Oligocene Sequence Stratigraphy of the Mugrosa Formation from the Llanito Field, Vmm, Colombia
This research worked on the continuity and size of the channel sandstones of Mugrosa Formation and their facies change to floodplain deposits. The results based on the integration of sedimentologic analysis in 111.68 ft drill core of wells ECE-7 and CS-1045 and 250 m from outcrops near to Uribe Uribe, Middle Magdalena Basin propose a series of facies successions that follow specific (A/S) ratio variations. With stratigraphy cycles it determined changes in the base level,in the zones of amalgamated channels and of maximum flood. Outcrops made possible to find true thickness of beds and channels. Stratigraphic correlations from Llanito, Casabe, Gala and Galan fields make possible to observe channel connectivity and continuity to finally recognize sandstone thickness and reservoir quality. Correlations showed amalgamated zones in wich channeling is extended laterally. Mugrosa Formation was deposited on a transitional braided-meandering with lateral facies changes that complicates the hydrocarbon traps. In addition, paleocurrents were not pretty clear. Cross sections cut the formation in all possible directions in order to get a better idea of these paleocurrents. Thickness variation was analyzed and an average was obtained for these sand bodies. compartmentalization on structural traps. In addition, paleocurrents shows same non conclusive results about channel trend direction in several cross sections that cut the formation in all possible directions in order to get a better idea of these paleocurrents. Thickness variation was analyzed and an average was obtained for the channel sand bodies.
AAPG Search and Discovery Article #90090©2009 AAPG Annual Convention and Exhibition, Denver, Colorado, June 7-10, 2009