Mar 19, 2020 anambra is a state in southeastern nigeria. Controversy surrounding the stratigraphy of the anambra basin, depositional environments and conditions, and age of geologic formations. Sedimentology and sequence stratigraphy of the nkporo. Trace fossils from the campanian maastrichtian enugu formation. This author studied the depositional model of the outcrops along iseleazagbaonitshaakwa areas of the northern niger delta and anambra basins.
Palynology, source rock potential and thermal maturity of. The anambra river flows 210 kilometres mi into the niger river and is found in anambra, nigeria. The states theme is light of the nation, formerly known as the home for all. 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. Anambra river1, ihadagu1 and very scanty 2d seismic information, anambra basin is under explored.
Obala nkpume na eti mkpili, oke mmili ndu, mmili ala naazu omambala, the mystic arteryvein of the dark race. Paleoecology of enugu and mamu formations in anambra basin. This page bundles the available data for the anambra basin in the africa. 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 the energyrich inland sedimentary basins in nigeria 153 it is a nearly triangular shaped embayment covering about 3000 km 2 with a total sedimentary thickness of approximately 9 km 2. The lithologic units of the succession are basically shales with ironstone intercalation showing a likely marine depositional environment. Peripatetic journalist extraordinary mcphee takes a close, lucid, resonant look at the modern scenery of the western us from the perspective offered by an understanding of geological processes. 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 palynological, organic petrographic, and organic geochemical analyses of the.
Biostratigraphy and paleoenvironment of the coniacian awgu formation in nzam1 well, anambra basin, southeastern nigeria. Anambra basin is one of the basins in nigeria, habouring the largest deposit of subbituminous coal and lignite. The oldest sediment in the anambra basin is nkporo group nwajide, 1990. Ladtpo department of geology and mlnera sciences university of llorln p.
The flow of the anambra river is released into the atlantic through various outlets forming the 25,000squarekilometre 9,700 sq mi niger delta region. Simpson 1954, reyment 1965, hogue and ezepue 1977 and ladipo 1986 have discussed the. The base of this zone is the same as the top of zone ii. Geology and mineral resources of nigeria request pdf. Nigeria finds oil and gas in commercial quantities in anambra. Geology and foraminifera analysis of ikem shale and its. Excitement as orient petroleum strikes oil in anambra. The southern benue trough and anambra basin, southeastern nigeria. Mr onwumere who led a team of experts to assess the volume of gas and crude reserves in the anambra river basin as well as gauge the preparedness of the state government in the establishment of an indigenous refinery through its oil company, orient petroleum resources, said the team was impressed with what it saw on the ground.
This study aimed at determining the geology and depositional environmental of these formations through field relationship and grain size distribution morphologic studies. Department of geology, anambra state university, uli. Sedimentological characteristics of ajali sandstone at okigwe. Nov 28, 20 this study is a contribution to the understanding of the play fairway in the anambra basin.
Onuoha department of geology, university of nigeria, nsukka, enugu state, nigeria. 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. Others such asnwajide 20 and obaje 2009 defined the anambra basin as distinct from the southern benue trough. It extends northwestward into the niger valley, northward to the jos massif and northeastward as far as lafia.
Prior to the orogeny, it was a proto basin covered by thin veneer of older sediments. The basin is a nwse trending embayment, perpendicular to the main axis of the benue trough and the niger delta basin fig. The elements of water budget equation were analyzed for the agulu lake area. It was done by estimating the geographic extent of the basins petroleum system in order to create the areal extent maps. Sedimentology and sequence stratigraphy of the eocene nanka. Introduction this study examines part of the sedimentary units of the eocene nanka formation of anambra basin exposed at lat. Paleogeography, sedimentation and tectonics of the upper. This project work was based on the biostratigraphy of the outcrop in enugu area in anambra basin, nigeriathe basin came into existence during the santonian orogeny. Kinematics of faults and joints at enugu area of the. Geologic map of the anambra basin adopted from babatunde o. This project area is within anambra basin, which is part of the benue trough.
Depositional environment of siliciclastic deposits on the western. The main oil source formations of the anambra basin, southeastern nigeria. Anambra basin has about 6,000 m of sedimentary rocks. 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.
The southern benue trough and anambra basin, southeastern. Biostratigraphy and paleoenvironment of the coniacian awgu. The anambra basin is about 40,000 km2 in size ogala, 2011 and is bounded to the west by the okitipupa ridge, in the east by abakaliki basin, and in the south by the niger delta basin fig. Accepted 23 august, 2010 structural analysis of joints and fault data obtained from exposures of the enugu and mamu formations. The basin is bounded to the south by the niger delta basin hinge line. Palynologiacal and paleoenvironmental investigation of the. It was deposited into the basin in late campanian, comprising nkporo shale, owelli sandstone and enugu shale reyment, 1965 and obi, 2001. The trough contains numerous subbasins including anambra basin. The marginalshallow marine nkporo group is the basal lithostratigraphic unit of the late campanianmaastrichtian successions of the anambra basin, nigeria fig. Textural characteristics of the siliciclasts of ajali. 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. Geological investigations has been carried out from most of the published work on the area and they are concentrated only on the regional geology. Controversy surrounding the stratigraphy of the anambra basin.
