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Stratigraphic Analysis of the Valle Morado Area, Northwestern Argentina, New Perspectives (Spanish Presentation)

LACR Andes Basins Research Symposium 2020
AAPG Distinguished Lecture

Author(s): Andrés Alvarez (presenter), Juan I. Hernández, Roberto M. Hernández, Alejandra Dalenz Farjat, Mariano Dellmans, Marcos Costilla, Luis Alvarez, Néstor Navarrete, Ramón Torres, GEOMAP

Presentation is in Spanish

The analysis of the sedimentary record constitutes a key point while assessing the evolution of fold and and thrust belts requiring a multi-variable analysis whose characterization is based on the combination of subsurface data (2D-3D seismic and wells), surface data (mapping and stratigraphic survey) and analytical non-dependent-model techniques such as U-Pb, fission-track and (U-Th-Sm)/He dating.The Valle Morado structure, close to the sub-Andean-Eastern Cordillera boundary in northwestern Argentina, is part of a set of fault-related N-S to NNE-SSW trending anticlines with some plant-view inflections. Located north of the Caimancito field, the Valle Morado anticline was drilled by the Rio Colorado x-1 and Valle Morado x-1001 wells, the latter generating a cumulative production of gas and condensate of 124 Mm3 oil equivalent, in Cretaceous-Paleogene reservoirs (Yacoraite-Mealla; 6044, 5646 MD)(Disalvo, 2002).The integration of surface and subsurface data has allowed a new suitable stratigraphic interpretation in this area located between the southern plunge of the sub-Andean System and the northern edge of the extensional Lomas de Olmedo sub-basin. On the other hand, the analysis of 2D and 3D seismic data in the Miocene-Pliocene deposits allowed to identify a south-to-north thickness increase on a regional scale with its maximum value located between Colonia Santa Rosa, Pichanal and the city of Oran, a low-subsidence position for the Lower Cretaceous, generating a complex subsidence scenario through the Cenozoic. These results generate new analysis perspectives for the understanding of the processes of subsidence, generation and migration of hydrocarbons today trapped in naturally fractured reservoirs in positions such as Valle Morado or Caimancito.


Andrés Alvarez, GEOMAP S.A.

Andrés is a geologist from the Universidad Nacional de Córdoba, Argentina. During his 10 years of experience in the industry, he has worked as geologist in structural and stratigraphy projects for oil and gas industry in the Central Andes (Sub Andean System) for different companies in Bolivia and Argentina (2010-2020).

He currently works at GEOMAP S.A. at Salta, Argentina, where he is responsible for stratigraphic analysis and mapping for the oil and gas industry.

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