Resumo

ROSSELLO, Eduardo Antonio. La fracturación del borde oriental de las Sierras Australes de Buenos Aires y su potencial como reservorio de fluidos en la adyacente Cuenca Claromencó. Rev. Asoc. Geol. Argent. [online]. 2016, vol.73, n.4, pp.493-512. ISSN 0004-4822.

The structural study of the petrophysical characteristics and the spatial arrangement of the fracturing in the exposed sedimentary rocks along the eastern edge of the Sierras Australes de Buenos Aires is the main objective of this work. These outcrops correspond to the Tunas Formation of the Pillahuincó Group (upper Paleozoic), being the closest and correlated with the sedimentary sequences located in the adjacent foreland Claromecó basin. According to available subsurface information the paleozoic sequences have potential hydrocarbon generation from the pelitic levels and coals swarms that could be source rocks placed on reservoirs levels with adequate porosity to become conventional and other with fractured levels of unconventional. Structural diagrams obtained from themesotectonic 1.134 data can recognize a responsible stressfield whose maximum principal stress was placed with NE-SW direction. The potential types of discontinuities able to improve the petrophysical properties of reservoir fluids in the adjacent Claromecó basin are the following fractures: 1) parallel to the stratification, 2) coincident with the cleavage axial plane, 3) dilatant filled by quartz and4) subvertical shear fractures. In the case of interventions of potential reservoirs made from exploration and / or producers wells, they should be preferable directed towards the eastern flanks of the anticlinal structures and close to azimuth N 130°.

Palavras-chave : Geomechanics; Natural fracturing reservoirs; Tunas Formation; Geo-economics resources.

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