The sequence includes lower maastrichtian subbituminous coals in the anambra basin. The southern benue trough and anambra basin, southeastern nigeria. Petroleum potentials of the nigerian benue trough and. Appraisal of the economic geology of nigerian coal resources. Use of geochemical fossils as indicators of thermal. Petroleum potentials of the nigerian benue trough and anambra.
Now the angola basin extends north from the underwater walvis ridge, which runs to the west into the south atlantic from namibia, up to a second underwater barrier, the guinea ridge, which runs out in a westerly direction from cameroon. The stratigraphy of southern benue tough and anambra basin modified after umeji and nwajide, 2007. The total organic carbon toc and soluble organic matter som are in the range of 1. The deposits in the benue trough were displaced westwards at this time, causing subsidence of the anambra basin. Kinematics of faults and joints at enugu area of the anambra. Sedimentological characteristics of ajali sandstone at okigwe. The cross bedded sandstone is generally matrix free, fine to coarse grained and.
The crest of the cuesta is characterized by smoothly grassed inselbergs. It extends northwestward into the niger valley, northward to the jos massif and northeastward into lafia. Geology department, federal university of technology, minna, nigeria abstract geochemical studies have been carried out on coal samples from okaba odagbo in the anambra basin of nigeria to determine their geochemical characteristics and possible use as coking coal or otherwise. 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. Geologic setting and stratigraphy the geology of the anambra basin has been well studied and documented. It is 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. Department of geology, anambra state university, uli.
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 main objective was to simulate the hydrocarbon generation and expulsion in the nkporo source horizons encountered in igbariam1, iji1, and ajire1 wells drilled in the basin, using the onedimensional genesis zetaware basin modeling software. The main oil source formations of the anambra basin, southeastern nigeria. This study is a contribution to our understanding of the hydrocarbon potentials of the nkporo shale in the anambra basin, nigeria. According to 2,todays niger delta basin starts from idah and can be mapped. Obi department of geology, anambra state university, uli, nigeria abstract integration of sedimentologic and sequence stratigraphic interpretations of the nkporo group has provided the basis for a basin wide framework for prediction of potential. Depositional environment of siliciclastic deposits on the. A study of hydrocarbon generation and expulsion of the nkporo. Simpson 1954, reyment 1965, hogue and ezepue 1977 and ladipo 1986 have discussed the. Sedimentology and sequence stratigraphy of the eocene. Oil seepages have also been reported from parts of the basin. The geology is of interest to oil prospectors, hydrologists and palaeontologists. The geology of nigeria, as detailed in kogbe, is made up of three main rock.
Onuoha department of geology, university of nigeria, nsukka, enugu state, nigeria. Sedimentology and sequence stratigraphy of the nkporo group. Subsurface evaluation of source rock and hydrocarbon potential of the anambra basin, south eastern nigeria. Basin geology simple english wikipedia, the free encyclopedia. It is bounded to the west by the precambrian basement complex rocks of western nigeria, to the east by the abakaliki anticlinorium, and to the. With less than 50 wells so far drilled two discoveries. The main oil source formations of the anambra basin. 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. Geology of nigeria by kogbe pdf the gboko limestone, yandev, benue state, nigeria. Geology and mineral resources of the lower benue trough.
State, anambra basin, nigeria, is bounded by latitudes 60 49i 50. During the santonian age, around 84 million years ago, the basin underwent intense compression and folding, forming over 100 anticlines and synclines. Research article quality assessment of igaliwo and olokwu. The coal deposits discovered so far in nigeria are located mainly in the lower, middle and upper benue trough. Pdf sedimentological, palynological and foraminiferal. Controversy surrounding the stratigraphy of the anambra basin, depositional environments and. Such a model of continued and differential subsidence across the anambra basin would not only explain the variation in the patterns of the thicknesses, but also the lateral variation seen in the facies. Geochemical evaluation of okaba odagbo coal deposit.
Index map of niger delta and offshore nigeria showing the anambra basin and abakaliki fold belt after doust and omatsola, 1989. Accepted 23 august, 2010 structural analysis of joints and fault data obtained from exposures of. Most of the exposures of the lithofacies comprising the anambra sedimentary basin fill are exposed on the eastfacing scarp of the cuesta. The sedimentary structures ofumunya locality lies within the niger delta basin 2. It is accessible by motorable roads and footpath, especially those created by the villagers to fetch water from the pond. Anambra basin is one of the basins in nigeria, habouring the largest deposit of subbituminous coal and lignite. Geology and depositional environment of the ameki formation in parts of bende and environ southeastern nigeria chidera ikechukwu project report geography earth science geology, mineralogy, soil science publish your bachelors or masters thesis, dissertation, term paper or essay. The coal deposits of the anambra basin in the lower benue trough, located in southeastern nigeria contain the largest and most economically viable coal resources.
Now the angola basin extends north from the underwater walvis ridge, which runs to the west into the south atlantic from namibia, up to a second underwater barrier, the guinea ridge, which runs. Sedimentology and sequence stratigraphy of the nkporo. Geology and mineral resources of the lower benue trough, nigeria. The study area lies within the anambra basin of nigeria. Introduction this study examines part of the sedimentary units of the eocene nanka formation of anambra basin exposed at lat. The geology of nigeria is made up of three major lithopetrological components, namely, the basement complex.
