Volume 40, Issue 3, September 2023, Pages 922–939
Assale Fori Yao Paul1, DANUMAH Jean Homian2, Kouao Assiè François Aristide3, Mondé Sylvain4, and KPLOHI Yaba Hervé5
1 PETROCI, Centre d’Analyses et de Recherche (CAR), Abidjan, Côte d’Ivoire
2 Centre Universitaire de Recherche et d’Application en Télédétection (CURAT), UFR des Sciences de la Terre et des Ressources Minières, Université Félix Houphouet-Boigny, Abidjan, Côte d’Ivoire
3 Université Félix Houphouët Boigny, UFR des Sciences de la Terre et des Ressources Minières, Abidjan, Côte d’Ivoire
4 Département de Géosciences Marines, UFR des Sciences de la Terre et des Ressources Minières, Université Félix Houphouët Boigny, Côte d’Ivoire
5 PETROCI, Centre d’Analyses et de Recherche (CAR), Abidjan, Côte d’Ivoire
Original language: English
Copyright © 2023 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.
In the present work, the cement and/or matrix, pores, and grains present in sandstones were quantified by tele-petrography. The selected sandstones come from the superficial formations of Ivorian onshore basin and the deep formations of offshore basin. A total of six sandstones, three from each part of Ivorian basin, were analyzed. The tele-petrographic analysis consisted of processing the images of these sandstones taken under the natural light from petrographic microscope to the R software using the «terra» package. The results show that the quantification of sandstone components depends on the magnification of the microscope image, the grain size, and the sorting. At low and medium magnifications, a small number of images per rock is sufficient to evaluate the proportions of the components. At high magnifications, however, a large number of images are required as they tend to overestimate the proportions of grains at the expense of other components (porosity, cement, matrix) if the grains have a poorly sorted. The presence of phenocrysts accentuates these variations. However, if the sandstones have a well sorting, the proportions of components hardly vary from one image to another, whatever the magnification. The density curves and histograms reveal that the number of components on these curves depends on the proportions; the higher the proportion of a component the better it is represented. Low proportions remain invisible on the density curves. Remote sensing is therefore promising for the evaluation of the petrophysical properties of reservoir rocks.
Author Keywords: Tele-petrography, R, Terra, Sandstone, Porosity, reservoir rocks.
Assale Fori Yao Paul1, DANUMAH Jean Homian2, Kouao Assiè François Aristide3, Mondé Sylvain4, and KPLOHI Yaba Hervé5
1 PETROCI, Centre d’Analyses et de Recherche (CAR), Abidjan, Côte d’Ivoire
2 Centre Universitaire de Recherche et d’Application en Télédétection (CURAT), UFR des Sciences de la Terre et des Ressources Minières, Université Félix Houphouet-Boigny, Abidjan, Côte d’Ivoire
3 Université Félix Houphouët Boigny, UFR des Sciences de la Terre et des Ressources Minières, Abidjan, Côte d’Ivoire
4 Département de Géosciences Marines, UFR des Sciences de la Terre et des Ressources Minières, Université Félix Houphouët Boigny, Côte d’Ivoire
5 PETROCI, Centre d’Analyses et de Recherche (CAR), Abidjan, Côte d’Ivoire
Original language: English
Copyright © 2023 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
In the present work, the cement and/or matrix, pores, and grains present in sandstones were quantified by tele-petrography. The selected sandstones come from the superficial formations of Ivorian onshore basin and the deep formations of offshore basin. A total of six sandstones, three from each part of Ivorian basin, were analyzed. The tele-petrographic analysis consisted of processing the images of these sandstones taken under the natural light from petrographic microscope to the R software using the «terra» package. The results show that the quantification of sandstone components depends on the magnification of the microscope image, the grain size, and the sorting. At low and medium magnifications, a small number of images per rock is sufficient to evaluate the proportions of the components. At high magnifications, however, a large number of images are required as they tend to overestimate the proportions of grains at the expense of other components (porosity, cement, matrix) if the grains have a poorly sorted. The presence of phenocrysts accentuates these variations. However, if the sandstones have a well sorting, the proportions of components hardly vary from one image to another, whatever the magnification. The density curves and histograms reveal that the number of components on these curves depends on the proportions; the higher the proportion of a component the better it is represented. Low proportions remain invisible on the density curves. Remote sensing is therefore promising for the evaluation of the petrophysical properties of reservoir rocks.
Author Keywords: Tele-petrography, R, Terra, Sandstone, Porosity, reservoir rocks.
How to Cite this Article
Assale Fori Yao Paul, DANUMAH Jean Homian, Kouao Assiè François Aristide, Mondé Sylvain, and KPLOHI Yaba Hervé, “Tele-petrography in the quantitative evaluation of petrophysical characteristics of reservoir rocks with the terra package: The case of sandstones,” International Journal of Innovation and Applied Studies, vol. 40, no. 3, pp. 922–939, September 2023.
