geographic extent of the basin s petroleum system in order to create the areal extent maps.
In exposed cretaceous deposits on a northwestsoutheast section from enugu to abakaliki, mean random vitrinite. Kinematics of faults and joints at enugu area of the anambra. 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 coals in the anambra geographically and found throughout much of the basin outcrop mainly in enugu area where four mines. The basin is a nwse trending embayment, perpendicular to the main axis of the benue trough and the niger delta basin fig. Hydrocarbon generation indications from source rock to reservoir rock. Structural interpretation of part of anambra basin nigeria. Palynological and sequence stratigraphy characterization of the earlylate campanian nkporo shale, orekpekpeimiegba area, anambra basin, nigeria adebayo. Assessment unit two digits to the right of petroleum system code 31620504. The tectonic, stratigraphic and organic geochemical evaluations of these basins suggest the similarity with the contiguous basins of chad and niger republics and sudan, where commercial oil discovery have been made. The stratigraphic evolution can be outlined using subsurface data and correlation along sections connecting several wells in the anambra basin.
Chapter 4 the benue trough ibrahim badamasi babangida. The anambra basin is situated at the western flank of the southern benue trough, bounded to the west by the precambrian basement complex rocks of western nigeria, to the east by the abakaliki anticlinorium, and to the south by the northern portion of the niger delta petroleum province fig. The basin is 300km nesw trendingsyncline, located at the south western dip of the benue trough in south eastern nigeria. Although several works utilizing subsurface seismic data acquired within the inland anambra basin and the neighbouring onshore and offshore section of the niger delta basin have revealed the. The anambra basin is located in the southeastern part of nigeria. Geochemistry of maastrichtian clastic sedimentary rocks from. Sedimentation in the anambra basin thus commenced with the early campanian early maastrichtian of the enugu and nkporo formations lateral equivalents which. Geology and mineral resources of the lower benue trough, nigeria. Assessment of hydrogeophysical and geotechnical properties in.
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