The images are hyperlinks and will open up a separate window with a high resolution pdf. Anambra basin is one of the basins in nigeria, habouring the largest deposit of subbituminous coal and lignite. Gravity models as tool for basin boundary demarcation. Oil seepages have also been reported from parts of the basin. Sedimentology and sequence stratigraphy of the eocene nanka. These cycles correspond to major marine incursions in the late.
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. 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. P4and itiowe k5 1,5department of geology, university of port harcourt, port harcourt, nigeria 2 dept. Biostratigraphy and paleoenvironment of the coniacian. Depositional environments, organic richness, and petroleum. The cretaceous pro spects especially the sedimentary sequences of the anam bra basin, are expected to provide better options for hy. The sequence includes lower maastrichtian subbituminous coals in the anambra basin. Case studies of anambra and abakaliki basins, southeastern nigeria rita u. Anambra basin is one of the basins in nigeria, habouring the largest deposit of sub bituminous coal and lignite.
Pdf source rock assessment and hydrocarbon prospects of. The shaly facies grade laterally to sandstones of the owelli and afikpo formations in the anambra basin. Ten 10 representatives outcrop samples collected from two stratigraphic sections in the study area were analyzed chemically using inductively. The images are hyperlinks and will open up a separate window with a high resolution pdf image of the map. Campanomaastrichtian paleoenvironment, paleotectonics and. Stratigraphic section of the anambra basin from the late cretaceous. 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. Mosto onuoha department of geology, university of nigeria, nsukka, nigeria. Dispersal patterns of the late cretaceous to early. Petroleum potentials of the nigerian benue trough and anambra. These sediments contain alternating shales and siltstones with occurrences of sandstone.
It is frequently regarded as the northwestern extension of the anambra basin. Sedimentology and sequence stratigraphy of the nkporo group campanianmaastrichtian, anambra basin, nigeria. 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. Hydrocarbon generation indications from source rock to. Nigeria is underlain by seven major sedimenta ry basins, viz. Paleoecology of enugu and mamu formations in anambra. 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. Palynological and sequence stratigraphy characterization of the earlylate campanian nkporo shale, orekpekpeimiegba area, anambra basin, nigeria adebayo olajide f. Asu river group is the oldest stratigraphic unit in anambra basin. The main oil source formations of the anambra basin. The anambra basin, it is generally characterized by sediments of cretaceous and younger ages. Geology and mineral resources of the lower benue trough. Hydrodynamic flow and formation pressures in the anambra basin, southern nigeria k.
Profile line 3 appears to have passed through the centre or deepest part of the anambra basin. Sedimentological characteristics of ajali sandstone at. The investigated sections consist of coarsening upward sequences with thick, dark gray shale at the base, grading upward through siltstones into. Paleoecology of enugu and mamu formations in anambra basin, southeastern nigeria onuigbo e.
Ladtpo department of geology and mlnera sciences university of llorln p. Biostratigraphy and paleoenvironment of the coniacian awgu formation in nzam1 well, anambra basin, southeastern 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 a cretaceous basin having almost a roughly triangular shape figure 1 with a total. The main oil source formations of the anambra basin, southeastern nigeria. Although several works have proved the existence of oil and gas in the campanian to maastrichtian strata of the anambra basin, it is still. Sedimentation in the anambra basin thus commenced with the campanianmaastrichtian marine and. The stratigraphic evolution can be outlined using subsurface data and correlation along sections connecting several wells 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. Paleoecology of enugu and mamu formations in anambra basin. The anambra basin is located in the southeastern part of nigeria. Reservoir evaluation within the sequence stratigraphic. Assessment of aeroradiometric data of southern anambra. Nov 28, 20 this study is a contribution to the understanding of the play fairway in the anambra basin. Sedimentological attributes and stratigraphic of nanka formation, anambra basin,nigeria acra 2e. The codes for the regions and provinces are listed in klett and others 1997. Geochemistry of maastrichtian clastic sedimentary rocks from. The anambra basin, therefore, is a part of the lower benue trough containing postdeformational sediments of campanianmaastrichtian to eocene ages. Diagenetic study of sandstone sediments in parts of. 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.
This name later came to be shortened to anam bra anambra, the name it officially bears to date. Evidence from field relationship and sedimentological study adeigbe, o. Update on developments in anambra statephotos politics. Excitement as orient petroleum strikes oil in anambra. Structural interpretation of part of anambra basin nigeria. 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 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. Salient indications for maturity article pdf available may 2015 with 4,504 reads how we measure reads. Pdf structural, stratigraphic and combination traps on. Chapter 4 the benue trough ibrahim badamasi babangida. 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.
Palynological and palaeoenvironmental study of the middle. Anambraimo river basin development authority asked to. Anambra basin has about 6,000 m of sedimentary rocks. 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. Hydrocarbon generation indications from source rock to reservoir rock. Pdf the study area lies within the anambra basin and it is made up of enugu shale, mamu formation, ajali sandstone, and nsukka. The basin data is derived from a lower resolution grid which has been upsampled using gmt. Aromatic hydrocarbon distribution and calculation of oil and gas volumes in postsantonian shale and coal, anambra basin, nigeria, by i.
Ditch cutting samples from an exploratory nzam1 well located in the northwestern part of anambra basin. 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 study area lies within the anambra basin and it is made up of enugu shale, mamu formation, ajali sandstone, and nsukka formation. Controversy surrounding the stratigraphy of the anambra basin, depositional environments and conditions, and age of geologic formations. Olatunji palystrat limited, ibadan nigeria madukwe, henry y department of geology, ekiti. It is logical to include the anambra basin in the benue trough, being a related structure. Geological and mineral map of the study area adapted from. Post deformational sedimentation in the lower benue trough, therefore, constitutes the anambra basin. Pdf structural interpretation of part of anambra basin.
