Hydrocarbon Generation, Migration
and Accumulation Related to Igneous Intrusions: An Atypical Petroleum System from the Neuquen Basin of Argentina
Felipe Rodríguez1, Héctor J. Villar2, and Roger Baudino3
1Exploración Argentina Onshore, REPSOL-YPF, Talero 360 (8300) Neuquén, Argentina [email protected]
2Departamento de Ciencias Geológicas - FCEyN – Universidad de Buenos Aires - Conicet, Buenos.Aires, Argentina
3Gerencia de Exploración Brasil, REPSOL-YPF, Praia de Botafogo 300, 7 Andar (22250-040) Rio de Janeiro, Brasil
The stratigraphic record of the Altiplanicie del Payún area, in the Northern Platform of the Neuquén Basin, Argentina, includes Tertiary sills and laccolites that reach thicknesses of up to 600 m. Occurrence of thermally immature oil-prone shales of the Late Jurassic Vaca Muerta and the Hauterivian Agrio Formations is profusely documented in the area. However, when sills have intruded the Vaca Muerta shales, source rock sections become mature, displaying a wide-ranging maturity spectrum spanning thicknesses that exceed 400 m.
Commercial oil accumulations (20-33°API) and oil shows are found along the entire column, both in sandstone/carbonate reservoirs and fractured intrusives reservoirs. Oil-oil and oil-source rock correlations suggest a local generation related to the thermal













AAPG Search and Discover Article #90066©2007 AAPG Hedberg Conference, The Hague, The Netherlands