CONTRIBUTION DES OUTILS DE SIG ET GEOPHYSIQUE DANS L’IDENTIFICATION DE L’AQUIFERE LIASIQUE. CAS DE LA REGION DE MRIRT, CAUSSE DU MOYEN ATLAS (MAROC)

Une prospection géophysique par méthode électrique a été réalisée dans la région de Mrirt située au cœur du Causse du Moyen Atlas. Le but de cette étude géophysique est d’identifier la géométrie et la structure profonde de l’aquifère du Lias et tracer le schéma de son fonctionnement hydrogéologique afin de déterminer les zones les plus potentielles pour l’implantation des ouvrages de captage d’eau souterraine.   Pour atteindre cet objectif, 39 sondages électriques de type Schlumberger ont été réalisés dans la zone d’étude. Le traitement de ces sondages électriques a été réalisé l’aide du logiciel WinSEV 6 de GEOSOFT. L’interprétation des résultats obtenus a permis de révéler deux formations aquifères attribuées à des terrains calcaires et dolomitiques du Lias inférieur et moyen, séparées par une couche marno-argileuse dont l’épaisseur oscille entre 5 et 10m. Le toit de ces deux aquifères montre une structure ondulatoire qui remonte et s’épaissit vers le Sud-Est de la zone d’étude en direction des affleurements de calcaires et de dolomies du Lias inférieur-moyen généralement fracturés, où leur puissance atteint une valeur maximale d’épaisseur de l’ordre de 52 m . La compilation des résultats de la prospection géophysique avec les données géologiques et hydrogéologiques et leur intégration dans une base de données SIG a permis d’élaborer la carte des zones de forte productivité des deux aquifères décelés dans la zone d’étude. Cette carte constitue un document de base pour déterminer les sites les plus potentiels pour l’implantation des forages à forte probabilité de réussite

CONTRIBUTION DES OUTILS DE SIG ET GEOPHYSIQUE DANS L’IDENTIFICATION DE L’AQUIFERE LIASIQUE. CAS DE LA REGION DE MRIRT, CAUSSE DU MOYEN ATLAS (MAROC)

A geophysical prospecting by electrical method has been carried out in the region of Mrirt located in the heart of the causse of the Middle Atlas. The purpose of this geophysical study is to identify the geometry and the deep structure of the aquifer of the Lias and draw the schema of its hydrogeological function to determine the potential areas for the implantation of the Surveys of recognition. To achieve this objective, 39 Schlumberger Electrical Soundings have been carried out in the study area. The treatment of the geophysical measures has been achieved by using the software WinSEV 6 of GEOSOFT. The interpretation of the results has allowed revealing two aquifers assigned to the limestones and dolomitic lands of the middle and lower Lias, separated by a clay layer whose thickness varies between 5 and 10m. The roof of these two aquifers presents a wave structure, which goes back and thickens toward the south east of the study area in the direction of the outcrops of limestone and dolomitic lands of the Lias generally fractured where their thickness reaches a maximum value of 52 m. The compilation of the geophysical prospecting results with the geological and hydrogeological data and their integration into a GIS database has allowed creating a map of high productivity areas of the aquifers found in the study area. This card is a basic document to determine the sites with the greatest potential for the implantation of the drilling with high probability of success

Diagnosis of the Ghiss Nekor aquifer in order to elaborate the aquifer contract

The Ghiss-Nekor aquifer, located in the north-east of the action area of the ABHL, plays a strategic role in the drinkable water supply of the city of Al Hoceima and of the neighboring urban areas. It also participates in the irrigation of PMH. However, this aquifer has problems such as over-exploitation and pollution. In the face of these problems, the only Solution is the establishment of a new mode of governance, which privileges the participation, the involvement and the responsibility of the actors concerned in a negotiated contractual framework, namely the aquifer contract. The purpose of this study is to diagnose the current state of the Ghiss Nekor aquifer, the hydrogeological characterization of the aquifer, the use of the waters of the aquifer, the Problem identification and the introduction of the aquifer contract, which aims at the participatory and sustainable management of underground water resources in the Ghiss- Nekor plain, to ensure sustainable development

Diagnosis of the Ghiss Nekor aquifer in order to elaborate the aquifer contract

The Ghiss-Nekor aquifer, located in the north-east of the action area of the ABHL, plays a strategic role in the drinkable water supply of the city of Al Hoceima and of the neighboring urban areas. It also participates in the irrigation of PMH. However, this aquifer has problems such as over-exploitation and pollution. In the face of these problems, the only Solution is the establishment of a new mode of governance, which privileges the participation, the involvement and the responsibility of the actors concerned in a negotiated contractual framework, namely the aquifer contract. The purpose of this study is to diagnose the current state of the Ghiss Nekor aquifer, the hydrogeological characterization of the aquifer, the use of the waters of the aquifer, the Problem identification and the introduction of the aquifer contract, which aims at the participatory and sustainable management of underground water resources in the Ghiss- Nekor plain, to ensure sustainable development

Application of electrical geophysics to the release of water resources, case of Ain Leuh (Morocco)

Being seen needs in increasing waters in our contry for fine domestics, manufactures and agricultural, the prospecting of subterranean waters by geologic and hydrogeologic classic method remains inaplicable in the cases of the regions where one does not arrange drillings or polls (soundings) of gratitude (recongnition) in very sufficient (self-important) number. In that case of figure, the method of prospecting geophysics such as the method of nuclear magnetic resonance (NMR) and the method of the geophysics radar are usually used most usually because they showed, worldwide, results very desive in the projects of prospecting and evaluation of the resources in subterranean waters. In the present work, which concerns only the methodology of the electric resistivity, we treat the adopted methodological approach and the study of the case of application in the tray of Ajdir Ain Leuh

Application of electrical geophysics to the release of water resources, case of Ain Leuh (Morocco)

Being seen needs in increasing waters in our contry for fine domestics, manufactures and agricultural, the prospecting of subterranean waters by geologic and hydrogeologic classic method remains inaplicable in the cases of the regions where one does not arrange drillings or polls (soundings) of gratitude (recongnition) in very sufficient (self-important) number. In that case of figure, the method of prospecting geophysics such as the method of nuclear magnetic resonance (NMR) and the method of the geophysics radar are usually used most usually because they showed, worldwide, results very desive in the projects of prospecting and evaluation of the resources in subterranean waters. In the present work, which concerns only the methodology of the electric resistivity, we treat the adopted methodological approach and the study of the case of application in the tray of Ajdir Ain Leuh