[ Etude hydrogéologique sur le forage d’eau de Kanjiya à Mbujimayi: Une contribution à l’analyse stratigraphique du système de la Bushimay ]
Volume 67, Issue 2, July 2023, Pages 240–248
Télesphore Mayiba1, Maclin Kabemba Kabongo2, Crispin Musambayi3, Mersa KABANGU4, Albert KALAU5, Divin Tshimanga6, and Elie TSHINGULI7
1 Université officielle de Mbuji-Mayi, RD Congo
2 Assistant à l’université officielle de Mbujimayi, Faculté des sciences département de géologie, RD Congo
3 ISTA Kolwezi, RD Congo
4 Institut de Bâtiments et Travaux Publics, Mbujimayi, RD Congo
5 Licencié en Géologie, Chef des travaux à l’ISTA Kolwezi, Section Géologie et Mines, RD Congo
6 Université de Lubumbashi, RD Congo
7 Université de Kolwezi, Fac. Sciences, Dép. de Géologie, RD Congo
Original language: French
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.
The hydrogeological problems posed by the KANJIYA borehole are multiple. Kanjiya is a district located in the commune of Bipemba in the town of Mbujimayi. Although a network of 24 boreholes has been established in the town of Mbujimayi, the KANJIYA borehole has never been studied as a whole from a hydrogeological point of view. It was therefore necessary to categorise the water table, determine its hydrodynamic parameters and study its behaviour during pumping tests. The data was collected by lithological description of the cuttings taken every metre from the sediments traversed by the borehole (the rotary) with a planned depth of 117.60 meters. The data from the flow tests and the existing geological and hydrogeological knowledge allowed us to categorise the water table and its hydrodynamic parameters and to reconstruct the lithological successions of the hydrogeological units. It has been shown in this work that KANJIYA belongs to a zone of the Bushimay system and the vertical lithological section shows the succession: clayey sand, more or less soft sandstone, weathered limestone, hard limestone, hard limestone, fissured limestone, cavity and hard limestone. The water table is encountered in a fissured limestone at a depth of 84.50 meters; its behaviour during pumping tests shows that it is semi-captive. The hydrodynamic parameters are favourable for exploitation at a flow rate of over 80 m3 per hour. A low drawdown, a slow descent of the hydrostatic level and a rapid rise in the water table when pumping stops would explain the influence of a more altered and fissured aquifer.
Author Keywords: Hydrogeology, geology, drilling, sounding, water table, aquifer, hydrostatic level, drawdown.
Volume 67, Issue 2, July 2023, Pages 240–248
Télesphore Mayiba1, Maclin Kabemba Kabongo2, Crispin Musambayi3, Mersa KABANGU4, Albert KALAU5, Divin Tshimanga6, and Elie TSHINGULI7
1 Université officielle de Mbuji-Mayi, RD Congo
2 Assistant à l’université officielle de Mbujimayi, Faculté des sciences département de géologie, RD Congo
3 ISTA Kolwezi, RD Congo
4 Institut de Bâtiments et Travaux Publics, Mbujimayi, RD Congo
5 Licencié en Géologie, Chef des travaux à l’ISTA Kolwezi, Section Géologie et Mines, RD Congo
6 Université de Lubumbashi, RD Congo
7 Université de Kolwezi, Fac. Sciences, Dép. de Géologie, RD Congo
Original language: French
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
The hydrogeological problems posed by the KANJIYA borehole are multiple. Kanjiya is a district located in the commune of Bipemba in the town of Mbujimayi. Although a network of 24 boreholes has been established in the town of Mbujimayi, the KANJIYA borehole has never been studied as a whole from a hydrogeological point of view. It was therefore necessary to categorise the water table, determine its hydrodynamic parameters and study its behaviour during pumping tests. The data was collected by lithological description of the cuttings taken every metre from the sediments traversed by the borehole (the rotary) with a planned depth of 117.60 meters. The data from the flow tests and the existing geological and hydrogeological knowledge allowed us to categorise the water table and its hydrodynamic parameters and to reconstruct the lithological successions of the hydrogeological units. It has been shown in this work that KANJIYA belongs to a zone of the Bushimay system and the vertical lithological section shows the succession: clayey sand, more or less soft sandstone, weathered limestone, hard limestone, hard limestone, fissured limestone, cavity and hard limestone. The water table is encountered in a fissured limestone at a depth of 84.50 meters; its behaviour during pumping tests shows that it is semi-captive. The hydrodynamic parameters are favourable for exploitation at a flow rate of over 80 m3 per hour. A low drawdown, a slow descent of the hydrostatic level and a rapid rise in the water table when pumping stops would explain the influence of a more altered and fissured aquifer.
Author Keywords: Hydrogeology, geology, drilling, sounding, water table, aquifer, hydrostatic level, drawdown.
Abstract: (french)
Les problèmes hydrogéologiques posés par le forage de KANJIYA sont multiples. Kanjiya est un quartier situé dans la commune de Bipemba dans la ville de Mbujimayi. Si un réseau de 24 forages a été implanté dans la ville de Mbujimayi, le forage de KANJIYA n’a jamais été étudié dans son ensemble sur le plan hydrogéologique. Il était donc nécessaire de catégoriser la nappe, déterminer ses paramètres hydrodynamiques et étudier le comportement de cette dernière lors des essais de pompage. Les données ont été récoltées par description lithologiques des « cutings » prélevés tous les mètres des sédiments traversés par le forage (le rotary) ayant une profondeur prévisionnelle de 117,60 mètres. Les données des essais de débit et des connaissances géologiques et hydrogéologiques existantes nous permis de catégoriser la nappe et ses paramètres hydrodynamiques ainsi que la reconstitution des successions lithologiques des unités hydrogéologiques. Il a été démontré dans ce travail que KANJIYA appartient à une zone du système de Bushimay et la coupe lithologique verticale montre la succession: sable argileux, grès plus ou moins tendre, calcaire altéré, calcaire dur, calcaire dur, calcaire fissuré, cavité et calcaire dur. La nappe est rencontrée dans un calcaire fissuré à une profondeur de 84,50 mètres; son comportement lors des essais de pompage montre qu’il s’agit d’une semi-captive. Les paramètres hydrodynamiques sont favorables à l’exploitation de celle-ci à un débit supérieur à 80m3 par heure. Un faible rabattement, une descente lente du niveau hydrostatique et une remontée rapide de la nappe à l’arrêt du pompage expliquerait l’influence d’un aquifère plus altéré et plus fissuré.
Author Keywords: hydrogéologie, géologie, forage, sondage, nappe, aquifère, niveau hydrostatique, rabattement.
How to Cite this Article
Télesphore Mayiba, Maclin Kabemba Kabongo, Crispin Musambayi, Mersa KABANGU, Albert KALAU, Divin Tshimanga, and Elie TSHINGULI, “Hydrogeological study on water drilling from Kanjiya to Mbujimayi: A contribution to the stratigraphic analysis of the Bushimay system,” International Journal of Innovation and Scientific Research, vol. 67, no. 2, pp. 240–248, July 2023.
