Sedimentology and sequence stratigraphy of the nkporo group campanianmaastrichtian, anambra basin, nigeria. Stratigraphic setting sedimentation in the lower benue trough commenced with the marine neocomian albian asu river group. Lithofacies, palynofacies, and sequence stratigraphy of. Geologic setting and stratigraphy the geology of the anambra basin has been well studied and documented. Petroleum potentials of the nigerian benue trough and. 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 main oil source formations of the anambra basin, southeastern. The recent classification schemes are shown in table 1.
The study area is located in the southern part of anambra basin of southern nigeria as shown in figure 1 below. 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. The southern boundary of the anambra basin coincides with the northern section of the niger delta, with the basin as main precursor and the basin extends north wards beyond the benue river udo, 1970. Index map of niger delta and offshore nigeria showing the anambra basin and abakaliki fold belt after doust and omatsola, 1989.
Sequence stratigraphy of amansiodo1 well, anambra basin, southeast, nigeria 1m. Sequence stratigraphy, a branch of sedimentary stratigraphy, uses the order strata accumulated in along with a framework of major depositional and erosional surfaces to interpret the depositional setting of clastic and carbonate sediments from continental, marginal marine, basin margins and downslope settings of basins. The mamu formation consists of sandstones, shales and sandy shales with coal. The well log suites were displayed at consistent scales to enhance log trends and aid recognition of facies stacking patterns and parasequences. The shale unit in the mamu formation is the major source rock.
The anambra basin in the west of the lower region is more recent than the rest of the trough, being formed during a later period of compression, but is considered part of the formation. Sedimentary facies characterization and depositional. This author studied the depositional model of the outcrops along iseleazagbaonitshaakwa areas of the northern niger delta and anambra basins. Short and stauble, 1967 and nwajide, 2005 methods and materials outcrop sections of the enugu and the mamu formations were logged from the base to the top figs.
Subsurface evaluation of source rock and hydrocarbon potential of the anambra basin, south eastern nigeria iheanacho princewill ugochukwu dissertation. Anambra basin is one of the basins in nigeria, habouring the largest deposit of. Earlier work began with the investigation of tectonism in the southern nigeria. Anambra basin is one of the energyrich inland sedimentary basins in nigeria. The upper cretaceous strata of the southeastern nigerian basin appears to be a challenging target for stratigraphic and structural interpretation. Niger delta basin is located on the continental margin of the gulf of guinea in the equatorial west africa and lies between latitudes 4 o and 7 n and longitudes 3o and 9o e whiteman, 1982. The marginalshallow marine nkporo group is the basal lithostratigraphic unit of the late campanianmaastrichtian successions of the anambra basin, nigeria fig. Stratigraphy, tectonics, and basin evolution in the anza. Niger delta akataagbada petroleum system of9950h, chapter a.
Sedimentation in the anambra basin thus commenced with the early campanian early maastrichtian of the enugu and nkporo formations lateral equivalents which. The aspect of sequence stratigraphy requires more work for a more accurate definition of stratigraphic surfaces required for the establishment of. Basin wide stratigraphic correlation across the anambra basin using base of the mamu formation as a datum. Maastrichtian successions of the anambra basin, southeastern nigeria. Various works have been carried out in relation to the sequence stratigraphy of different parts of the niger delta. Thus, the stratigraphy can be regarded as both an integral component of the dynamic fault basin system, and a natural record, not always easy to read, of the tectonic processes that produced them. Sedimentology,sequence stratigraphy,anambra basin,nanka formation and eocene. The benue trough was formed by rifting of the central west african basement, beginning at the start of the cretaceous period. Dorsey the most beautiful thing we can experience is the mysterious. The stratigraphy and environment of deposition of sediments in the anambra basin southeastern nigeria after uzoegbu et al. Sequence stratigraphic interpretation had been carried out in parts of the anambra basin using data from three wells alo1 igbariam1 and ajire1. The stratigraphy of the anambra basin is summarized in. Geochemistry and geotechnical analysis of lateritic soils.
