The niger delta started to evolve in early tertiary times when clastic river input increased doust and omatsola, 1989. Brief geology of study area the niger delta basin occupies the gulf of guinea continental margin in equatorial west africa, between latitudes 3o and 6on and longs, 5o and 8oe. Niger delta, biostratigraphy, sedimentology, megasequences, cycles 1. Oil and gas in the niger delta are primarily produced from. Udoh 1,2department of geology, university of port harcourt, port harcourt, nigeria. An overview of the geology and hydrogeology of nigeria. The niger delta has a long history of violent conflicts over environmental. Structural and seismic facies interpretation of fabi field. It is typically considered to be located within nine coastal southern nigerian states, which include. The niger delta basin is situated in the gulf of guinea in equatorial west africa, between latitudes 30n and 60n and longitudes 50e and 80e reijers et al, 1996 fig. From a panoramicview across the onitshaenugu express way, the lenticular umunya section is observed to comprise three subunits. In this work, we determined the geomechanical properties of a typical hydrocarbon well within the niger delta basin using geophysical well logs.
The niger delta forms one of the worlds major hydrocarbon provinces and it is situated on the gulf of guinea on the west coast of africa southern part of nigeria. The niger delta the nigerdelta area of nigeria coincides approximately to the southsouth geopolitical zone of the country fig i. The niger delta is the delta of the niger river sitting directly on the gulf of guinea on the atlantic ocean in nigeria. In contrast, the distribution of field sizes in the niger delta is uniform. The basin is deformed by large synsedimentaty faults, roll. The hydrocarbon reservoirs in this study were found to be in the agbada formation, which is in conformity with the geology of the niger delta, nigeria. The geology of niger comprises very ancient igneous and metamorphic crystalline basement rocks in the west, more than 2. A recently computed fit of the african and south american continents is astonishingly close, apart from an overlap of some 120 miles in the vicinity of the niger delta. Reservoir characterization in o field in the niger delta. The influx of people into the niger delta air pollution and health waste management and health impacts on culture, traditions and authority structures the history of environmental management in the niger delta conclusion chapter four. Niger delta humiliation and serious manhandling in the hands of nigeria police and allied group at moore police station ile ife, osun state by dr abiodun olabanjo. Delta construction proceeded in discrete minibasins ranging in tectonic configuration from extensional, through translational to compressional toethrust regions. The southern nigeria sedimentary basin includes the lagososse and the niger delta. One of the worlds largest deltas, the immense coastal.
The analysis was based on a combination of data sets including logs of six wells to describe lithic variations of the agbada formation within the ab field. Estimation of reservoir potentials of two wells in niger. The niger delta is a low gradient delta plainshelf slope wedge with an estimated area. Niger delta, oil wealth, ethnic militia, content analysis, corporate. Geology of the niger delta the niger delta is an oil province of nigeria located on the west african continental margin. Petroleum geology of the niger delta is described in evamy et al.
Midlower miocene agbada sedimentary intercalations of ab field in the coastal swamp depobelt, western nigerdelta, were evaluated to determine their sequence stratigraphic character. Surface geology shown on the african plate, major cretaceous rift basins and breakup direction shown. Mar, 2015 detailed studies on depositional sequence, genetic facies, and depositional environment were done using sequence stratigraphic tool in the paralic sequence of middle to late miocene age in the coastal swamp depobelt of the niger delta basin. This basin is very complex, and it carries high economic value as it contains a very. Pdf the niger delta, an area of roughly 30000km 2, is experiencing physical development challenges due to poor soil conditions, a situation. Geotechnical attributes of niger delta soils, warri environs, nigeria oghonyon rorome1, adeniran adedoyin a2 3and opaimi iniala 1,2,3department of geology, university of port harcourt, port harcourt, nigeria. The causes, effects and potential solutions to the deep. Potential hydrocarbon regions in the southern region of the niger delta basin of nigeria have been identified from gravity and magnetic data. During the cenozoic, until the middle miocene, the niger delta grew through pulses of sedimentation over an oceanwarddipping continental basement into the gulf of guinea. This was aimed at increasing the resolution for prediction of reservoir, seal, and source rocks in the eastern part of the basin. S1 abstract the niger delta, an area of roughly 30,000km2, is experiencing physical development challenges due to poor soil conditions, a situation which has escalated project cost and as a consequence impeded development. There, as well as in the onshore part of the delta, the traditional lithostratigraphic subdivision of the cenozoic niger delta section. Oil exploration and poverty in the niger delta region of. The area is characterized by a mosaic of floodplain deposits and.
