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Evaluation of Shale Gas in the Paleozoic of the Eastern of Llanos Basin

Alvarado, Ingrid Y.1; Castillo, Luis A.; and Jaramillo, Jose Maria
1[email protected]

Studies in Paleozoic rocks have contributed to stratigraphic analysis, biostratigraphy and evolution of the basin. For this reason, this study presents the evaluation of the conditions for gas potential of shale Paleozoic in the Eastern Llanos Basin, considering the possibility of unconventional energy resources such as shale gas (gas shale).

This study presents the evaluation of the conditions for gas potential of shale Paleozoic in the Eastern Llanos Basin, considering the possibility of unconventional energy resources such as shale gas (gas shale).

The Methodology for this study describes the geological, geophysical and geochemical characteristics of the Paleozoic in the Eastern of Llanos Basin, based on seismic interpretation and information sections of wells that have reached the Paleozoic record. Based on the interpretation different sequences were obtained top and bottom of the Paleozoic and Devonian and isopach. The methodology include: Selection data; loading, selection and interpretation of seismic data, well and geochemistry, Map generation; Gechemical analyses: maps of Ro (%) and (TOC); Modelling of the Eastern Llanos Basin.

The Results, the seismic interpretation allowed the definition of the structural framework, identifying different structural styles and tectonic events that affected the study area from the Paleozoic unconformity at the base of the Paleozoic. In the geochemical characterization, . The average TOC ranges from 0.5 to 2%, Ro values ranging from 0.6 to 0.8, in thermal mature state, which are early generation of oil located in the central part of the basin. Hydrogen index values range from 2 to 181 2mgHC/grTOC. The degree of thermal evolution of organic matter parameter evaluates the maximum temperature (Tmax ° C), which states that the maximum temperature of the organic matter in most wells showed values less than 435 ° C with a thermal maturity level as immature. The reconstruction of the burial history for the foreland area, represents the beginning of the evolution from the Cambrian with a continuous deposition, reaching its peak in the late Ordovician, from this age, begins a process of continuous erosion to the upper Cretaceous, where the decrease in deposition becomes more stable. Late Paleogene begins a period of subsidence extended until mid Neogene, Early Pleistocene rapid starts lifting the layers.

 

AAPG Search and Discovery Article #90166©2013 AAPG International Conference & Exhibition, Cartagena, Colombia, 8-11 September 2013