Petroleum Systems of the Vaca Muerta (Tithonian) Formation

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Petroleum Systems of the Vaca Muerta (Tithonian) Formation

Petroleum Systems Charged by the Vaca Muerta (Tithonian) Formation: Neuquén Basin, Argentina WAVREK1, D.A., M.E. LARA2, G.A. LAFFITTE3, S. DEL VO3, J.W. COLLISTER1, J.C. QUICK1, R.B. ALLEN1, D.M. JARVIE4 and H.E. HOLLOWELL5 1E.S.R.I., University of Utah, Salt Lake City, UT 2Lagoven S.A., Caracas, Venezuela 3Y.P.F. S.A., Buenos Aires, Argentina 4H.I.&S., Humble, TX 5Westvaco Resources, Summerville, SC Tithonian (Upper Jurassic) source rock sequences are responsible for a significant volume of petroleum reserves on a global basis. This research defines the petroleum systems within the Neuquén basin that are charged from the Tithonian Vaca Muerta Formation; a unit deposited in a low angle ramp setting that is characterized in seismic and geochemical terms to contain three distinct organic facies. The oil types that correlate to the different organic facies are used to define effective migration pathways. The results indicate that the distal condensed sections are volumetrically significant but physical constraints related to hydrocarbon expulsion and migration contribute to decreased system efficiency. In contrast, the hydrocarbon potential of the shelfal condensed sections have less volumetric significance but exhibit higher efficiency due to the shorter distance required for fracture propagation (i.e., related to the expulsion event) and the effective juxtaposition of migration conduits and/or potential reservoirs. For example, expulsion of hydrocarbons into the underlying Kimmeridgian incised valleys along the Añelo Trough provide a regional migration pathway, whereas expulsion from the top of the unit provides a direct charge into sequences interpreted to represent detached lowstand fans. Migration also occurs towards the Catriel Shelf and the southeastern basin margin along the Intra-Malm unconformity until stratigraphic pinch- out against an impermeable bed provides entrapment. Organic facies deposited within a sulfide-rich water column are identified within the Picún Leufú sub-basin (South Embayment) that generate a hydrocarbon charge at relatively low levels of thermal stress. The sequence of events required for effective hydrocarbon entrapment are demonstrated by time-slice analysis for the Vaca Muerta-Lajas (!), Vaca Muerta-Sierras Blancas/Tordillo/Catriel/Qda. del Sapo (!), and Vaca Muerta-Quintuco/Mulichinco/Loma Montosa (!) Petroleum Systems. .

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