Introduction a proper understanding of modern sedimentary environment is based mainly on three parameters which are their physical, chemical and biological characteristics. Petrographic studies and paleoenvironmental reconstruction of. O and goodluck i 1 1department of geoscience, university of lagos, akoka 2department of earth sciences, olabisi onabanjo university, agoiwoye, nigeria. It extends from the volta delta in ghana in the west to the okitipupa ridge in nigeria in the east whiteman. Nigeria is underlain by seven major sedimenta ry basins, viz. In the offshore benin basin drilling has dod2a seme 5 h2 h3 h4 h5 h7 h8 h9 mid. Aspects of source rock evaluation and diagenetic history of. A detailed understanding of the biostratigraphy of the dahomey basin in southwestern nigeria will broaden our knowledge of the basin which traversed different west african countries especially as nigeria is working towards increasing her petroleum output.
Heavy minerals and mineralogical composition of subsurface. The result was a significant discovery in the ogo prospect. The studied xformation is one of the paleocene strata bearing marine macrofossils. Geology and mineral resources of the lower benue trough, nigeria. Biostratigraphic studies of x and x boreholes,xformation. Nigerian association of petroleum explorationists bulletin, v. This basin contributes significantly to the water resources of nigeria and is also the major source of freshwater supply to various households. The paleocene early eocene foraminiferal biostratigraphy. Detailed fieldwork in parts of the benin dahomey basin sw, nigeria has allowed the recognition of sedimentary successions deposited in different continental depositional environments interpreted as fluvial sedimentation characterised by abandoned channels and subaerial exposure features. The paleoceneearly eocene foraminiferal biostratigraphy.
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. Source to reservoir correlation and hydrocarbon compositions. Biostratigraphic studies of x 1 and x 2 boreholes,xformation, dahomey basin nigeria. Hydrostratigraphic characterisation of shallow coastal. Department of applied geology, the federal university of technology, akure. The dahomey basin is a very extensive sedimentary basin that extends from southeastern ghana in the west to the western flank of niger delta in nigeria. Characterization of a bitumen seepage in eastern dahomey basin, sw, nigeria akinmosin a. The promise of deepwater dahomey basin africas premier.
The dahomey basin is an extensive sedimentary basin on the continental margin of the gulf of guinea. The geological map of the basin is presented in figure 2, showing the distribution of rock units within the basin. Source to reservoir correlation and hydrocarbon compositions of oil sand deposits in dahomey basin, nigeria saeed mohammed1, opuwari momonitu1, salam titinchi1, mohammed b. Done at niamey, on 25 november 1964 official texts. Deposits of heavy oil and natural bitumen have been longdiscovered in the dahomey basin southwestern nigeria. Ghana keta togo benin exploration basin report wood. Dahomey basin, provenance, heavy minerals, and mineralogical composition. Radio frequency dielectric properties of limestone and. 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. Geology and total petroleum systems of the gulf of guinea. Request pdf the dahomey basin the dahomey basin is a combination of inland coastal offshore basin that stretches from southeastern ghana through.
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. Lekoil commissioned a regional basin study and identified the dahomey basin block opl 310 as a key target. Sedimentary basins form primarily in convergent, divergent and transform settings. 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. 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. Pdf geology and petroleum systems of the offshore benin. This is an arcuate coastal basin, the onshore parts of which underlie the coastal plains of southwest nigeria, benin and togo. A faulted basement high, the okitipupa basement ridge separated the dahomey embayment from the benue trough until the late cretaceous subsidence and. Pdf seismic stratigraphy and development of avon canyon in. G background data and socioeconomic development aspects of onchocerciasis control in niger. The dahomey basin is a combination of inland coastal offshore basin that stretches from southeastern ghana.
Palynology and paleoenvironments of the upper araromi formation, dahomey basin, nigeria. Dahomey basin also called benin or keta basin in nigerian literature. 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 recent classification schemes are shown in table 1. Basin fill reaches up to 8km compared with an average of 3. This group is the thickest sedimentary unit within the basin. Onchocerciasis control programme in the volta river basin area. The paleocene early eocene foraminiferal biostratigraphy of. The bida basin the bida basin is a nwse trending intracratonic structure extending from kontagora in niger state in the north to the area slightly beyond lokoja in the south figure. The application of onedimensional 1d backstripping analysis was used to determine subsidence patterns in three offshore wells ayetoro 1, baba 1 and epiya 1 located in the nigeria sector of benin dahomey basin. Based mainly on available lithological, biostratigraphic and paleoenvironmental data, this paper summarizes the stratigraphic succession of theses basins and. Lekoils regional basin study covering the dahomey basin.
Characterization of a bitumen seepage in eastern dahomey. Depositional facies and sequence stratigraphic study in parts. It is separated from the niger delta by a subsurface basement high referred to as the okitipupa ridge. Generating value through new logging technology and analytical methods case study from offshore west africa. As the imprints of at least two major tectonic events are. 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 analysis of the sedimentary fills in a basin provides clues to the conditions prevalent during its evolutions. This paper summarizes the tectonosedimentary development and petroleum system of the offshore benin basin obb. Regional generalized stratigraphic setting of the eastern dahomey basin sw, nigeria the cutting of three different traverses to be worked on was done with the intention of opening the location for easy accessibility and then the profiles for the electrical resistivity was georeferenced using.
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. Geology and petroleum systems of the offshore benin basin. 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. The boreholes were drilled in the central part of the xformation, dahomey basin and was drilled up to the depth of 70ft. Abstract the akinbo formation comprises a sequence of mostly. Abstract the foraminiferal biostratigraphy of the paleocene early eocene strata of sw nigeria which represents the eastern dahomey basin has been studied from four boreholes and two outcrops. 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. However, inconsistency in estimates of volumes of hydrocarbon contained in these deposits has inhibited commercial interest in the deposits.
