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Geochemical significance of tricyclic and tetracyclic terpanes in source rock extracts from the Offshore niger delta Basin,nigeria

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Acta Geochimica 2021年第2期40卷 184-198页

作者： Abiodun B.Ogbesejana Oluwasesan M.Bello Tijjani Ali Uduma A.Uduma Kamaluddeen S.Kabo Oluwadurotimi O.Akintade Department of Applied Chemistry Federal University Dutsin-MaP.M.B.5001Dutsin-MaKatsina StateNigeria Department of Chemical Sciences Koladaisi UniversityIbadanOyo StateNigeria

Tricyclic and tetracyclic terpanes are important constituents of crude oil and source rock ***,they have not been reported in the Offshore niger delta Basin,***,the present study investigated the geochemical significance of tricyclic and tetracyclic terpanes in source rock extracts from the Offshore niger delta Bain,nigeria with gas chromatography-mass spectrometry(GC-MS).The total relative abundances of tricyclic terpanes,C_(19)TT-C_(21)TT,and C_(23) TT in the rock samples ranged from 82.50 to 96.37%,50.08 to 74.17%,and 25.83 to 49.92%,*** values showed the source rocks were formed from a mixed origin(terrestrial and marine).Among the tricyclic and tetracyclic terpanes identified in the rock extracts,the conventional(C_(20)TT,C_(23)TT,C_(24)TT,C_(24)TeT)and recent(Y1,X1,Z1)were more prominent than all others,indicating mixed input of terrigenous and marine organic *** C_(24)TT/C_(23)TT,C_(24)TeT/(C_(24)TeT+C_(26)TT),C_(19)TT/C_(23)TT,C_(20)TT/C_(23)TT,C_(25)TT/C_(24)TeT,C_(25)TT/C_(26)TT,C_(19)TT/C_(20)TT,C_(24)TeT/C_(26)TT,Z1/(Z1+C_(24)TT),and Y1/(Y1+C_(24)TT)in the rock samples range from 0.33 to 1.30,0.76 to 0.90,0.18 to 0.73,0.34 to 1.05,0.33 to 1.74,0.30 to 1.39,0.31 to0.89,1.66 to 4.33,0.36 to 0.83,and 0.34 to 0.79,*** values further showed that the rock samples were formed from mixed input of terrigenous and marine organic matter and deposited under oxic to suboxic conditions in lacustrine-fluvial/deltaic ***,the C_(24)TeT/C_(20)-26TT,C_(24)TeT/C_(30)HOP,and C_(23)TT/C_(30)HOP ranged from 0.16 to 0.45,0.02 to 0.42,and 0.01 to 0.48,*** range of values suggests that source rocks were within immature to early mature ***,this study showed that tricyclic and tetracyclic terpanes were effective in determining the origin,depositional environments,and thermal maturity of source rocks in the niger delta Basin,nigeria.

关键词： Tricyclic terpanes Tetracyclic terpanes Source rocks niger delta Gas chromatography-mass spectrometry(GC-MS)

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Distribution and geochemical significance of dibenzofurans,phenyldibenzofurans and benzo[b]naphthofurans in source rock extracts from niger delta basin,nigeria

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Acta Geochimica 2020年第6期39卷 973-987页

作者： Abiodun B.Ogbesejana Oluwasesan M.Bello Department of Applied Chemistry Federal University Dutsin-MaP.M.B.5001Dutsin-MaKatsina StateNigeria