The niger delta fold and thrust belts occupy the outboard toe of the delta in figure 1. It has an aerial extent of 75,000 km 2 and a total estimated area of 300,000 km 2. The niger delta region in the light of the theory of. Apart from middle east, which has a long historiography of interminable crises, the niger delta region, ndr, is the most studied region of the world. The depositional environments, and corresponding sedimentary facies, are distributed concentrically within the deltaic region. Volumetric and material balance methods of reserve.
Formations in niger delta area, nigeria short and stauble, 1967. Both structural and stratigraphy traps are common in the basin doust and omatsola, 1990. Assessing wetland services in the niger delta, nigeria. Niger delta province, nigeria, cameroon, and equatorial guinea, africa. Petrophysical evaluation and volumetric estimation within.
Clays from the recent delta have similar mineralogical compositions. The niger delta region comprises abia, akwa ibom, bayelsa, cross river, delta, edo, imo, ondo, and rivers states. The niger delta basin, also referred to as the niger delta province, is an extensional rift basin. Formation evaluation of an onshore oil field, niger delta. In other words, the niger delta includes the states of abia, akwa ibom, bayelsa, cross river, delta, edo, imo, ondo and rivers. The devastating effects of environmental degradation a case study of the niger delta region of nigeria fig working week 2009 surveyors key role in accelerated development eilat, israel, 38 may, 2009 214 the devastating effects of environmental degradation a case study of the niger delta region of nigeria angela kesiena etuonovbe, nigeria 1. Global journal of geological sciences african journals online. Jul 30, 2007 the size and distribution of niger delta fields is remarkable.
Today, the delta is covered with a dense grid of 2d and 3d seismic data and it has been penetrated by more than 5,000 wells. Mineralogical studies of tertiary subsurface sediments in the niger delta have shown that smectite, kaolinite, mixed. Pdf determination of geomechanical properties of a. Geomechanical properties we estimated using acoustic velocities derived from interval transit time which. Foraminifera biostratigraphy and paleoenvironment of well. Assessment of undiscovered petroleum in the tertiary niger delta akataagbada petroleum system no. Integrated reservoir quality study of deepwater clastic.
Map of the offshore niger delta showing the location of regional transects 110 used in this study, bathymetry, and major offshore structural provinces modified from connors et al. Many nigerians perceive the niger delta as synonymous with the oil producing areas of nigeria. Sequence stratigraphy and depositional environments of middle. It is not surprising that there is a repertoire of literature covering the various epochs of the region. Niger delta by 1 while 3 reported a geothermal gradient range of 1. Its development began after the eocene tectonic phase. The devastating effects of environmental degradation a case. The niger delta sofiri peterside patterson ogon one of the great deltaic regions in the world, the niger delta is a vast sedimentary basin constructed over time through successive thick layers of sediments dating back 4050 million years to the eocene epoch.
The structure of the offshore niger delta tional accommodation on the slope in the inner fold and thrust belt, as well as distal contraction in the outer fold and thrust belt. The benin formation is the topmost lithostratigraphy and it is a continental deltaic sands. Structural and stratigraphic mapping of delta field, agbada. The niger delta petroleum system usgs publications repository. The modern niger delta exemplifies a type of delta in which sand as well as mud is supplied to a receiving water body of high energy. An estimate of oil window in nigeria niger delta basin from. Stratigraphy and sedimentology of the niger delta in.