Adeniran ao 2015 principal component and cluster analyses of palynodebris from ajx well, offshore dahomey basin and their environmental significance. Subsidence patterns in the nigerian sector of benin dahomey. Dahomey embayment with indication of the study area. Psgenerating value through new logging technology and analytical methods case study from offshore west africa irewole j. Dahomey basin in the gulf of guinea modified from brownfield and chapentier, 2006. Geological map of dahomey basin in the nigerian sector and the states located on the basin 3. The stratigraphy of the sediments in the dahomey basin is controversial. Generally, the coastal plain sands and recent alluvium of the dahomey basin, south western nigeria, underlie the lagos area. Geology and mineral resources of the lower benue trough. Pdf palynology of the cretaceous succession of sile well. The dahomey basin is a very extensive sedimentary basin that extends from southeastern ghana in the west to the western flank of niger. The gbekebo borehole is located on the okitipupa ridge on the western flank of the niger delta.
The benin dahomey basin is one of the sedimentary basins located in the gulf of guinea oil province and straddles through four major countries, namely, ghana, the republic of benin, the federal republic of nigeria and the republic of togo figure 1. Groundwater prospecting using electrical resistivity new. Depositional facies and sequence stratigraphic study in. Palynology and paleoenvironments of the upper araromi. He reported that the imo shale represents a stratigraphic unit widely newly exposed section of the oshosun formation in the sagamu quarry, dahomey. Geology and petroleum systems of the offshore benin basin \benin\. Palynology of the cretaceous succession of sile well, offshore dahomey basin, benin republic. Tectonic extension at divergent boundaries where continental rifting is occurring can create a nascent ocean basin leading to either an ocean or the failure of the rift zone. Petrography and geochemical indices of the lagos lagoon. Petrographic studies and paleoenvironmental reconstruction. Basement exploration in kg basin the untouched frontier.
Interest in deepwater dahomey basin in nigeria has suffered majorly from four handicaps. Bida basin and to infer the hydrocarbon resource potentials of the basin. The araromi and gbekebo boreholes penetrated the cretaceous and tertiary strata while other two boreholes bh nos 4925 and. A detailed understanding of the biostratigraphy of the dahomey basin in southwestern nigeria will broaden our knowledge of the basin which traversed different west. Electrical resistivity tomography ert, induced polarization ip and borehole logging were carried in locations with relatively enhanced electrical.
The study area falls within the eastern part of dahomey basin and it is situated between latitude n06042 and 06045 and longitude e04018 and 04021 in the southwestern part of nigeria. Generating value through new logging technology and. The inconsistency is attributable to the little or no. 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. The marginal basins of the dahomey embayment formed at the culmination of late jurassic to early cretaceous tectonic activity that was characterized by both. 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. It is a transboundary basin that extends from ghana through togo and benin to nigeria. Cameroon, ivory coast, dahomey, guinea, agreement concerning. Eocene sections of the imo shale from the gbekebo1 well in the benin flank of the. Aspects of source rock evaluation and diagenetic history of the akinbo shale eastern dahomey basin, southwestern nigeria nton, matthew e ezeh, francis p. Geochemical and organic petrological study of bituminous. 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. Prerift stage up to late jurassic the prerift rocks in the dahomey embayment are represented by the lower part of the ise formation kogbe and mehes, 1986. 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.
Dahomey basin, southwestern nigeria is a wrench modified sedimentary basin containing rocks ranging in age from cretaceousrecent 14. Sedimentary succes sions in these basins are of middle mesozoic to recent age. Radio frequency dielectric properties of limestone and sandstone from ewekoro, eastern dahomey basin 1olatinsu o. 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. Cameroon, ivory coast, dahomey, guinea, upper volta, mali, niger, nigeria and chad agreement concerning the niger river commission and the navigation and transport on the river niger. 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.
Geology and total petroleum systems of the gulf of guinea province of west africa by michael e. With vast oil sand deposits in the dahomey basin, the exploration and exploitation of this resource will open new frontiers to complement nigerias hydrocarbon production from conventional plays. This basin is bounded by okitipupa ridge, which is the boundary it shares with niger delta basin 23. A background data and proposed rural development projects in upper volta. Previous geopotential attempts to study the basins were commonly restricted to a section of the basin e. The study area is located within the eastern part of dahomey basin between latitude 6o 40n to 6o 55n and longitude 3o 47n to 4o 19n accessible by major roads fig 1.
The benue trough is arbitrarily subdivided into three portions. The coastal plain and alluvium deposits of the eastern dahomey basin are characterised by a multilayer aquifer, which is classified into three types 16. Ghana keta togo benin exploration basin report summary the ghana keta togo benin ktb basin is part of the larger ktb basin which stretches across offshore and onshore nigeria, ghana, togo and benin in the gulf of guinea. In accordance with structural development, the stratigraphic succession of this basin was divided into 4 sequences.
These could be related to a number of features in the study area including its. The stratigraphic setting of the eastern dahomey basin in the southwestern nigeria was described as having five 5 lithostratigraphic formations. Palynological characterization of the tertiary offshore. Onchocerciasis control in the volta river basin area. The dahomey basin is a combination of inlandcoastaloffshore basin that stretches from southeastern ghana through togo and the republic of benin to southwestern nigeria. Basement exploration in kg basin the untouched frontier ashutosh shandilya, and tarun kumar summary kgpg basin has been established as a polycyclic intracratonic rift basin which hosts petroleum systems ranging from permian to pliocene and offers a target for aggressive exploration. The paleocene early eocene foraminiferal biostratigraphy of eastern dahomey basin, sw nigeria okosun, e.
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