Geology of dahomey basin pdf

Geology and total petroleum systems of the gulf of guinea. Geology and mineral resources of nigeria springerlink. Characterization of a bitumen seepage in eastern dahomey basin, sw, nigeria akinmosin a. Eastern dahomey basin in nigeria comprises two major inland river basins which include the ogunosun and beninowena river basin, with the addition of the coastal aquifer. The stratigraphy of the offshore benin basin was established later and considering lithological and paleontological similarities with formations of various southern nigeria basins, the stratigraphic chart adopted for this basin was a mixed variant of various southern nigerian basins nomenclatures. This paper summarizes the tectonosedimentary development and petroleum system of the offshore benin basin obb.

Geology and stratigraphy the dahomey basin is an extensive sedimentary basin on the continental margin of the gulf of guinea. Amelina 0 0 beninese company of hydrocarbon cbh 01 bp 8060 cotonou, benin 1 university of abomeycalavi, 01 bp 526 cotonou, benin geology and petroleum systems of the offshore benin basin benin this paper. Coastal plain sands in some selected areas of ikoyi, in lagos, dahomey basin southwestern nigeria have been investigated with respect to their geotechnical properties to determine their suitability as construction materials and to recommend suitable. The dahomey basin, sw nigeria, hosts a 3000mthick sedimentary succession of cretaceous and cenozoic age, of which the turonianmaastrichtian afowo formation includes sandstones, arkoses, shales, shelly limestones, unconsolidated sand, clay and most importantly, bituminous tar sand strata. The formations of the eastern dahomey basin are not an exception.

The dahomey basin is a very extensive sedimentary basin that extends from. Apr 30, 2009 the iullemmeden basin in northwestern nigeria is known locally as the sokoto basin. Part 3 presents the mineral resources of nigeria, their geological environment, mode of occurrence, localities and where possible their estimated reserves. In the republic of benin, the geology is fairly well known billman, 1976. Petrography and geochemical indices of the lagos lagoon.

Located to the northeast of benin and extending to southwest of niger, the kandi basin is part of a set of west african basins weakly subsident. Geology of the nigerian sedimentary basin sensu lato introduction. P basin a u l f z r o m a n c h e f r a c t u r e z o n e c h a i n f r a c t u r e z o n e gulf of guinea volta basin 5 0 100 5 00 50 0 0n n w w e 0 200 400 km country boundary fracture zone sedimentary basin figure 1. Location of dahomey basin in the gulf of guinea area of west africa, b. Geological survey petroleum geology of the santa maria basin assessment province, california for the 1987 national assessment of undiscovered oil and gas resources by caroline m. General geological framework of dahomey basin after 3 2. Generalized stratigraphic column showing age, lithology, and sequence of the formations and tectonic stage of basin development in the nigerian sector of the benin basin 3. Geological map of dahomey basin in the nigerian sector and the states located on the basin modified after 1. Geology and total petroleum systems of the gulf of guinea province of west africa by michael e. The dahomey basin, also called the dahomey embayment, benin basin, or west nigerian basin in older literature, extends from southeastern ghana in the west, through southern togo and southern benin republic formerly dahomey to. The dahomey basin is an amalgamation of inlandcoastaloffshore basin that expanses from southeastern ghana through togo and the republic of benin to southwestern nigeria. Department of geology, federal university of technology, minna, nigeria. The paleoceneearly eocene foraminiferal biostratigraphy.

Feb 23, 20 however, agagu 1985 placed together the stratigraphy of eastern dahomey basin from surface as well as subsurface data, deciphering that in most part of the basin, the stratigraphy is dominated. In accordance with structural development, the stratigraphic succession of this basin was divided into 4 sequences. Geological survey of nigeria agency has played an active role in the exploration for mineral deposits in nigeria. U department of earth sciences, olabisi onabanjo university, agoiwoye department of geology university of ibadan email of corresponding author. Geological cross sections were constructed to deduce. Conducting properties of the subsurface having anomalous values are a concern. Geology and mineral resources of the lower benue trough. Department of geosciences, akwa ibom state university, ikot akpaden, mkpat enin lga,nigeria.