How nigerias environmental laws are failing the niger delta in a nation that the leaders do not believe in environmental protection, the concept of sustainable development is an illusion. Delta field, niger delta, integration, stratigraphic mapping, structural interpretation, well logs. Structural interpretation of seismic data from an xy field. The region is blessed with abundance of human and physical resources, including the majority of nigerias oil and. Psintegrated reservoir quality study of deepwater clastic deposits, offshore western niger delta, nigeria c. From eocene to the present, the delta has prograded southwestward, forming depobelts that represent the most active portion of the delta at each stage of its development 9. Pdf analysis of deforestation pattern in the niger delta. Structural and seismic facies interpretation of fabi field, onshore niger delta, nigeria kehinde oluwatoyin olowoyo dissertation. Northern delta, greater ughelli, central swamp, and coastal swamp and offshore depobelts. Nwajide introduction the niger delta basin occupies the gulf of guinea continental margin in equatorial west africa, between lats.
The niger delta was formed as a result of the african and south american plate, at the site of the triple junction in the late jurassic and continuing into the cretaceous, thus leading to the opening of the southern atlantic. Petroleum geology of the niger delta geological society, london. Analysis of deforestation pattern in the niger delta region of nigeria article pdf available in journal of land use science october 2014 with 1,409 reads how we measure reads. The region is the most blessed deltas in the world, in both human and material resources but the unfavorable manner in which these resources are harnessed overtime, is the bane of the regions predicament. The delta grossly consists of three subsurface lithostratigraphic unitsthe marine akata shales, the paralic agbada formation, and the continental benin.
Deepwater niger delta fold authors and thrust belt. It lies in the south western part of the benue trough, which is a much bigger tectonic. The niger delta basin is characterized with shale diapirs, growth faults and associated rollover anticlines. Niger delta geographical region, africa britannica. The niger delta is one of the worlds largest tertiary delta systems and an extremely. In most other oil provinces, there is a noticeable skewness in the distribution of field sizes, e. British shipping had been paramount there when the british slave trade had been abolished in 1807, and the merchants of the delta citystates had quickly adapted themselves to offering palm oil as an alternative export to slaves. Summary of the geology of the study area the studied area is located in parts of the onshore zone in the niger delta sedimentary basin, nigeria fig.
This paper attempts to determine whether there is a genuine misfit at this point or whether the delta may have grown beyond the continental margin after the continents separated. The niger delta system figure 1 is one of the worlds largest tertiary deltas and one of its most prolific hydrocarbon systems, containing an estimated 68 bboe and producing approximately 3 mmboe per day. Pdf an overview of the geology and hydrogeology of nigeria. The niger delta underlies an area of about 256,000 km 2, and was initially built over an older transgressive paleocene prodelta. Geology of niger delta petroleum reservoir petroleum. It is the most important in the west african continental margin. Figure 2 is a 275 km, prestack depth migrated and interpreted seismic line across the offshore niger delta that extends from the shelf to the basin floor. Midlower miocene agbada sedimentary intercalations of ab field in the coastal swamp depobelt, western niger delta, were evaluated to determine their sequence stratigraphic character. The volta basin, air massif and the iullemeden basin began to form in the neoproterozoic and paleozoic, along with numerous ring complexes, as the region experienced events such as. The researcher found that the bulk of the hydrocarbon encountered in the niger delta basin was found to be within a depth range of 5,473,381 ft 1,668.
Stratigraphy and sedimentology of the niger delta 7 during the middlelate eocene, sediment was deposited fig. Rahaman preliminary report on the field relationships of the basement complex rocks around igarra, midwest i. Reservoir description and characterization of eni field. Nigerias niger delta region is not only home to the greater part of africas largest.
