The hydroelectric problem of porous rocks: inversion of the position of the water table from self-potential data

摘要: SUMMARY The self-potential (SP) method is a fast and cheap reconnaissance tool sensitive to ground water flow in unconfined aquifers. A model based on the use of Green's functions for coupled hydroelectric problem yields an integral equation relating SP field distribution piezometric head describing phreatic surface electrical resistivity contrast through this surface. We apply data measured south flank Piton de la Fournaise volcano, large shield volcano located Reunion island, Indian ocean. The surface, inverted with help Simplex algorithm from data, agrees well available information area [one borehole electromagnetic (EM) data]. This interpretation scheme, which we call electrography, has many applications crucial supply volcanic areas where drilling expensive.