Deep-seismic imaging across los Chihuidos arch, Neuquén basin, argentina (38° SL)

ALBERTO COMÍNGUEZ; JUAN FRANZESE

Buenos Aires

Simposio; GEOSUR; 2004

Deep reprocessing of historical industrial seismic-lines supplied interpretive information down to 30 km . Once again, seismic data reprocessed with "selftruncating extended correlation", confirmed an economic way of getting acoustic information where Vibroseis uncorrelated records are available. A conspicuous acoustic contrast at about 24 km depth, is interpreted as the top of the Lower Crust.conspicuous acoustic contrast at about 24 km depth, is interpreted as the top of the Lower Crust. An oblique reflector horizon between 16 and 18 km depth, is considered as a master shear that surely controlled the extension of the whole rift system during theLate Triassic-Early Jurassic period.n oblique reflector horizon between 16 and 18 km depth, is considered as a master shear that surely controlled the extension of the whole rift system during theLate Triassic-Early Jurassic period. A sub-master fault dipping about 8°W, has been related with the evolution of the Studied Area.sub-master fault dipping about 8°W, has been related with the evolution of the Studied Area. An important inversion event occurred during the Bathonian-Callovian, sensiblyaffected the western sector of the ‘Dorso de los Chihuidos’n important inversion event occurred during the Bathonian-Callovian, sensiblyaffected the western sector of the ‘Dorso de los Chihuidos’ Bipolar inversion features developed during the transition to the CuyoGroup in a marine environment, are responsible of small-traps (attractive under the point ofview of the oilindustry). This inversion episode dated Pliensbachian-Toarcian, is previous to the Bathonian-Callovian inversion, and is not reported in previous papers.ipolar inversion features developed during the transition to the CuyoGroup in a marine environment, are responsible of small-traps (attractive under the point ofview of the oilindustry). This inversion episode dated Pliensbachian-Toarcian, is previous to the Bathonian-Callovian inversion, and is not reported in previous papers. A middle Jurassic postrif episode was characterized by a deltaic depositional system prograding to the west with accentuate high energy.middle Jurassic postrif episode was characterized by a deltaic depositional system prograding to the west with accentuate high energy.