Lithostratigraphic Characterization and Petroleum System Elements of the MI Well, Niger Delta Basin
Maju-Oyovwikowhe Gladys Efetobore *
Department of Geology, University of Benin, Benin City, Nigeria.
Eguagie Michael Owenvbiugie
Department of Geology, University of Ibadan, Oyo State, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
This study presents a comprehensive lithostratigraphic characterization of the MI Well in the Niger Delta Basin through microscopic examination of ditch cutting samples. The aim was to identify the lithological units and assess the presence and distribution of petroleum system elements. A total of seventy-two samples ranging in depth from 4500ft-11460ft (1372m-3493m) were analyzed, revealing four lithological units: sandstone, shale, sandy shale, and shaly sand. Through interpretation of the lithological log, the cap/seal rock, reservoir rock, and probable source rock units were identified. The lithostratigraphic model generated from the study provides a comprehensive understanding of the depth intervals and lithological properties of the identified units. The cap/seal rock, with a thickness of approximately 460ft, was found to be the top-most shale lithology. The reservoir rock, comprising sandstone, sandy shale, and shaly sand lithologies, has a thickness of around 1920ft. The lowermost massive shale lithology, approximately 3540ft thick, is interpreted as the probable source rock for the petroleum system. These findings have significant implications for hydrocarbon exploration and production in the Niger Delta Basin. The identification of lithological units and their respective roles as cap/seal, reservoir, and source rocks allows for a better assessment of the hydrocarbon potential in the MI Well. The lithostratigraphic model, along with the established lithozones, offers valuable insights for regional correlation and comparison with other wells in the basin.
Keywords: Lithostratigraphy, petroleum system, Niger Delta Basin, microscopic examination, lithofacies units, reservoir characterization, hydrocarbon exploration