Geophysical Survey in the Northern Region of Cuyo Basin.

MAXIMILIANO GARCÍA; E. LUNA; ALVAREZ, O; SILVANA SPAGNOTTO; SILVINA NACIF; PATRICIA MARTÍNEZ; M. E. GIMENEZ

Mar del Plata

Simposio; International Symposium on the Geology - Geosur 2010; 2010

Geosur

A seismic-gravimetric survey was made in the northern area of the Cuyo basin, between the cities of San Juan and Mendoza. From the processing of gravimetric data, there was a Bouguer map of anomalies obtained, which was adequately filtered to the purpose of obtaining residual anomalies linked to the upper crust. The analysis of these Bouguer residual anomalies allowed to identify the Jocolí graven on the base of the fold and thrust belt of Precordillera. Anomaly enhancement techniques such as analytical signal, tilt and phase of tilt were done to highlight different wavelength anomalies. These gravimetric gradients match with the eastern edge of the suture area of the Pie de Palo range. Once the morphology of serious anomalies was determined, the depths and distribution of generating sources of said anomalies through the Werner and Euler deconvolutions were analyzed as well as the average of power spectrum for the structures of the survey area. From the analysis of seismic data, combined with well logs and gravimetric results, it was possible to interpret three horizons: Paleozoic, Triassic and Tertiary-Quaternary. With the obtained results, one upper crust models were done in two sections where there is more seismic coverage. The models proved the Bouguer residual anomaly and the interpretation of the seismic horizons. In the model located to the South of the survey area, a fossa sedimentary of around 7 kilometers deep infilled by Triassic and Tertiary-Quaternary sediments is interpreted. This indicates one tectonic clash area of thin skinned and thick-skinned corresponding to Cuyania and Pampia terrane. In the section located to the north of the survey area, a small inverted depocenter was interpreted through seismic and below it the Paleozoic lies uncomformably. The sedimentary layers that were confirmed by gravity and seismic, generates prospective expectation of hydrocarbon in the area.