HYDROGEOLOGICAL MAPPING OF A MIOCENE AQUIFER BY TWO-DIMENSIONAL ELECTRICAL IMAGING
Journal Title: UNKNOWN - Year 2003, Vol 15, Issue 1
Abstract
Geoelectrical resistivity methods have been playing very important role in hydrogeological explorations for years, since they can provide information lithology porosity, permeability and water quality. But conventional resistivity methods, electrical sounding and electrical profiling, cannot satisfy demand for continuos coverage over an exploration area and for building of a detailed hydrogeological model, especially with complex geological models and 3-D structure shapes. Electrical sounding is based on a theoretical assumption of a horizontally stratified earth model, and electrical profiling maps only lateral resistivity changes at the same depth. Two-dimensional (2-D) electrical imaging (or 2-D electrical tomography), that has been introduced recently, can map the both vertical and lateral resistivity changes and provides for building three-dimensional (3-D) resistivity model of the underground. Exploration has been carried out in the area of the Seona spring to investigate the possibility for pumping more water during dry season, from the well located near the spring. The water of the Seona spring emerges from Badenian carbonate aquifer, which shows irregular 3-D shape and heterogeneous lithologic composition. A network consisting of four electrical profiles has been established to acquire a 3-D resistivity model, which can be transformed in a 3-D hydrogeological model. Inverse resistivity model sections revealed high resistivity zone which has been correlated with Badenian limestone by means of existing outcrops. Low resistivity zones point to the marly layers. Exploratory borehole located on the basis of electrical data has confirmed derived hydrogeological model from the electrical imaging data. Heterogeneous limestone aquifer has been uncovered at depth 8.2 – 55 m. The aquifer is weathered and karstificated with two main cavern intervals. Hydraulic connections between the caverns and the spring have been established during drilling, but also in a pump test by means of the airlift method. The presented case demonstrates great possibilities of the electrical imaging method in mapping of irregularly shaped aquifers and building of a precise 3-D hydrogeological model.
Authors and Affiliations
Franjo Šumanovac Kosta Urumović Ivan Dragičević
Keywords
Related Articles
- EP ID EP29934
- DOI -
- Views 186
- Downloads 2
BARITE, HEMATITE AND CINNABAR ORE DEPOSITS IN THE DUSINA AREA, MID-BOSNIAN SCHIST MOUNTAINS
In the Dusina area, which is built up of Lower Palaeozoic metasediments, Devonian carbonate complex and Upper Palaeozoic metarhyolites unconformab1y overlain by Upper Permian sediments, numerous ore occurrences have been...
PALINOLOŠKI MODEL MLAĐIH NEOGENSKIH NASLAGA ISTOČNE SLAVONIJE (HRVATSKA)
Palinološkim analizama naslaga mlađeg neogena iz eksploatacijske bušotine u prostoru Istočne Slavonije postavljene su 3 vegetacijske zone (Z1, Z2, Z3) koje su uvjetovane klimatskim odrednicama. Na osnovi međusobnih posto...
HRVATSKI STUDENTSKI OGRANAK SPE-a
U proljeće ove godine, od 13. do 15. svibnja 2015. godine, hrvatski studentski ogranak SPE-a bio je domaćin druge po redu međunarodne studentske energetske konferencije (ASEC 2015). Primarni je cilj ove konferencije oku...
NEMETALNE MINERALNE SIROVINE HRVATSKE
Nemetalne mineralne sirovine su znatno prirodno bogatstvo Hrvatske koje, u suporedbi s razvijenim svijetom, nije dovoljno iskorišteno. Gospodarski potencijal Hrvatske za 12 nemetalnih mineralnih sirovina neograničenih re...
OD ZNAČAJNOG RUDNIKA SREBRA I URANA ST. JOACHIMSTHAL, ODNOSNO JÁCHYMOV, DO RADONSKIH TOPLICA U SASKO-ČEŠKOJ «RUDNOJ GORI»
U malom naselju Konnradsgrünnu na jugozapadnim padinama Erzgebirgea otkrili su saski rudari početkom XVI. st. srebrenu rudu u dolini, koju su po zaštitniku naselja Sv. Joachymu nazvali Jochymsthal, a srebreni novac Jochy...