Volume 39, Issue 2, November 2018, Pages 120–138
Isaac FEA1, Bakary FOFANA2, N'Goran Jean-Paul Yao3, Hervé Yaba KPLOHI4, Emmanuel Tokpa GOUA5, Zéli Bruno Digbehi6, and Kader Moritier BAMBA7
1 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
2 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
3 Département des Géosciences Marines, Université Félix Houphouët Boigny de Cocody, Abidjan, Côte d'Ivoire
4 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
5 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
6 Laboratoire de Géologie, Ressources Minérales et Energétiques, UFR des Sciences de la Terre et des Ressources Minières (STRM), Université Félix Houphouët Boigny Cocody, 22 BP 801, Abidjan 22, Côte d'Ivoire
7 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
Original language: English
Copyright © 2018 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 paper presents the results of the detailed petrographical analysis of sandstone samples from three wells from the offshore Ivorian Basin. The study reveals the presence of three types of sandstones in the Albian – Cenomanian succession, namely subarkoses, arkoses and lithic arenites, with dominant detrital minerals comprising quartz, feldspar and lithic fragments. The main authigenic minerals comprise calcite, siderite, silica, kaolinite and pyrite, while the key diagenetic events include compaction, dissolution and recrystallization of feldspar, neoformation and replacement of feldspar, and finally cementation. Primary pore spaces are reduced or occluded by calcite, silica, siderite and pyrite. Secondary porosity was created locally from the dissolution of feldspars but has been partly reduced by authigenic kaolinite. The presence of illitized kaolinite overgrowths and dissolved feldspars, together with significant quartz and the mainly concavo-convex and stylolithic contacts between quartz grains, suggest that the Albian-Cenomanian sandstones of the Ivorian Basin have reached an advanced stage of diagenesis. These diagenetic processes affect petrophysical values which varied as a function of depth.
Author Keywords: Sandstone, diagenetic, porosity, permeability, Cenomanian, Albian.
Isaac FEA1, Bakary FOFANA2, N'Goran Jean-Paul Yao3, Hervé Yaba KPLOHI4, Emmanuel Tokpa GOUA5, Zéli Bruno Digbehi6, and Kader Moritier BAMBA7
1 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
2 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
3 Département des Géosciences Marines, Université Félix Houphouët Boigny de Cocody, Abidjan, Côte d'Ivoire
4 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
5 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
6 Laboratoire de Géologie, Ressources Minérales et Energétiques, UFR des Sciences de la Terre et des Ressources Minières (STRM), Université Félix Houphouët Boigny Cocody, 22 BP 801, Abidjan 22, Côte d'Ivoire
7 Petroci, Analysis and Research Center (CAR), BP V 194 Abidjan, Côte d'Ivoire
Original language: English
Copyright © 2018 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 paper presents the results of the detailed petrographical analysis of sandstone samples from three wells from the offshore Ivorian Basin. The study reveals the presence of three types of sandstones in the Albian – Cenomanian succession, namely subarkoses, arkoses and lithic arenites, with dominant detrital minerals comprising quartz, feldspar and lithic fragments. The main authigenic minerals comprise calcite, siderite, silica, kaolinite and pyrite, while the key diagenetic events include compaction, dissolution and recrystallization of feldspar, neoformation and replacement of feldspar, and finally cementation. Primary pore spaces are reduced or occluded by calcite, silica, siderite and pyrite. Secondary porosity was created locally from the dissolution of feldspars but has been partly reduced by authigenic kaolinite. The presence of illitized kaolinite overgrowths and dissolved feldspars, together with significant quartz and the mainly concavo-convex and stylolithic contacts between quartz grains, suggest that the Albian-Cenomanian sandstones of the Ivorian Basin have reached an advanced stage of diagenesis. These diagenetic processes affect petrophysical values which varied as a function of depth.
Author Keywords: Sandstone, diagenetic, porosity, permeability, Cenomanian, Albian.
How to Cite this Article
Isaac FEA, Bakary FOFANA, N'Goran Jean-Paul Yao, Hervé Yaba KPLOHI, Emmanuel Tokpa GOUA, Zéli Bruno Digbehi, and Kader Moritier BAMBA, “DIAGENETIC CONTROL ON THE PETROPHYSICAL PROPERTIES OF ALBIAN-CENOMANIAN SANDSTONES IN THE IVORIAN BASIN, WEST AFRICA,” International Journal of Innovation and Scientific Research, vol. 39, no. 2, pp. 120–138, November 2018.