The distribution and geochemical significance of dibenzofurans,phenyldibenzofurans and benzo[b]naptho-furans in source rocks from niger delta basin,nigeria,were investigated by Rock-Eval pyrolysis and gas chro-matography--mass spectrometry(GC--MS).The data obtained from the source rocks evaluation showed that the rock samples contained type 1/III kerogen capable of generating oil and gas and were within immature to early mature *** relative abundance of the Cor,C1-and C2-dibenzofurans range from 1.75%to 29.82%,27.60%to 40.52%and 29.66%to 6889%,*** diben-zofurans were dominated by *** the C1-dibenzofurans,2-+3-methyldibenzofuran was the most abundant in the rock samples while 1-methy ldibenzofuran appeared to be the *** relative abundance of benzo[b]naphtho[1,2-d]furan(1,2]BNF),benzo[b]naph-tha[2,1-d]furan(2.1]BNF)and benzo[b]naphtha[2,3-d]fu-ran([2.3]BNF)in the rock extracts range from 12.01%to 52.58%,32.61%to 75.219%and 10.27%to 52.43%.The wide range of values recorded for the three isomers of benzo[b lnapthofurans in the samples suggest source rocks formed from mixed organic *** the pheny ldibenzofuran isomers,4-pheny ldibenzofuran was the most abundant while 1-phenyldibenzofuran was the *** ratio-1(PhFR-1)and pheny ldibenzofuran ratio-2(PhFR-2)values range from 0.13 to 1.20 and 0.11 to 2.11,*** resuls showed that the relative abundance of PhFR-1 and PhFR-2 increase gradually with increasing burial depth and maturity(VRo≤0.77%,MPI-1≤*** s 443℃),and have a good correlations with calculated vitrinite ***-I and maximum Temperature(Tmax)-This range of values suggested immature to early mature source *** source rocks were found to have shale and coul lithologics and deposited in a lacustrine/fuvial deltaic settings within immature to early mature stages based on the distribution of dibenzofurans,pheny ldiben-zofurans and benzo[b]naphthofurans in the source rock

关键词： Dibenzofurans Benzo[b]napthofurans Source rocks niger delta Gas chromatography-mass spectrometry

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Confined gravity flow sedimentary process and its impact on the lower continental slope,niger delta

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Science China Earth Sciences 2010年第8期53卷 1169-1175页

作者： LI Lei WANG YingMin ZHANG LianMei HUANG ZhiChao College of Geosciences China University of PetroleumBeijing 102249China School of Petroleum Resources Xi’an Shiyou UniversityXi’an 710065China School of Resources&Geoscience China University of Mining&TechnologyXuzhou 221008China Institute of Shanghai Offshore Oil&Gas Company China Petroleum&Chemical CorporationShanghai 200120China

There is active gravity flow sedimentation on the lower continental slope of niger delta. High-resolution 3-D seismic data enable a detailed study on the gravity flow deposition process and its impact. The lower continental slope of niger delta is characterized by a stepped complex topography, which resulted from gravity sliding and spreading during Miocene and Pliocene. Two types of accommodations are identified on the slope: ponded accommodation as isolated sub-basins and healed slope accommodation as connected tortuous corridors, where multi-scale submarine fans and submarine channels developed. Gravity flow deposition process is affected by the characteristics of gravity flows and the receiving basin. At the early stage, gravity flow deposition process was dominated by "fill and spill" pattern in the ponded accommodation, whereas it was confined to the healed slope accommodation during the late stage. On the lower continental slope of niger delta, complex slope topography controlled the distribution and evolution of the gravity flow, producing complicated gravity depositional patterns.

关键词： niger delta confined gravity flow accommodation sedimentary process

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Sequence stratigraphic analysis and hydrocarbon prospectivity of AMO Field,deep offshore niger delta,nigeria

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Energy Geoscience 2022年第1期3卷 80-93页

作者： Adeniyi Amodu Oluwaseye Peter Oyetade Suyi Lawrence Fadiya Oluwabamiwa Fowora Department of Geology Modibbo Adama UniversityYolaNigeria Department of Geology University of CalabarCalabarNigeria Department of Geology Obafemi Awolowo UniversityIle IfeNigeria Conoil Producing Limited LagosNigeria

