Pre-cretaceous sedimentary sequences of llanos Orientales basin (llo), Colombia
DOI:
https://doi.org/10.32685/0120-1425/bol.geol.52.1.2025.746Keywords:
Play Tectonics, Basin Evolution, Stratigraphy, Palynology
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Abstract
Sedimentary deposition in the Llanos Basin began in open basins of very freezing waters during the Precambrian (Cryogenian - Ediacaran). In the Chiguiro 1 well, it could be observed that there was a continuous sedimentation, passing from the Ediacaran to the Lower Cambrian. The Ordovician was deposited without obstacles throughout the Basin. After a strong tectonic period, sedimentation continued only in the Meta Sunbasin, where small sedimentary patches of Silurian, Devonian and Carboniferous ages have been reported. The Permian has not been observed in the Llanos Basin and probably represents a period of non-deposition or erosion.
In a joint effort between the National Hydrocarbons Agency (ANH) and the Colombian Geological Services (SGC) during the last few years, new information has been acquired (from surface and wells), seismic information has been interpreted and laboratory analysis (petrography, geochemistry, XRD and radiometry) has been performed. This new information has been used to rethink the evolution model of the Eastern Llanos basin. This work shows the exercise carried out with palynological samples from some wells in the study area.
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