Kinematics of faults and joints at enugu area of the. The lithologic units of the succession are basically shales with ironstone intercalation showing a likely marine depositional environment. Structural, stratigraphic and combination traps on outcropping lithostratigraphic units of the anambra basin, southeast nigeria article pdf available. Aspects of hydrocarbon potential of the tertiary imo shale. Rock and hydrocarbon potential of the anambra basin, south eastern nigeria. The anambra basin is a sedimentary basin in south central part of nigeria that covers an area of 40,000sq. Biostratigraphy and paleoenvironment of the coniacian awgu. Paleoecology of enugu and mamu formations in anambra.
Stratigraphy, tectonics, and basin evolution in the anzaborrego desert region rebecca j. Sedimentology and sequence stratigraphy of the nkporo group campanian maastrichtian, anambra basin, nigeria haq et al. The study area lies within the anambra basin and it is made up of enugu shale, mamu formation, ajali sandstone, and nsukka formation. The aspect of sequence stratigraphy requires more work for a more accurate definition of stratigraphic surfaces required for the establishment of systems tracts and. During the santonian age, around 84 million years ago, the basin underwent intense compression and folding, forming over 100 anticlines and synclines. Controversy surrounding the stratigraphy of the anambra basin, depositional environments and conditions, and age of geologic formations present in the study basins were considered. Iountains, the san fernando valley, the southern foothills of the san gabriell\1ountains. Accepted 23 august, 2010 structural analysis of joints and fault data obtained from exposures of. Show full abstract properties of the upper cretaceous campanian to maastrichtian anambra basin, within a sequence stratigraphic framework, using wirelinelog data.
Geologic setting and stratigraphy the anambra basin is one of the cretaceous sedimentary basins 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. Sequence stratigraphic interpretation of late cretaceous. Most of the exposures of the lithofacies comprising the anambra sedimentary basin fill are exposed on the eastfacing scarp of the cuesta. Wireline logs and biofacies data from three exploratory wells s1, s2 and s3 were used for the study.
The anambra basin is situated west of the lower benue trough and is often considered youngest formation of the benue trough. Shallow marine clastics were deposited farther offshore and, in the anambra basin, are represented by the albiancenomanian asu river shale, cenomaniansantonian ezeuku and awgu shales, and campanianmaastrichtian nkporo shale, among others fig. Methods and materials selected outcrops of the ajali sandstone exposed in various parts of southeastern nigeria were studied. Several workers have studied the anambra basin and niger delta in terms of sedimentology, stratigraphy and sequence stratigraphic concepts nwajide and reijers 1996. The southern benue trough and anambra basin, southeastern nigeria. Four unconformitybounded thirdorder depositional sequences were identified. Geology and mineral resources of the lower benue trough. Accepted 23 august, 2010 structural analysis of joints and fault data obtained from exposures of the enugu and mamu formations. Application of seismic stratigraphy and structural analysis. 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 southern benue trough and anambra basin, southeastern. Post deformational sedimentation in the lower benue trough, therefore, constitutes the anambra basin. Geology and mineral resources of the lower benue trough, nigeria. Hydrocarbon generative potential of campanian source rock. Sedimentology and sequence stratigraphy of the eocene nanka. The deposits in the benue trough were displaced westwards at this time, causing subsidence of the anambra basin.
The neogene miocene to pleistocene stratigraphy of the western salton trough and imperial valley is. The identification of additional hydrocarbon reserves to buffer pressure from increasing energy demands in nigeria necessitated the application of sequence stratigraphic framework in the analysis of sedimentary successions in the central portion of southern anambra basin. Geophysical well logs and biostratigraphic data were integrated in order to identify key bounding surfaces, subdivide the sediment packages, correlate sand continuity and interpret the environment. Sedimentary facies characterization and depositional settings. Stratigraphy of the anambra basin after obohikuenobe et al.