An integrated interpretation of processed 3D seismic data,a suite of well logs,biostratigraphic data and core photographs of AMO Field,deep offshore niger delta,is carried out for the sequence stratigraphic analysis of strata penetrated by *** and key stratigraphic surfaces,that is,the maximum flooding surfaces(MFSs)and sequence boundaries(SBs),are identified based on bioevents and log *** data help the delineation of MFSs and SBs,as well as dating,determination of depositional environment and *** sequence stratigraphic study reveals seven MFSs(of 13.0 Ma,11.0 Ma,9.5 Ma,7.4 Ma,5.8 Ma,5.0 Ma and 2.7 Ma)and six SBs(of 12.1 Ma,10.3 Ma,8.5 Ma,6.3 Ma,5.5 Ma and 4.2 Ma).The key stratigraphic surfaces identified involve three depositional sequences characterized by lowstand,transgressive and highstand system tracts *** studied section is deposited in a deepwater environment ranging from Lower to Upper Bathyal and can be dated back to the Middle Miocene-Middle Pliocene in *** faults and two horizons(corresponding to reservoir units)are identified and mapped across the seismic data volume to establish a continuity of the reservoir to areas lacking well *** established sequence stratigraphic framework displays successions of sediments(system tracts)where the reservoir sand units of the lowstand and highstand system tracts are of hydrocarbon prospective units in the field.

关键词： Sequence stratigraphy Bioevents Depositional environment AMO Field niger delta

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Pore pressure prediction in offshore niger delta using data-driven approach: Implications on drilling and reservoir quality

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Energy Geoscience 2023年第3期4卷 252-265页

作者： Joshua Pwavodi Ibekwe N.Kelechi Perekebina Angalabiri Sharon Chioma Emeremgini Vivian O.Oguadinma Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSIRDUGEISTerre38000GrenobleFrance TotalEnergies SA CSTJF Avenue Larribau64000PauFrance Centre of Excellence in Petroleum Geoscience and Engineering University of BeninBenin CityEdo StateNigeria Univ.Lille CNRSUniv.Littoral Cote d’OpaleUMR 8187LOGLaboratoire d’Oceanologie et de Geosciences59000LilleFrance

Despite exploration and production success in niger delta,several failed wells have been encountered due to ***,it is very essential to understand the spatial distribution of pore pressure and the generating mechanisms in order to mitigate the pitfalls that might arise during *** research provides estimates of pore pressure along three offshore wells using the Eaton's transit time method,multi-layer perceptron artificial neural network(MLP-ANN)and random forest regression(RFR)*** results show that there are three pressure magnitude regimes:normal pressure zone(hydrostatic pressure),transition pressure zone(slightly above hydrostatic pressure),and over pressured zone(significantly above hydrostatic pressure).The top of the geopressured zone(2873 mbRT or 9425.853 ft)averagely marks the onset of overpressurization with the excess pore pressure above hydrostatic pressure(P∗)varying averagely along the three wells between 1.06−24.75 *** results from the three methods are self-consistent with strong correlation between the Eaton's method and the two machine learning *** models have high accuracy of about>97%,low mean absolute percentage error(MAPE0.98).Our results have also shown that the principal generating mechanisms responsible for high pore pressure in the offshore niger delta are disequilibrium compaction,unloading(fluid expansion)and shale diagenesis.

关键词： niger delta Pore pressure Reservoir Fracturing pressure Artifidal neural network Machine leaming algorithm Random forest regression

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Evaluation of formation susceptibility and sand production potential in an offshore field,niger delta Basin,nigeria

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Energy Geoscience 2024年第1期5卷 1-11页

作者： David O.Ubuara Yinka A.Olayinka Godwin O.Emujakporue Geoffrey C.Soronnadi-Ononiwu Department of Geology University of Port HarcourtNigeria Mease Energy nigeria Limited Port HarcourtNigeria Department of Geology University of IbadanNigeria Department of Physics University of Port HarcourtNigeria

