Petroleum Geology of the Cusiana Field, Llanos Basin Foothills, Colombia

Chapter 3

“…The lack of significant Phanerozoic grains indicates very limited erosional input from the present-day Central or Eastern Cordilleras. These results confirm a pre-Andean extensional to post-extensional landscape involving west-directed sediment dispersal from cratonic sources uniformly across all three basin sectors-the Llanos Basin, Eastern Cordillera, and Magdalena Valley-as interpreted by many previous studies on the basis of lateral facies changes, thickness trends, and paleocurrents (Toussaint & Restrepo, 1994;Cazier et al, 1995;Cooper et al, 1995;Villamil, 1999;Sarmiento-Rojas et al, 2006).…”

“…The Eastern Cordillera of Colombia (Figure 1) forms a major topographic barrier in the northern Andes that profoundly influences climate, erosion, and the delivery of clastic sediment to major rivers and continental-margin deltas, including the Magdalena, Orinoco, and Amazon drainage systems (Hoorn et al, 2010(Hoorn et al, , 2017Mora et al, 2010a;Anderson et al, 2016). Construction of the Eastern Cordillera also guided the evolution of major sedimentary basins across the northern Andes, including the Magdalena Valley and Llanos Basins, sources of considerable hydrocarbon resources (Morales, 1958;Van Houten & Travis, 1968;Van Houten, 1976;Dengo & Covey, 1993;Cazier et al, 1995;Cooper et al, 1995;Gómez et al, 2003Gómez et al, , 2005aGómez et al, , 2005bParra et al, 2009aParra et al, , 2009bMora et al, 2010b;Londono et al, 2012).…”