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Outcrops as windows to petroleum systems:Insights from the southern Bida Basin,Nigeria

Energy Geoscience 2024年第3期5卷 284-304页

作者： Godwin Okumagbe Aigbadon Felix Iwebunor Chinyem Tope Shade Alege Brume Overare Obinna Chigoziem Akakuru Ikenna Arisi Obasi Ernest Orji Akudo Azuka Ocheli Jeremiah Ayok Onimisi Abdullateef Jimoh Elesius Okey Akpunonu Mu'awiya Baba aminu bashir ozovehe aminu Department of Geology Faculty of SciencesFederal University LokojaKogi StateNigeria Department of Geology Faculty of ScienceDelta State UniversityAbrakaDelta StateNigeria Department of Earth Sciences Memorial University of NewfoundlandCanada Department of Earth Sciences Federal University of Petroleum ResourcesEffurunDelta StateNigeria Department of Geology School of Physical SciencesFederal University of TechnologyOwerriImo StateNigeria Department of Geology Nnamdi Azikiwe UniversityAwkaAnambra StateNigeria Department of Geology University of IlorinKwara StateNigeria

The study assessed petroleum systems in the southern Bida Basin,Nigeria,focusing on the Cretaceous *** comprise Lokoja and Patti Formation sandstones,while shales,claystone,and siltstone serve as source rocks and stratigraphic traps/*** studies delineating the key elements of the petroleum systems in the basin have not been conducted due to a lack of subsurface *** goal of the current study was to use field observations,Scanning Electron Microscopy(SEM),X-ray diffraction(XRD),and geochemical and geomechanical data to evaluate key components of petroleum systems in the southern Bida *** results presented in this investigation are intended to attain specific objectives,especially those lacking in the basin's study *** analysis revealed that the Lokoja Sandstone has porosity of 37%-39.5%and moderate permeability of 23.22-42.29 *** Patti Formation sandstone reservoirs exhibited high porosity(38%-42%)and moderate to good permeability(31.54-66.48 mD),suggesting good potential *** results revealed intragranular pores and micro-fractures in the Patti Shale,whereas the sandstone reservoirs in the Lokoja and Patti formations displayed fractures,facilitating hydrocarbon *** was the dominant mineral in the sandstone units of both *** analysis revealed that brittle and clay minerals influenced the microstructure of Patti *** analysis indicated promising petroleum potential in the Patti Shale,with a total organic carbon(TOC)content of 1.87 wt%,free hydrocarbon from kerogen(S1)of 0.41 mg/g,hydrogen index(HI)of 0.75 mg HC/g TOC,and production index(PI)of *** Patti and Lokoja formations'shale,claystone,and siltstone exhibited sealing potential,with a plasticity index of 24-35 and coefficient permeability of 2.8×10^(-4)-3.6×10^(-4)cm/*** studies,XRD,geochemical data,and geomechanical index values have confirmed the key components of the petroleum system,which in turn

关键词： Geochemical analysis Plasticity index Source rock Reservoir rock Stratigraphic trap Bida Basin

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