Paleogeography, sedimentation and tectonics of the upper. Analysis of the sedimentological and stratigraphical characteristics of the deposits allix, 1987 shows three main period figure 3 in the evolution of the basin. The sedimentary rocks comprise ancient cretaceous deltas, somewhat similar to the niger delta, with the nkporo shale, the mamu formation. 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. Benue trough was displaced westward resulting in subsidence of the anambra basin. Table 1 shows the stratigraphic succession of the cretaceous and tertiary basins of southern nigerian with the anambra basin sandwiched between the abakaliki. It extends northwestward into the niger valley, northward to the jos massif and northeastward into lafia. The basin is 300km nesw trendingsyncline, located at the south western dip of the benue trough in south eastern nigeria.
Department of geology, ekiti state university, ado ekiti nigeria olaburaimo a. The main oil source formations of the anambra basin, southeastern. This could have introduced an accuracy which is beyond the original data. 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. Integration of electrical resistivity and induced polarization for subsurface imaging around ihe pond, nsukka, anambra basin, nigeria. Geochemical and geophysical investigations of kaolin deposits. This study aimed at determining the geology and depositional. Sedimentology and depositional environment of the mid. Petroleum potentials of the nigerian benue trough and. The cretaceous pro spects especially the sedimentary sequences of the anam bra basin. The bida basin is assumed to be a northwesterly extension of the anambra basin akande et al. The stratigraphic successions in the bida basin and their relationship to those in the. The origin and tectonic history of the benue trough and in.
The areal extent maps were generated using the reports of the stratigraphic subsurface horizons of amansiodo1, ihandiagu1, igbariam1, alo1, anambra river1, akukwa1, and nzam1. Assessment unit two digits to the right of petroleum system code 31620504. Anambra basin showing the extension of ajali sandstone drawn from. Aspects of hydrocarbon potential of the tertiary imo shale. Though the anambra river basin was known to be rich in crude oil and gas deposits. Pdf geology and depositional environment of campano. 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. 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. Subsurface evaluation of source rock and hydrocarbon potential of the anambra basin, south eastern nigeria pdf. The anambra basin is situated west of the lower benue trough and is often considered youngest formation of the benue trough. Introduction this study examines part of the sedimentary units of the eocene nanka formation of anambra basin exposed at lat. Postdeformational sedimentation in the lower benue trough, therefore, constitutes the anambra basin.
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. Source rock assessment and hydrocarbon prospects of anambra basin. Hydrodynamic flow and formation pressures in the anambra. Sedimentary succes sions in these basins are of middle mesozoic to recent age. These successions were invaded by intrusives, volcanic rocks, and veintype leadzinc minerals, especially in the albiancenomanian section of the abakaliki anticline. The total aeromagnetic data covering the study area was subjected to first vertical derivative, spectral depth analysis, and source parameter imaging spi.
Geochemical and geophysical investigations of kaolin. Sedimentology,sequence stratigraphy,anambra basin,nanka formation and eocene. 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. This study has shown that there is more oil in the anambra basin. This study aimed at determining the geology and depositional environmental of these formations through field relationship and grain size distribution morphologic studies. The sediments of anambra basin include the albiansediments which comprise of asu river group.
Kinematics of faults and joints at enugu area of the anambra basin d. Ditch cutting samples from an exploratory nzam1 well located in the northwestern part of anambra basin were subjected to lithological. Structural interpretation of part of anambra basin nigeria using aeromagnetic and landsat etm data. Eocene lithic fills in the anambra basin and afikpo syncline is divisible into three main transgressiveregressive cycles reyment, 1965. Province three digits to the right of region code 3162. Maximum sediment thickness in this area is about 6 km i. Sedimentation in the anambra basin thus commenced with the early campanian early maastrichtian of the enugu and nkporo formations lateral equivalents which. 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 qualities.
The qualitative interpretation revealed that the area is intensely faulted with major anomalies faults trending in the northeast and. Onuoha department of geology, university of nigeria, nsukka, enugu state, nigeria. This page bundles the available data for the anambra basin in the africa. The coals in the anambra geographically and found throughout much of the basin outcrop mainly in enugu area where four mines. The formations encountered in the study area were deposited in the anambra basin as a result of marine transgression that occurred during. 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. Assessment of aeroradiometric data of southern anambra basin 745 kuforijimi, olorunsola. Biostratigraphy and paleoenvironment of the coniacian awgu. The study area is part of anambra basin, south eastern nigeria, which lies between longitude 7o00e 7o30e and latitude 6o00n 6o30n fig.
It was done by estimating the geographic extent of the basin s petroleum system in order to create the areal extent maps. The basin is bounded to the south by the niger delta basin hinge line. Accepted 23 august, 2010 structural analysis of joints and fault data obtained from exposures of the enugu and mamu formations. Assessment of hydrogeophysical and geotechnical properties in. Basin a is suspected to be the extension of the benue trough across the study area, while basin b is the anambra basin. 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. Anambra basin is one of the energyrich inland sedimentary basins in nigeria. 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. Palynofacies studies of sedimentary succession in ogbabu1. 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. Palynological and sequence stratigraphy characterization of the earlylate campanian nkporo shale, orekpekpeimiegba area, anambra basin, nigeria adebayo. Play fairway evaluation of the anambra basin, southeast nigeria.
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