Abstract
Geophysical surveys have been carried out to characterize the stratigraphical and structural setting and to better understand the deep water circulation system in the Venosa area (Southern Italy) located in the frontal portion of the southern Appenninic Subduction. In this area there are some deep water wells from which a water con- ductivity of about 3 mS/cm and a temperature of about 35°C was measured. A deep geoelectrical tomography with dipole-dipole array has been carried out along a profile of 10000 m and an investigation depth of about 900 m. Furthermore a broad band magnetotelluric profile consisting of six stations was performed to infer the resis- tivity distribution up to some kilometres of depth. The MT profile was almost coincident with the geoelectrical outline. The applied methods allow us to obtain a mutual control and integrated interpretation of the data. The high resolution of the data was the key to reconstruct the structural asset of buried carbonatic horst whose top is located at about 600 m depth. The final results coming from data wells, geothermal analysis and geophysical da- ta, highlighted a horst saturated with salted water and an anomalous local gradient of 60°C/km. The proposed mechanism is that of a mixing of fossil and fresh water circulation system.
Highlights
The Southern Apennine crustal structure is well known, but there are many unknown aspects, among which the position of buried
This paper focuses on the analysis of geological and geophysical data compared with borehole stratigraphies to have an image of Apulian buried structures and to understand the deep water circulation system
Electrical resistivity tomography is widely applied in small-scale investigations to solve environmental and engineering problems
Summary
The Southern Apennine crustal structure is well known, but there are many unknown aspects, among which the position of buried. Geophysical methods have been effective tools for studying tectonically active areas and reflection seismic and magnetotelluric surveys provide high-resolution images of deep struc-. This paper focuses on the analysis of geological and geophysical data compared with borehole stratigraphies to have an image of Apulian buried structures and to understand the deep water circulation system. The geophysical results, the seismic Bradanic Deep Structural Map (Sella et al, 1988), 3 stratigraphies of AGIP Petroleum drilling wells in the 50’ 60’ years in the towns of Venosa, Lavello and Montemilone, 2 stratigraphies of fluvial-lacustrine Venosa basin, 2 stratigraphies deep wells of Vulture-AltoBradano Consortium help to reconstruct the succession and the lithostratigraphy of the observed area
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