Wellbore instability and sand production are all common challenges in the niger delta oil province,resulting in high drilling and production cost as well as damage to oil *** vulnerability of lithologic formations to wellbore instability and resultant sand production is investigated in the four delineated reservoirs of the“Areo”field,western part of niger delta *** foundation for establishing the geomechanical properties in this study was a 1-dimensional mechanical earth model,using gamma ray(GR),density(RHOB),compressional slowness(DTC),and shear slowness(DTS)*** the Areo oil field,two wells(well 001 and well 002)were *** evaluated formations are still primarily composed of compacted shale and unconsolidated sandstone,with reservoir sand units exhibiting lower elastic and rock strength properties than shale *** compressibility and porosity make sand more brittle,while low compressibility and porosity make shale stiffer due to high *** maximum force that can be applied to a shale unit without causing it to fail is 17.23 MPa,which is the maximum average rock strength of the *** means that shale requires more vertical stress or pressure than sand does in order to deform it(15.06 MPa).The three sand prediction approaches used in the analysis of sand production predictions have cut-off values that are higher than the average values of the *** Schlumberger sand production index method(S/I)indicates that the reservoir has potential for sand influx in the two wells,with the average of the four reservoirs studied in wells 001 and 002 being 1.551012 psi and 1.141012 psi ***,when a formation's sand production index is less than 1.241012 psi,as it is in this study,the formation is likely to produce *** findings support the notion that the defined sandstone units are highly unconsolidated and have a high potential for producing sands;therefore,sand control techniques must be factored in

关键词： Wireline log Stress Geo-mechanicanical characterization Sand prediction niger delta

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Source rock geochemistry of central and northwestern niger delta: Inference from aromatic hydrocarbons content

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Energy Geoscience 2023年第3期4卷 9-17页

作者： Akinsehinwa Akinlua Olugbemiga Raphael Dada Fuad Oluseyi Usman Solomon Adeniyi Adekola Fossil Fuels and Environmental Geochemistry Department of ChemistryObafemi Awolowo UniversityIle-IfeNigeria Department of Geology Obafemi Awolowo UniversityIle-IfeNigeria

The influence of origin, depositional environment and thermal maturity of organic matter on the occurrence of aromatic hydrocarbons in source rocks from the central and northwestern niger delta was investigated. Eighty two source rock samples from four oil wells in the central and northwestern niger delta were analyzed for the aromatic hydrocarbon content using gas chromatography-mass spectrometry (GC-MS). The results of analysis of aromatic hydrocarbon fractions of the source rock extracts show the presence of many classes of aromatic hydrocarbons, which include naphthalenes, phenanthrenes, biphenyls, dibenzothiophenes and fluorenes. Trimethylnaphthalene (TMN) is the most abundant among the naphthalenes while dimethylphenanthrene (DMP) is the most abundant among the phenanthrenes. Among the biphenyls, 3-methylbiphenyl (3 MB) is the most abundant while 4-methyldibenzothiophene (4MDBT) is the most abundant among the dibenzothiphenes. Only two fluorenes were detected, and fluorene is more in abundance than 1-methylfluorene (1 MF). Depositional environment indicators of aromatic hydrocarbon organic matter reveal that the organic materials in the source rocks in these wells were deposited in marine-to-swamp depositional environments under reducing to suboxic conditions. Thermal maturity indicators calculated from the abundance of the aromatic hydrocarbons indicate that the source rock samples are thermally mature. Most of the source rocks are at the peak of oil window while a few at the early oil window. Source rocks from wells GB, OP and OT in the central niger delta are thermally more mature than those from well AW in the northwestern niger delta.

关键词： Source rock Aromatic hydrocarbon Thermal maturity Depositi onal envir onment niger delta

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Environmental Impact Assessment of Selected Oil Production Facilities in Parts of niger delta, nigeria

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Journal of Water Resource and Protection 2016年第2期8卷 237-242页

作者： Samuel Bamidele Olobaniyi Omoleomeo Olutoyin Omo-Irabor Department of Geology University of Lagos Lagos Nigeria Department of Earth Sciences College of Science Federal University of Petroleum Resources Effurun Nigeria

The impact of oil production activities on the chemistry of soil and groundwater was investigated around seven production facilities, ranging from flow stations to wellhead in the western niger delta area. The method involved systematic sampling of soil and groundwater within a one kilometre radius of such facilities. The samples obtained were analysed for pH, TOC, TPH, V, Ni and Fe by standard procedures. The results indicate a general conformity of groundwater physico-chemistry to international standards for chemical potability. However, the investigated soil samples reveal in some cases elevated values of TPH (mean: 26.07 mg/kg) and Ni (mean: 8.89 mg/kg) which suggest a negative impact on the soil in the vicinity of such oil production facilities. Although ground-water may show no apparent contamination, pollutants trapped in the soil are in potential transit to groundwater, and may eventually be dissolved and transported through the soil profile to the water table by recharging rainwater. The environmental and health conditions of host communities are thereby endangered.

