[ Investigation hydro géophysique dans les roches sédimentaire du socle cristallophyllien (Lubao, Lomami, RDC) ]
Volume 43, Issue 2, August 2024, Pages 396–408
Mersa KABANGU1, Fiston KALONJI2, Tresor MULUMBA3, Jerome MALEMBE4, Ben NTAMBUE BAMUAKAMA5, and Paul ONAWOTSHO OSANGOLENGA6
1 Institut de Bâtiments et Travaux Publics, Mbujimayi, RD Congo
2 Institut de Bâtiments et Travaux Publics, Mbujimayi, RD Congo
3 Institut de Bâtiments et Travaux Publics, Mbujimayi, RD Congo
4 Université de Lusambo, Lusambo, RD Congo
5 Chercheur Indépendant, RD Congo
6 Chercheur Indépendant, RD Congo
Original language: French
Copyright © 2024 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 water problem in our rural environments pushes us to evaluate how the use of geophysical methods in the crystallophyllian basement with a view to studying drilling data to investigate the subsurface in order to delimit the potential of groundwater in the crystallophyllian base, from the territory of Lubao, Province of Lomami in the DRC. The study area is surrounded by tributaries and water sources among others (the Kamina, the Tshisanpa, the Mitonga, and the Lufubu) of the Lomami basin whose water is generally of poor quality, requiring adequate treatment which is not guaranteed. The area concerned by our study is characterized in the central part, Cretaceous sedimentary lands of Mesozoic age (Loïa Formation indicated above), composed essentially of soft sandstones with intercalations of argillite, separating them into different levels aquifers. These are subhorizontal tabular terrains, laterally homogeneous, containing confined aquifers, flowing into the valleys. The water is of good quality, alkaline (pH = 6.5), weakly mineralized and with low hardness... Using geophysical methods (magnetotelluric) we carried out our study by carrying out several profiles including 7 (seven) were favorable in the area. The Lubao aquifers are essentially underlying sandstones and limestones, which means that prolific aquifers are absent. However, the main water resource lies in the limestones and sandstones, the first water sources of which are at 30m. The vertical results of the electrical surveys gave dominant 4 geoelectric layers. The underlying rocks correspond to an altered upper soil; Not all declined areas are prolific. Farm aquifers exist at different depths which vary between 150 and 180m. The data collected and processed by sites show the possibility of capturing groundwater in sufficient quantity in the fissures and Karst. Geoelectric prospecting by Magnetotelluric surveys does not give any quantitative information on the significant exploitation flow by drilling, but rather indicate the location (the favorable point) for carrying out water drilling.
Author Keywords: water, environment, mineralized, geoelectric, soil, aquifer, Karst, magnetotelluric, rock.
Volume 43, Issue 2, August 2024, Pages 396–408
Mersa KABANGU1, Fiston KALONJI2, Tresor MULUMBA3, Jerome MALEMBE4, Ben NTAMBUE BAMUAKAMA5, and Paul ONAWOTSHO OSANGOLENGA6
1 Institut de Bâtiments et Travaux Publics, Mbujimayi, RD Congo
2 Institut de Bâtiments et Travaux Publics, Mbujimayi, RD Congo
3 Institut de Bâtiments et Travaux Publics, Mbujimayi, RD Congo
4 Université de Lusambo, Lusambo, RD Congo
5 Chercheur Indépendant, RD Congo
6 Chercheur Indépendant, RD Congo
Original language: French
Copyright © 2024 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 water problem in our rural environments pushes us to evaluate how the use of geophysical methods in the crystallophyllian basement with a view to studying drilling data to investigate the subsurface in order to delimit the potential of groundwater in the crystallophyllian base, from the territory of Lubao, Province of Lomami in the DRC. The study area is surrounded by tributaries and water sources among others (the Kamina, the Tshisanpa, the Mitonga, and the Lufubu) of the Lomami basin whose water is generally of poor quality, requiring adequate treatment which is not guaranteed. The area concerned by our study is characterized in the central part, Cretaceous sedimentary lands of Mesozoic age (Loïa Formation indicated above), composed essentially of soft sandstones with intercalations of argillite, separating them into different levels aquifers. These are subhorizontal tabular terrains, laterally homogeneous, containing confined aquifers, flowing into the valleys. The water is of good quality, alkaline (pH = 6.5), weakly mineralized and with low hardness... Using geophysical methods (magnetotelluric) we carried out our study by carrying out several profiles including 7 (seven) were favorable in the area. The Lubao aquifers are essentially underlying sandstones and limestones, which means that prolific aquifers are absent. However, the main water resource lies in the limestones and sandstones, the first water sources of which are at 30m. The vertical results of the electrical surveys gave dominant 4 geoelectric layers. The underlying rocks correspond to an altered upper soil; Not all declined areas are prolific. Farm aquifers exist at different depths which vary between 150 and 180m. The data collected and processed by sites show the possibility of capturing groundwater in sufficient quantity in the fissures and Karst. Geoelectric prospecting by Magnetotelluric surveys does not give any quantitative information on the significant exploitation flow by drilling, but rather indicate the location (the favorable point) for carrying out water drilling.
