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Hydrocarbon generation potential of Campano-Maastrichtian to Paleogene shales in the Benin Flank of the Anambra Basin,SW Nigeria

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Energy Geoscience 2024年第3期5卷 103-116页

作者： Omabehere Innocent Ejeh Israel Aruoriwo Abiodun Etobro Konstantinos Perleros jude etunimonuwa ogala Ajayi Olugbenga Ehinola Kimon Christanis Stavros Kalaitzidis Department of Geology Delta State UniversityAbrakaNigeria Geo-Energy Resources Team Laboratory of Economic GeologyDepartment of GeologyUniversity of PatrasRio-PatrasGreece Department of Geology University of IbadanIbadanNigeria

The hydrocarbon generation potential of the Campano-Maastrichtian to Paleogene shales from the Benin Flank(located in SW Nigeria)of the Anambra Basin,has been previously investigated mostly by studying outcrops and by relatively few subsurface data-based ***,it is expedient undertaking an assessment of the hydrocarbon generation potential of this frontier area from subsurface ***-Maastrichtian to Paleogene shale samples obtained from Egoli-1 borehole in the Benin Flank of the Anambra Basin are studied by means of HAWK programmed pyrolysis,organic petrography,and mineralogy(XRD),with the aim to explore the petroleum-generating potential and the thermal *** obtained results display a significant variation of the TOC content ranging from very low(5%),indicating poor to excellent oil potential based on S_(2)values under the condition,of course,the studied formations reached the oil *** shales of the Nsukka and Imo Formations display lower petroleum-generating potential than these of the Mamu *** the studied samples are dominated by gas-prone(type III)and inert(type IV)kerogens,with few displaying mixed II/III(oil-and gas-prone).The organic-petrography observations support partly the results of the HAWK programmed pyrolysis,as they reveal an organic-richer Mamu Formation in comparison to the Nsukka and Imo Formations;huminite/vitrinite particles(both indigenous and recycled)along with variable contents of liptinite(mostly alginite and bituminite)and inertinite macerals(mostly inertodetrinite)are hosted in the *** latter display a typical composition for fine-grained clastic sediments;mostly kaolinite,illite/montmorillonite,quartz,and subordinately,*** terms of thermal maturity,huminite/vitrinite reflectance data points to immature stage;however,the occurrence of solid bitumens,displaying equivalent vitrinite reflectance values within the oil window,points to an active petroleum system in s

关键词： Maceral Mamu Formation Thermal maturity Solid bitumen Source rock Vitrinite reflectance

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