Anambra basin showing the extension of ajali sandstone drawn from geological map of nigeria, gsn, 1994. The total aeromagnetic data covering the study area was subjected to first vertical derivative, spectral depth analysis, and source parameter imaging spi. The river is the most important feeder of the river niger below lokoja. The basin is bounded to the south by the niger delta hinge line. The images are hyperlinks and will open up a separate window with a high resolution pdf image of the map. Subsurface evaluation of source rock and hydrocarbon potential of the anambra basin, south eastern nigeria iheanacho princewill ugochukwu dissertation. Water budget analysis of agulu lake in anambra state, nigeria. Nigeria is underlain by seven major sedimenta ry basins, viz. Oil seepages have also been reported from parts of the basin. Several workers have studied the anambra basin and niger delta in terms of sedimentology, stratigraphy and sequence stratigraphic concepts nwajide and reijers 1996. 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. It was deposited in early maastrichtian kogbe, 1989 and obi, 2000. Anambra basin is a cretaceous depocentre that received campanian to tertiary sediments nwajide, 1990 and obi, 2000.
To characterize the various depositional cycles and environments of the cretaceous successions through sedimentological and foraminifera paleontological study. To identify and characterize the various shale gas play within the anambra basin. Onitsha, a historic port city from precolonial times, has developed as by far the largest urban area in the state. The areal extent maps were generated using the reports of the stratigraphic subsurface horizons of amansiodo1, ihandiagu1, igbariam1, alo1, anambra river1, akukwa1, and nzam1. It was done by estimating the geographic extent of the basin s petroleum system in order to create the areal extent maps. Cretaceous sediments in the anambra basin, southeastern nigeria.
This is based on the age of the lithic fill of the benue trough which spans. Sedimentology and sequence stratigraphy of the eocene. The stratigraphic setting of southern nigeria comprises sediments of three major sedimentary cycles. The anambra basin is situated west of the lower benue trough and is often considered youngest formation of the benue trough. During the triassic, some 200 million years ago, northeastern new jersey was contiguous with northwestern africa. Depositional environments, organic richness, and petroleum. During the visit, the team also inspected the 20 kilometre access road to the oil wells and the 10 kilometre flow line for evacuating crude to a spot at anambra river basin from where evacuation. This name later came to be shortened to anam bra anambra, the name it officially. This could have introduced an accuracy which is beyond the original data.
The main oil source formations of the anambra basin. 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. 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. Sedimentary succes sions in these basins are of middle mesozoic to recent age. Download your complete project topics and materials. A sequence stratigraphic model for the group was developed by nwajide and reijers 1996, on the basis of stratigraphic analysis of a composite section located at leru, near okigwe. Subsurface evaluation of source rock and hydrocarbon. State, anambra basin, nigeria, is bounded by latitudes 60 49i 50.
The basin data is derived from a lower resolution grid which has been upsampled using gmt. The study area is located in the southern part of the anambra basin and covers about 2200 km 2. Anambraimo river basin development authority asked to. Sedimentology and sequence stratigraphy of the nkporo group. Sedimentological characteristics of ajali sandstone at. Pdf burial history analysis and subsidence in the anambra. Journal of environment and earth science issn 22243216 paper issn 22250948 online vol. The evolution of the benue trough began with the rise of a mantle plume under the present. Controversy surrounding the stratigraphy of the anambra basin, depositional. It extends northwestward into the niger valley, northward to the jos massif and northeastward into lafia.
The first two cycles belong to the presantonian sediments while the third cycle belongs to postsantonian sediments which are. The areal extent maps were generated using the reports of the stratigraphic subsurface horizons of amansiodo1, ihandiagu1, igbariam1, alo1, anambra river1, akukwa1, and. The anambra basin, located in southeastern nigeria, appears to contain the largest and most economically viable coal resources. Sedimentology,sequence stratigraphy,anambra basin,nanka formation and eocene. It is accessible by motorable roads and footpath, especially those created by the villagers to fetch water from the pond. The oban masif, southwestern nigeria basement craton and the cameroon basement complex also served as sources for the sediments of the anambra basin hoque and ezepue, 1977. Kinematics of faults and joints at enugu area of the anambra. The process began with the flag off of a graduate farmers employment scheme gfes at the anambra imo river basin development authority in agbala, owerri north local government area of imo state. Pdf paleoenvironmental reconstruction and hydrocarbon. The process began with the flag off of a graduate farmers employment scheme gfes at the anambraimo river basin development authority in. Play fairway evaluation of the anambra basin, southeast. Geology of amaekpu edda and environs, ebonyi state, nigeria. It is located between longitudes 7 030 and 800 east and latitudes 6 026 and 630 north. The afikpo subbasin is a coeval basin with the anambra basin, both lying unconformably on the santonian sediments of the.
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