Título: A Regional Model For Deposition And Erosion Of The Eocene Misoa Formation, Maracaibo Basin, Venezuela

Autor: Knutson, C. A.; Waite, L. E.; Kakizaki, S.

Fuente: Annual. AAPG-SEPM-EMD-DPA-DEG Conv., Pap Abstr P A63, 1997

Lugar y fecha del Evento: Dallas, TX, United States, 4/6-9/97

Descriptores: Venezuela; Depositional Pattern; Erosion (Geology); Event Stratigraphy; Lake Maracaibo Area; Misoa Fm Eocene; Formation Thickness; Stratigraphic Correlation

Año: 1997

Tipo de documento: Conferencia

Resumen: The sandstones of the lower-middle Eocene Misoa Formation contain ca 45% (24 Bbo) of the ultimate recoverable in the Maracaibo Basin. Extreme variations in formation thickness (0 to 15,000 ft) are a combination of depositional onlap and erosional truncation. Stratigraphic position within the Misoa, and hence reservoir behavior, can be difficult to predict. Correlations are not typically based on biostratigraphic data, which is limited. However, placing the traditional stratal units within a sequence stratigraphic framework helps constrain correlations. A sequence-based, genetic depositional model for the Misoa/Pauji succession was constructed using published literature and log motifs from 290 wells. The Misoa/Pauji comprises 3 second-order supersequences within the Tejas I/II supersequence set. The depositional sequences are interrupted and erosionally truncated by the intra-Misoa (49.5 m.y. BP) and top-Pauji (39.5 m.y. BP) unconformities, both tectonic in origin. The subcrop and depositional patterns vary considerably across major fault systems, indicating that large structural blocks within the basin behaved independently and have significantly different depositional and erosional Eocene histories. (Original not available from T.U.)