Petrographic studies and paleoenvironmental reconstruction. Biostratigraphic studies of x 1 and x 2 boreholes,xformation, dahomey basin nigeria. However, inconsistency in estimates of volumes of hydrocarbon contained in these deposits has inhibited commercial interest in the deposits. Apr 30, 2009 the dahomey basin is a combination of inland coastal offshore basin that stretches from southeastern ghana through togo and the republic of benin to southwestern nigeria. Characterization of a bitumen seepage in eastern dahomey. B 5363, ado, ekiti state, nigeria the cretaceous sediments of dahomey basin are partly cut off from the sediment of niger delta basin again supported ages assigned to the sequences, ewekoroakinbo and other tertiary formations range in age from paleocenemiddle to upper eocene and the sediments are. This basin contributes significantly to the water resources of nigeria and is also the major source of freshwater supply to various households. Deposits of heavy oil and natural bitumen have been longdiscovered in the dahomey basin southwestern nigeria. It extends from south eastern ghana through togo and benin republic into western nigeria slansky, 1962, antolini 1968, billman 1972. Stratigraphy, tectonics, and basin evolution in the anza. Abstract the palynofacies study carried out on offshore ditch cuttings from ajx well in dahomey basin revealed different types of palynodebris. Geology and ore deposits of the sultan basin, snohomish. Most of the wells that penetrated the basement are in the eastern dahomey embayment of western nigeria. The dahomey basin is a combination of inland coastal offshore basin that stretches from southeastern ghana through togo and the republic of benin to southwestern nigeria.

The principal source rocks for petroleum generation in the dahomey basin, southwestern. A maximum thickness of about 12,000 m of sedimentary rocks is attained in the offshore western niger delta, but maximum thicknesses of sedimentary rocks are about 2,000 m in the chad basin and only 500 m in the sokoto embayment. Insitu and laboratory determination of thermal properties of tar sands in eastern dahomey basin southwestern nigeria oladunjoye m. Dahomey basin in the gulf of guinea modified from brownfield and chapentier, 2006. Foraminifera biostratigraphy and depositional environment of. Nigeria comprise the anambra and dahomey basins in the south, the lower, middle and upper benue trough, the chad bornu basin in the ne, the bida basin, and. Basement geology in the sedimentary basins of nigeria. The boreholes were drilled in the central part of the xformation, dahomey basin and was drilled up to the depth of 70ft. The basin is a marginal pullapart basin klemme, 1975 which developed in the. Lekoil commissioned a regional basin study and identified the dahomey basin block opl 310 as a key target. Part 1 discusses the geology of the crystalline rocks and their regional distribution while the sedimentary basins constitute the subject of part 2. Michael gardosh head of geology and geophysics department ministry of energy. Geology and petroleum systems of the offshore benin basin benin c. Nigeria comprise the anambra basin, the dahomey basin, the lower, middle and upper benue trough, the chad basin, the bida basin, and the sokoto basin.

Generally, the coastal plain sands and recent alluvium of the dahomey basin, south western nigeria, underlie the lagos area. The identified formations earth layers are as presented in table 1. This study employed electrical resistivity tomography ert in characterising the shallow groundwater aquifers of eastern dahomey basin in southwestern nigeria to assess the possible occurrence and distribution of saltwater within the aquifers. Geology and petroleum systems of the offshore benin basin \benin\. Department of mineral resources engineering, federal polytechnic, ado ekiti.

The geology of the basin has been extensively discussed by various authors murat. Geology and mineral resources of the lower benue trough, nigeria. The oldest unit in dahomey basin is abeokuta group 6 which lies unconformably on the crystalline basement complex of. The dahomey basin is an extensive sedimentary basin, in the gulf of guinea which extends. The geology of nigeria as described by obaje 1, comprises.

