Paleoenvironment and Diagenetic Aspects of the Limestone (Gboko Formation) around Igumale, Middle Benue Trough, Nigeria: Evidence from petrography

Israel Etobro, O. I. Ejeh, Oghenerhoro Odedede

Abstract


Limestones around Igumale-1 and Igumale-2 wells, Middle Benue Trough were petrographically studied in detail with a view to determine their paleo-depositional environment and diagenetic history. Petrographic examination of the limestone shows that the limestone comprised monocrystalline quartz, ferroan calcite (3% -15%), pelloids (3% -20%),ooids (7% -10%), micrite (33% - 48%) and sparites (10% -50%). Fossil fragments consisting of foraminifera and gastropods (17% -57%), and suggest subtidal to shallow marine environment. Four sedimentary facies (oobiosparite, biosparite, biopelmicrite, and biomicrite) were recorded and characterized by moldic and vuggy porosity. This study has provided a petrographic synopsis of the limestone for further considerations, and may have an impact on both exploration and development of the limestone.
Keywords: Diagenetic; limestone; Gboko Formation; Benue; trough; marine; moldic; poor; perfomance

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