Earlier work began with the investigation of tectonism in the southern nigeria. Basinwide stratigraphic correlation across the anambra basin using base of the mamu formation as a datum. This study was undertaken to study the hydrogeophysical properties of the geologic formations that underlie the southern anambra basin and to help in delineating. Sedimentation in the anambra basin commenced with the campanian.
The study area, amaekpu edda, lies entirely in the afikpo subbasin, a depression set up subsequently with the anambra basin after the epierogenic event which folded and uplifted the albiancenomanian sediments into the abakiliki anticlinorium. Organic geochemical studies and fossil molecules distribution results have been employed in characterizing subsurface sediments from some sections of anambra basin, southeastern nigeria. The area where this happened is called aptian salt, or angola basin. Geological map of the anambra basin and adjacent areas. Geology and petroleum potentials of santonian to moastrichtian sediments in the anambra basin, eastern nigeria. The anambra basin is situated west of the lower benue trough and is often considered youngest formation of the benue trough. Trace fossils from the campanian maastrichtian enugu formation. Depositional environments, organic richness, and petroleum. Basin wide stratigraphic correlation across the anambra basin using base of the mamu formation as a datum. Jun 16, 2019 geology of nigeria by kogbe pdf the gboko limestone, yandev, benue state, nigeria. Anambra basin sedimentary basin sedimentary rock free.
An overview of the geology and hydrogeology of nigeria. Anambra basin is one of the energyrich inland sedimentary basins in nigeria. Pdf petroleum potentials of the nigerian benue trough and. Depositional environment of siliciclastic deposits on the western. Agagu and ekweozor 1982 shows that the awgu and nkporo shales constitute the main source and seal rocks in the anambra basin. Agagu and ekweozor 1982 reported that the awgu and. Maastrichtian age has been recorded in the anambra basin. It is 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 anambra basin is situated at the southwestern extremity of the benue trough. Pdf the study area lies within the anambra basin and it is made up of enugu shale, mamu formation, ajali sandstone. Anambra basin showing the extension of ajali sandstone drawn from geological map of nigeria, gsn, 1994. The structural setting and general geology of the anambra basin have been documented by various workers reyment, 1965. The paleoenvironments, biostratigraphy and petroleum geology of the anambra basin have attracted the attention of many authors.
This study was undertaken to study the hydrogeophysical properties of the geologic formations that underlie the southern anambra basin and to help in delineating sites for drilling of productive boreholes in the area. To give a concise geological description of the outcrops. Sedimentary facies characterization and depositional settings of the. The study area, amaekpu edda, lies entirely in the afikpo sub basin, a depression set up subsequently with the anambra basin after the epierogenic event which folded and uplifted the albiancenomanian sediments into the abakiliki anticlinorium. Paleoecology of enugu and mamu formations in anambra basin. The anambra basin is a roughly triangular basin containing more than 5 km thick of sediments of varied lithologies. In the lower benue trough, lignite and subbituminous coals occur within the mamu formation middle campanian late. Summarized stratigraphy of the benue trough and anambra basin. The type of rocks which form there tell about the palaeoclimate of the continent. Anambra river1, ihadagu1 and very scanty 2d seismic information, anambra basin is under explored. This study aimed at determining the geology and depositional environmental of these formations through field relationship and grain size distribution morphologic studies. Pdf geology and depositional environment of campano. Subsurface evaluation of source rock and hydrocarbon. Kinematics of faults and joints at enugu area of the anambra basin d.
Extent and distribution of groundwater resources in parts of. The petroleum geology, biostratigraphy and paleoenvironmental description of anambra basin have been carried out by many authors. The matrix is composed poorly sorted, medium to coarsegrand, mudfree quartzose sand. Organic geochemical evaluation of the oilgasgenerative potential. Aug, 20 this study is a contribution to our understanding of the hydrocarbon potentials of the nkporo shale in the anambra basin, nigeria. Sedimentological, palynological and foraminiferal biostratigraphic studies of the upper cretaceous mamu formation at imiegba, anambra basin, edo state, nigeria article pdf available. Geologic framework the anambra basin is situated at the southwestern extrem ity of the benue trough. In exposed cretaceous deposits on a northwestsoutheast section from enugu to abakaliki, mean random vitrinite reflectance r o m in oil ranges from 0. Geological basins are one of the two most common places inland which collect sediment the other is lakes. Anambra basin, geology, depositional environment, mamu formation and ajali sandstone. Sedimentology,sequence stratigraphy,anambra basin,nanka formation and eocene. Hydrogeophysical investigation of southern anambra basin.
Everyday low prices and free delivery on eligible orders. Besides the differences in interpretation, the singleoutcrop approach adopted in the stratigraphic analysis of the nkporo group presented by nwajide and reijers 1996 did not permit determination of largescale stratigraphic distribution. Biostratigraphy and paleoenvironment of the coniacian. Geologic map of the study area inset is a map showing sedimentary basins. Agagu and adhigije 31 also reported a division of the anambra basin into southern onitsha basin and circular northern ankpa basin separated by the nwse trending nsukka high. The tectonic evolution, structures, sedimentation and stratigraphy of the anambra basin have been described by. Aspects of hydrocarbon potential of the tertiary imo shale. Geology and depositional environment of the ameki formation. Biostratigraphy and paleoenvironment of the coniacian awgu. Paleogeography, sedimentation and tectonics of the upper. Geology of amaekpu edda and environs, ebonyi state, nigeria. The study area lies within the anambra basin and it is made up of enugu shale, mamu formation, ajali sandstone, and nsukka formation.