The study area is located within the northern depobelt of the niger delta sedimentary basin fig. The thickness of the basin ranges between 1012km and it is. The niger delta, an area of roughly 30,000km 2, is experiencing physical development challenges due to poor soil conditions, a situation which has escalated project cost and as a consequence. As a step towards understanding this geohistory, this study examines the stratigraphy and sedimentary structures of the umunya section of the eocene nanka. Petrophysical evaluation of uzek well using well log and. Reservoir geology and sequence stratigraphy of deep water sediments, offshore depobelt, niger delta, nigeria matthew o. The niger delta basin, also referred to as the niger delta province, is an extensional rift basin located in the niger delta and the gulf of guinea on the passive continental margin near the western coast of nigeria with suspected or proven access to cameroon, equatorial guinea and sao tome and principe. Abstract the study of geotechnical index properties of soils in warri, delta state was carried out to determine. It ranks among the worlds most prolific petroleumproducing tertiary deltas, and has been rated sixth. Georger joined the petrolin group switzerland in 1995 and is responsible for all crude oil trading activities, including the. Introduction the niger delta is ranked among the worlds major hydrocarbon provinces in the world. Jacobbergerh accepted 28 january 1986 remote sensing and field mapping formed the basis for a morphological study of the upper inland niger delta, centered on the region surrounding jenne and mopti, mali.
Abstract in the niger delta province, we have identified one petroleum systemthe tertiary niger delta akataagbada petroleum system. The niger delta basin has area coverage of about 75,000 km 2 and consists of an overall regressive clastic sequence which reaches a maximum thickness of about 12,000 m in the central part of the basin where there is maximum subsidence merki 1972. Little work has been done in this section to ascertain its geology. Pdf engineering geology of the niger delta researchgate. Stratigraphy and sedimentology of the niger delta geologos. Generally the delta prograded over the subsidizing continentaloceanic lithospheric transition zone, and during the oligocene spread onto oceanic crust of the gulf of guinea adesida et al. From the eocene to the present, the delta has prograded southwestward, forming depobelts that represent the most active portion of the delta at each stage of its development doust and omatsola, 1990. Delta utue ologbo yorla mina ebisan os soku awodi ruta bonga sw bonga nw kaka keh hi hj s akarino okpa hobobo jk ab on rth ofrima kuro egbeleke epiya bolia rob i sonam azama erukuku chioma madu oma shokoloko asanga okpok npete egina ewo engule og ed h akpo ton r h al bilabri adaka ejigebede gba du ikija aparo opl 249 doro matu chota anyala. Niger delta akataagbada petroleum system of9950h, chapter a. The onshore portion of the niger delta province is delineated by the geology.
The third cycle, from eocene to recent, marked the continuous growth of the main niger delta. The niger delta is framed on the northwest by a subsurface continuation of the west african shield, the benin flank. Niger delta province, nigeria, cameroon, and equatorial guinea, africa by michele l. The basin consists of progradational, paralic sequences of akata, agbada and benin formations which builds southwards into the deep waters and. The niger delta is situated in the gulf of guinea and extends throughout the niger delta province as defined by klett and others 1997. The niger delta of nigeria is a boiling cauldron and a pandora box that has exploded in the past and will likely continue to simmer for many generations until drastic steps are taken by all stakeholders to end the current political, economic and environmental impasse in the countrys economic basket. Tertiary niger delta akataagbada petroleum system no. The study area is located onshore of the niger delta nigeria, it covers an area of 40,000 km2. Structural and stratigraphic mapping of delta field. A new threefold lithostratigraphic subdivision is introduced for the niger delta subsurface, comprising an upper sandy benin formation, an intervening unit of alternating sandstone and shale named the agbada formation, and a lower shaly akata formation. Niger delta is the youngest sedimentary basin within the benue trough system. Odeyemi intermediate rocks from older granite complexes.
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