关键词： Impact Assessment Production Facilities Soil Groundwater Heavy Metals TPH niger delta

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Hydrogeology of Eastern niger delta: A Review

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Journal of Water Resource and Protection 2020年第9期12卷 741-777页

作者： T. K. S. Abam H. O. Nwankwoala Institute of Geosciences and Space Technology Rivers State University Port Harcourt Nigeria Department of Geology Faculty of Science University of Port Harcourt Port Harcourt Nigeria

This paper characterizes the aquifer system of the niger delta for sustainable development of the groundwater resource. The heavy-dependence on groundwater in the region and the fears of its unsustainability triggered by the weak regulations, pollution, increasing user population and industrialization coupled with the present limited knowledge of the true geological condition prevailing within the groundwater domain of the niger delta are the considerations that compelled this review study. The hydraulic properties of the region’s aquifers are discussed. The niger delta is characterized by a complex multilayered aquifer system hosted in the Benin Formation with the main body of fresh water, with increasing occurrence of intercalating clay units towards the coast. Lithological analysis indicates the prevalence of unconsolidated sand and sandy gravels in the aquiferous horizons, presenting them as pervious and prolific aquifers. Reported hydrochemical data gathered from wells drilled suggest that the quality of groundwater in the niger delta is considered generally very good and compares favorably with WHO standards for drinking water. However, relatively high iron/manganese and chloride values are localized in time and space. In the coastal areas however, seawater intrusion has been identified as one of the major influences on hydrochemistry of groundwater in the shallow unconfined aquifers. Regional groundwater flow direction is from north to south. Changes in groundwater flow directions which occur at some places generally serve localized discharge areas. The resultant flow path eventually joins and feeds the major regional north-south flow direction. The increasing pressure on groundwater, the need for urgent attention and the absence of strong institutions and regulations have made the management of groundwater resources in the region a difficult task. Therefore, future ground water resources development in the niger delta requires adequate observational data, in

关键词： Hydrogeology Groundwater Quality Saline Water Intrusion Aquifer Water Table niger delta

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Length-weight Relationship and Condition Factor of Sarotherodon Melanotheron(Perciformes:cichlidae)from Forcados River Estuary,niger delta,nigeria

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Journal of Fisheries Science 2022年第1期4卷 13-18页

作者： Efe Ogidiaka John Atadiose Betty O.Bekederemo Department of Science and Technology Fisheries and Fisheries TechnologyDelta State School of Marine TechnologyBurutuDelta StateNigeria

Length-weight relationship(LWR),condition factor(k)of the black chin tilapia,Sarotherodon melanotheron(Rüppel,1852)from Forcados River estuary nigeria was *** fish were collected monthly from fishermen for a period of 24 months(between April 2012 and March 2014).699 specimens of the fish species were *** Length-weight relationship(LWR)of the fish was evaluated using the equation:W=a L^(b) while the condition factor of the fish was determined using the equation;K=100W L^(b).The standard length of sampled *** ranged from 4.15 to 18.92 cm,total length 6.01 and 22.5 cm while the weight ranged from 7.85-286.71 *** b value 2.1299 was less than 3 indicating that the growth pattern of the fish was *** correlation co-efficient(r)value for *** was *** condition factor for the combined sexes fluctuated *** length-weight relationships and condition factor of *** in Forcados river estuary indicated that the fish were above average condition.

关键词： Sarotherodon melanotheron Length-weight relationship Condition factor Forcados River estuary niger delta

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