Subsurface evaluation of source rock and hydrocarbon. To give a concise geological description of the outcrops. Biostratigraphic and well log analyses were used in the interpretation of the subsurface sequence stratigraphy of the area of interest in the anambra basin. Sequence stratigraphy and controls on sedimentation of the. Stratigraphy and sedimentology of the niger delta 7 during the middlelate eocene, sediment was deposited fig.
Anambraimo river basin development authority asked to. Pdf sedimentology and sequence stratigraphy of the. Stratigraphy of western nigeria offshore basin the stratigraphy of the eastern dahomey basin has been studied and discussed by various authors 1 11 14 20. Sedimentology and sequence stratigraphy of the nkporo. Outcropbased sequence stratigraphic analysis and palynological biofacies were used to define depositional sequences and their bounding surfaces, and build a sequence stratigraphic model for the upper cretaceous succession of the afikpo subbasin. Biostratigraphy and paleoenvironment of the coniacian. Previous studies in these formations centered mainly on the stratigraphy, biozonation, age dating, ichnology, paleoenvironmental and sequence stratigraphic interpretations e. Reservoir potential, environment of deposition, tectonic. Application of seismic stratigraphy and structural. Najime department of geology, ahmadu bello university, zaria nigeria abstract a sequence stratigraphic analysis was carried out on ditch cutting samples from amansiodo1 well, anambra basin nigeria. 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. It is located between longitudes 7 030 and 800 east and latitudes 6 026 and 630 north.
It extends northwestward into the niger valley, northward to the jos massif and northeastward into lafia. Petroleum potentials of the nigerian benue trough and anambra. Sedimentology and sequence stratigraphy of the nkporo group. Kinematics of faults and joints at enugu area of the anambra. 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. Field study the field study was a oneweek exercise and it involves an initial reconnaissance survey and then a detailed geological mapping of the study area. This study aimed at determining the geology and depositional environmental of these formations through field relationship and grain size. Sedimentology and sequence stratigraphy of the eocene. Paleoecology of enugu and mamu formations in anambra basin.
Application of seismic stratigraphy and structural analysis in the determination of petroleum plays within the eastern niger delta basin, nigeria, journal of petroleum exploration and production technology, 2015, pp. Anambra basin sedimentary basin sedimentary rock free. Paleoecology of the late campanian mid maastrichtian enugu and the mamu formations in the anambra basin, nigeria has not been properly handled. Location map of anambra basin showing the study area and the inset of map of nigeria after nwajide, 2006. Onuoha department of geology, university of nigeria, nsukka, enugu state, nigeria. Sedimentology and sequence stratigraphy of the nkporo group campanianmaastrichtian, anambra basin, nigeria by shirley o. Kinematics of faults and joints at enugu area of the anambra basin d. Dahomey embayment with indication of the study area. Pdf structural, stratigraphic and combination traps on.
The tectonic evolution, structures, sedimentation and stratigraphy of the anambra basin have been described by. Introduction this study examines part of the sedimentary units of the eocene nanka formation of anambra basin exposed at lat. Sequence stratigraphic interpretation of parts of anambra. This author studied the depositional model of the outcrops along isele azagbaonitshaakwa areas of the northern niger delta and anambra basins.
Subsurface evaluation of source rock and hydrocarbon potential of the anambra basin, south eastern nigeria. Summarized stratigraphy of the benue trough and anambra basin after reyment, 1965. Hydrocarbon generative potential of campanian source rock from ihube, anambra basin, nigeria. This study aimed at determining the geology and depositional environmental of these formations through field relationship and grain size distribution morphologic studies. Besides the differences in interpretation, the singleout crop approach adopted in the stratigraphic analysis of the nkporo group presented by nwajide and reijers 1996.
Pdf sedimentology and sequence stratigraphy of the nkporo. The basin is bounded to the south by the niger delta basin hinge line. Field study the field study was a oneweek exercise and it. Sequence stratigraphy of amansiodo1 well, anambra basin.
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