**3. Methodology**

#### **3.1 Geological survey**

First, a compilation of the existing geological information that already exists of the State of San Luis Potosí that was published by the Institute of Geology, Autonomous University of San Luis Potosi and the Mexican Geological Service is performed. Once the existing information has been compiled, a geological survey

**29**

**Figure 3.**

*Potosí, Mexico.*

**Figure 2.**

**3.2 Geophysical study**

*The Magnetometry—A Primary Tool in the Prospection of Underground Water*

*Geological map of the Villa de Ramos area modified after Labarthe and Aguillón [7].*

of the study area is carried out to locate the geological units that can exist in the area under the study and a digital elevation model formed (**Figure 3**). In addition, **Figure 4** indicates a geological map of the study area and an idealized diagrammatic

*Elevation digital model where La Dulcita (1) Villa de Ramos (2) and the H2O well (3) are located, San Luis* 

The geophysical study is comprised of several stages; first, the aeromagnetic information of study area is analyzed. This is done by applying a series of mathematical algorithms (filters) to the aeromagnetic data, which allow highlighting certain

model where the main structures and existing geological units are indicated.

*DOI: http://dx.doi.org/10.5772/intechopen.84322*

*The Magnetometry—A Primary Tool in the Prospection of Underground Water DOI: http://dx.doi.org/10.5772/intechopen.84322*

**Figure 2.** *Geological map of the Villa de Ramos area modified after Labarthe and Aguillón [7].*

#### **Figure 3.**

*Magnetometers - Fundamentals and Applications of Magnetism*

its capacity measured less than 1 L/s, which was not sufficient for the entire population. In addition, the State Water Commission (CEA, for its acronym in Spanish),

The rocks that form the aquifers are characterized by their physical properties such as porosity, permeability and water content [5, 6]. The present methodology allows locating the zones and the degree of fracture and measure if these can be

The Geology of the study area is represented mainly by the alluvial deposits approximately to the south of the La Dulcita, an outcrop of basaltic rocks exist in this area, whose height is approximately 15 m from the ground level (**Figure 2**). In the East, there are outcrops of the Caracol Formation, of the Upper Cretaceous [7] forming hills that protrude from the plains (**Figure 3**). It consists of shales of a greenish color, sometimes very dark gray. In the area of the Villa de Ramos, there is a large granite extension, which has almost a North-South course and constitutes a tectonic pillar that presents mineralization in some areas. In addition, also towards the North of Villa de Ramos, there are outcrops of marine sedimentary rocks [7]. La Dulcita area is located in a tectonic pit where the base must be represented by

First, a compilation of the existing geological information that already exists of the State of San Luis Potosí that was published by the Institute of Geology, Autonomous University of San Luis Potosi and the Mexican Geological Service is performed. Once the existing information has been compiled, a geological survey

State of San Luis Potosí, had drilled three wells and all of them were dry.

*Satellite image of study area, that is, La Dulcita, villa de Ramos, state of San Luis Potosí, Mexico.*

marine sedimentary rocks and probably basaltic lava flows.

associated to moisture from the surface.

**2. Study area**

**Figure 1.**

**3. Methodology**

**3.1 Geological survey**

**28**

*Elevation digital model where La Dulcita (1) Villa de Ramos (2) and the H2O well (3) are located, San Luis Potosí, Mexico.*

of the study area is carried out to locate the geological units that can exist in the area under the study and a digital elevation model formed (**Figure 3**). In addition, **Figure 4** indicates a geological map of the study area and an idealized diagrammatic model where the main structures and existing geological units are indicated.
