Volume 30, Issue 1, July 2020, Pages 162–173
Neino Abdoulaye Garba1, Kouakou Alphonse Yao2, Moussa Harouna3, and Isaac FEA4
1 Laboratoire de Génie Civil, des Géosciences et Sciences Géographiques, Institut National Polytechnique Félix Houphouët-Boigny, Yamoussoukro BP 1093, Côte d’Ivoire
2 Laboratoire de Génie Civil, des Géosciences et Sciences Géographiques, Institut National Polytechnique Félix Houphouët-Boigny, Yamoussoukro BP 1093, Côte d’Ivoire
3 Laboratory of geology, sedimentary team basins and georessources, Faculty of science and technology, Abdou Moumouni University, Niger
4 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
Original language: English
Copyright © 2020 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This study is a contribution to the petrographic and petrophysical characterization of the reservoir sandstones of Yogou Formation in the Termit Sedimentary Basin (Niger). It focuses on the impact of diagenetic processes on the petrophysical properties of Campanian sandstones. The pore types are generally intergranular, intragranular, and rare microcracks. The porosity varies from 0.3% to 25.3% and the permeability ranges from 0.1 mD to 470.3 mD. Diagenetic features that influenced the reservoir quality evolution include mechanical and chemical compaction, precipitation of carbonate cement, clay mineral cement, the formation of quartz overgrowths, and dissolution of feldspar grains. Compaction and cementation reduced significant volumes of primary porosity and permeability. On the other hand, feldspar dissolution and quartz corrosion contributed to an increase in the volume of primary porosity of the sandstones. The Yogou Formation reservoir was subjected to a high diagenetic overprint resulting in marked reservoir heterogeneity. This study also demonstrated the effect of diagenetic processes on the quality of hydrocarbon reservoirs and showed that good quality reservoirs are mainly concentrated in the 2545 m to 2565 m depth range of the study area.
Author Keywords: Diagenesis, reservoir quality, porosity, permeability, Yogou Formation, Campanian sandstones.
Neino Abdoulaye Garba1, Kouakou Alphonse Yao2, Moussa Harouna3, and Isaac FEA4
1 Laboratoire de Génie Civil, des Géosciences et Sciences Géographiques, Institut National Polytechnique Félix Houphouët-Boigny, Yamoussoukro BP 1093, Côte d’Ivoire
2 Laboratoire de Génie Civil, des Géosciences et Sciences Géographiques, Institut National Polytechnique Félix Houphouët-Boigny, Yamoussoukro BP 1093, Côte d’Ivoire
3 Laboratory of geology, sedimentary team basins and georessources, Faculty of science and technology, Abdou Moumouni University, Niger
4 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
Original language: English
Copyright © 2020 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
This study is a contribution to the petrographic and petrophysical characterization of the reservoir sandstones of Yogou Formation in the Termit Sedimentary Basin (Niger). It focuses on the impact of diagenetic processes on the petrophysical properties of Campanian sandstones. The pore types are generally intergranular, intragranular, and rare microcracks. The porosity varies from 0.3% to 25.3% and the permeability ranges from 0.1 mD to 470.3 mD. Diagenetic features that influenced the reservoir quality evolution include mechanical and chemical compaction, precipitation of carbonate cement, clay mineral cement, the formation of quartz overgrowths, and dissolution of feldspar grains. Compaction and cementation reduced significant volumes of primary porosity and permeability. On the other hand, feldspar dissolution and quartz corrosion contributed to an increase in the volume of primary porosity of the sandstones. The Yogou Formation reservoir was subjected to a high diagenetic overprint resulting in marked reservoir heterogeneity. This study also demonstrated the effect of diagenetic processes on the quality of hydrocarbon reservoirs and showed that good quality reservoirs are mainly concentrated in the 2545 m to 2565 m depth range of the study area.
Author Keywords: Diagenesis, reservoir quality, porosity, permeability, Yogou Formation, Campanian sandstones.
How to Cite this Article
Neino Abdoulaye Garba, Kouakou Alphonse Yao, Moussa Harouna, and Isaac FEA, “Petrographic characterization of Campanian sandstones in the Termit basin (Niger): Diagenetic implication on the reservoir quality,” International Journal of Innovation and Applied Studies, vol. 30, no. 1, pp. 162–173, July 2020.
