Analysis of the geometry in depth of conductive fractures in zones of low permeability using electrical tomography(El Berrocal, Spanish Central System)

摘要

The groundwater flow in zones of low permeability, as granites, is mainly associated with zones of fracture.For this reason the characterization of the fractures is fundamental, both in surface as in depth, and mustintegrate geological information (geological mapping, structural analysis), geophysics (mainly electricaland electromagnetic methods) and geochemistry (radon and others gases) with hydrogeology. In this workwe analyze the geophysical response of a strike-slip fault zone by means of three 2D resistivity models. Theobjective is to investigate the presence of several conductive zones and their geometry in depth. Theobtained results allow to control the geometry in depth of the fractures, the gaps between the differentmapped traces along the fault zone as well as the thickness of landfill. All this information will be useful forthe hidromechanical simulation of the massif, and to check the geometry and gas permeability calculatedfrom emanometry