Depositional facies and sequence stratigraphic study in. Depositional environments and reservoir potential assessment of the ewekoro formation, eastern dahomey basin, southwestern nigeria. The benin dahomey basin forms one of a series of west african atlantic margin basins. Geochemical and organic petrological study of bituminous. Based mainly on available lithological, biostratigraphic and paleoenvironmental data, this paper summarizes the stratigraphic succession of theses basins and. The recent classification schemes are shown in table 1. Biostratigraphic studies of x and x boreholes,xformation. Geological map of dahomey basin in the nigerian sector and the states located on the basin 3. Pdf geology and total petroleum systems of the gulf of. The petroleum geology and prospectivity of the neo. The mineralogical analysis revealed an average of 95. A faulted basement high, the okitipupa basement ridge separated the dahomey embayment from the benue trough until the late.

Heavy minerals and mineralogical composition of subsurface. Jun 16, 2019 geology of nigeria by kogbe pdf the gboko limestone, yandev, benue state, nigeria. Some geologic reports have been published that cover part of the area adjacent to, or near, the basin, and following is a selected list of publications that give data pertinent to the area studied. The cretaceous stratigraphy of the eastern dahomey embayment based on boreholes and outcrops in. Geology and mineral resources of nigeria nuhu george. Petrography and geochemical appraisal of afowo sandstone facies, dahomey basin, southwestern nigeria ikhane p. O and goodluck i 1 1department of geoscience, university of lagos, akoka 2department of earth sciences, olabisi onabanjo university, agoiwoye, nigeria.

Depositional facies and sequence stratigraphic study in parts. Dahomey developed on the abomey plateau amongst the fon people in the early 17th century and became a regional power in the 18th century by conquering key cities on the atlantic coast. For much of the 18th and 19th centuries, the kingdom of dahomey was a key regional state, eventually ending tributary status to the oyo empire. The sokoto basin nigerian sector of the iullemmeden basin. This plain is occasionally interrupted by low mesas. Contains details on the geological units of nigeria and the associated mineral resources. Broadhead, new mexico bureau of geology and mineral resources, a division of new mexico institute of mining and technology introduction the oil and natural gas that are produced from oil and gas fields reside in porous.

Omatsola and adegoke 1981 on the lithostratigraphy of dahomey basin recognized 3 formations belonging to the abeokuta group based on lithologic homogeneity and similarity of origin. The marginal basins of the dahomey embayment formed at the culmination of late jurassic to early cretaceous tectonic activity that was characterized by both. Dahomey embayment benin basin keta basin tano basin s a l t p o nd a n d c e n t r a l b a s i s ivory coast s t. Neoproterozoic, paleozoic and cretaceous sedimentary basins in ghana gerald wemazenu adda1. The studies conducted in this basin includes exploration for petroleum by oil companies 19541961 which led to the drilling of bodashe1 well, illepaw 1 well, afowo1 well and ojo19 well fayose, 1970. The depositional environments and provenance characteristics. Geology and mineral resources of the lower benue trough, nigeria 1fatoye f.

Nigeria is underlain by seven major sedimenta ry basins, viz. The sediments are of maastrichtian age deposited in the shallow marine environment with varying thicknesses. In the togo and benin regions, the following rock types have been identified. Department of applied geology, the federal university of technology, akure. Hydrostratigraphic characterisation of shallow coastal. The studied xformation is one of the paleocene strata bearing marine macrofossils. Rockeval data of forty seven 40 shales give total organic. The province includes the ivory coast, tano, central, saltpond, keta, and benin basins and the dahomey embayment. Heavy minerals and mineralogical composition of subsurface coastal plain clastic deposits of eastern dahomey basin, southwestern nigeria. The benin and western nigeria offshore basins, which are parts of an extensive basin called the dahomey benin embayment, were formed during the early cretaceous under similar tectonic conditions and continental sedimentary environments.

