Sedimentologic Characterization of the Misoa Formation, Integrating Surface – Subsurface Data

Margotta, José A.¹, Ramon A. Rondon¹, Yoleidy Hernandez¹, Carlos J. Saavedra¹ (1) PDVSA-INTEVEP, Los Teques, Venezuela

Sedimentary facies that are defined in studies of outcrops allow to compare locally physical parameters that could be then extrapolated to the subsurface. This study is based in characterizing the facies of the Formation Misoa between surface and subsurface to realize comparisons among the size of grain, selection, sedimentary structures and, besides to generate a methodology that it allows with field studies, to reduce the level of uncertainty for the distribution of the heterogeneities of facies in the subsurface.

On the basis of the characterization textural a wide correlation of the Facies decided, as the sedimentary sequences, which correspond to coastal bars. Of this form this tool allows to have a major visualization of the scales of correlation from obtained information.

The Misoa Formation is located in the West of Venezuela, specifically, in the Maracaibo basin. According to paleontologic and palynologic evidences its age is determined among the Inferior Eocene and Midle Eocene, and lithologically corresponds to a sandy sequence.

The study includes the outcrops that are located in the San Pedro river, Mountainous zone of Trujillo, and several wells of the Ceuta and Barúa fields, respectively.

To elaborate the present work the was realized sedimentological description of cores belonging to the wells before mentioned, the geological raising of outcrop and the petrographic description; besides a correlation of electrical loggings surface - subsurface. These tools as a whole allowed to have a more wide vision of the lateral and vertical variability of the Formation.