Author Keywords: water, environment, mineralized, geoelectric, soil, aquifer, Karst, magnetotelluric, rock.
Abstract: (french)
La problématique de l’eau dans notre milieu rural nous incite à évaluer l’utilisation des méthodes géophysiques dans le socle cristallin en vue d’étudier les données de forage pour investiguer le sous-sol afin de délimiter le potentiel des eaux souterraines dans le socle cristallin, à partir du territoire de Lubao, province de la Lomami en RDC. La zone d’étude est entourée d’affluents et de sources d’eau, notamment les rivières Kamina, Tshisanpa, Mitonga et Lufubu du bassin de la Lomami, dont les eaux sont généralement de mauvaise qualité et nécessitent un traitement adéquat qui n’est pas garanti. La zone étudiée est caractérisée, dans sa partie centrale, par des terrains sédimentaires crétacés d’âge mésozoïque (Formation de Loïa indiquée ci-dessus), composés essentiellement de grès tendres avec des intercalations d’argilite, qui les séparent en aquifères de différents niveaux. Il s’agit de terrains tabulaires subhorizontaux, latéralement homogènes, contenant des aquifères captifs qui s’écoulent dans les vallées. L’eau est de bonne qualité, alcaline (pH = 6,5), faiblement minéralisée et de faible dureté... À l’aide de méthodes géophysiques (magnétotelluriques) nous avons réalisé notre étude en effectuant plusieurs profils dont 7 (sept) étaient favorables dans la région. Les aquifères du Lubao sont essentiellement des grès et des calcaires sous-jacents, ce qui signifie que les aquifères prolifiques sont absents. Cependant, la principale ressource en eau réside dans les calcaires et les grès dont les premières sources d’eau sont situées à 30 m. Les résultats verticaux des sondages électriques ont donné 4 couches géoélectriques dominantes. Les roches sous-jacentes correspondent à des terrains superficiels altérés ; toutes les zones en aval ne sont pas prolifiques. Les aquifères de ferme existent à différentes profondeurs variantes entre 150 et 180m. Les données collectées et traitées par les sites montrent la possibilité de capter des eaux souterraines en quantité suffisante dans les fissures et le karst. La prospection géoélectrique par sondages magnétotelluriques ne fournit pas d’informations quantitatives sur le débit significatif pour l’exploitation par forage, mais indique la localisation (le point favorable) pour la réalisation d’un forage hydraulique.
Author Keywords: eau, environnement, géoélectrique, sol, aquifer, Karst, magnetotellurique, roche.
How to Cite this Article
Mersa KABANGU, Fiston KALONJI, Tresor MULUMBA, Jerome MALEMBE, Ben NTAMBUE BAMUAKAMA, and Paul ONAWOTSHO OSANGOLENGA, “Hydrogeophysical investigation in the sedimentary rocks of the crystallophyll basement (Lubao, Lomami, DRC),” International Journal of Innovation and Applied Studies, vol. 43, no. 2, pp. 396–408, August 2024.