Regional geologic setting and stratigraphy the benin dahomey basin constituting part of a system of west african pericratonic margin sag basin. The dahomey basin the dahomey basin is a combination of inlandcoastaloffshore basin that stretches from southeastern ghana through togo and the republic of benin to southwestern nigeria. Stratigraphy, tectonics, and basin evolution in the anzaborrego desert region rebecca j. To assess the pattern of distribution of the palynofacies types, their abundances were submitted. Other subsequent workers recognized three chronostratigraphic units. Drilled core samples of the araromi formation in the eastern dahomey basin penetrated by araromi and gbekebo exploratory wells were investigated to establish the source rocks potentials in the onshore area of the basin. Dorsey the most beautiful thing we can experience is the mysterious. It consists predominantly of a gently undulating plain with an average elevation varying from 250 to 400 m above sealevel. Geological map of dahomey basin showing the location of the araromi and gbekebo wells red box on the eastern margin of dahomey west of the niger delta. The dahomey basin is a very extensive sedimentary basin that extends from southeastern ghana in the west. The assessment of potential source rocks of maastrichtian araromi. The coastal plain and alluvium deposits of the eastern dahomey basin are characterised by a multilayer aquifer, which is classified into three types 16. A faulted basement high, the okitipupa basement ridge separated the dahomey embayment from the benue trough until the late cretaceous subsidence and.

Webb2 1department of earth sciences, syracuse university, syracuse, new york 244. Revised manuscript received and accepted october 24, 20. Adekeye department of geology and mineral sciences, university of ilorin, ilorin, nigeria. Electrical resistivity tomography ert, induced polarization ip and borehole logging were carried in locations with relatively enhanced electrical. Part 3 takes the mineral resources of nigeria one on one, their geological environment, mode of occurrence, localities. Geology of dahomey basin the dahomey basin is one of the sedimentary basins on the continental margin of the gulf of guinea, extending from. Groundwater prospecting using electrical resistivity new.

Pdf seismic stratigraphy and development of avon canyon in. The result was a significant discovery in the ogo prospect. The cretaceous abeokuta group is the oldest and the thickest group of sediment in the dahomey basin. Biostratigraphic and geochemical evidence for the link with the emerging cenomanian coniacian petroleum system in the gulf of guinea. The assessment of potential source rocks of maastrichtian. Albert einstein introduction the fossil record of past life is commonly preserved in ancient sediments and sedimentary rocks. 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. Geology and petroleum systems of the offshore benin basin. It is separated from the niger delta by a subsurface basement high referred to as the okitipupa ridge.

The geology of benin in west africa includes the northnortheast trending proterozoic dahomeyide orogen in the north and a range of cretaceous to holocene sedimentary rocks in the south, separated very closely by the 7th latitude. Bonaparte basin in the onshore bonaparte basin, significant petroleum exploration commenced in the 1960s and intensified in the 1970s following the discovery of numerous oil and bitumen shows in shallow mineral exploration core holes drilled near the basin margin. This group is the thickest sedimentary unit within the basin. The geology of benin in west africa includes the northnortheast trending proterozoic dahomeyide orogen in the north and a range of cretaceous to holocene sedimentary rocks in the south, separated very closely by the 7th latitude 42 neogene alluvial deposits extend across benins northeastern border with niger. The geological map of the basin is presented in figure 2, showing the distribution of rock units within the basin. However, these inland basins have continued to frustrate the efforts of many explorers, principally because of the poor knowledge of their geology and. The dahomey basin is a very extensive sedimentary basin that extends from southeastern ghana in the west to the western flank of niger. Sedimentary succes sions in these basins are of middle mesozoic to recent age. This is an arcuate coastal basin, the onshore parts of which underlie the coastal plains of southwest nigeria, benin and togo.

The dahomey basin is a combination of inland coastal offshore basin that stretches from southeastern. Dahomey embayment with indication of the study area. Interpretation of a grid of high resolution seismic profiles from the offshore eastern part of the benin dahomey basin in southwestern nigeria area permitted the identification of cyclic events of cut and fill associated with the avon canyon. The stratigraphy of the eastern dahomey basin has been studied and discussed by various authors 1 11.