Las islas de Providencia y Santa Catalina hacen parte del Departamento Archipiélago de San Andrés, Providencia y Santa Catalina, localizado en la cuenca Los Cayos en el Mar Caribe, al Noroeste de Colombia. Geológicamente las islas se ubican en el Rise de Nicaragua Inferior entre la Fractura de Pedro y el Escarpe de Hess (Rogers et al, 2007). Estas islas están conformadas principalmente por rocas volcánicas de carácter alcalino y calco-alcalino de edad mioceno medio y plioceno respectivamente. Se propone que la evolución geotectónica de la región parte de dos conos volcánicos erosionados cuya historia geológica está íntimamente relacionada con la evolución del Rise de Nicaragua y parte de la Placa Caribe (Rogers et al, 2007; Pindell y Kennan, 2001; Geister y Díaz, 2002). A la isla se le asocian unidades geomorfológicas de costas elevadas y bajas y en ella ocurren procesos morfodinámicos como caída de bloques, deslizamientos y erosión costera que podrían poner en riesgo la población. Económicamente se presenta explotación informal de canteras para agregados y existe la posibilidad de almacenamiento de hidrocarburos en la cuenca Los Cayos.
Shale gas has become a major non-conventional energetical resource. La Luna Formation which is commonly considered as the main petroleum source rock, have also shown to be a major reservoir for shale gas resources. In order to understand the "real" potential of this unit and define exploration strategies, the correlation between compositional and petrophysical patterns. We have analyzed 11 shale samples from La Luna and Conejo Formation in the Middle Magdalena basin and the Eastern Cordillera in order to established its composition, total organic contents, thermal maturity, as well as its total porosity and adsorption capacity. Obtained results suggest that due to its organic content, the presence of quartz and carbonate that these shales have a good quality as a gas reservoir and may have also a moderately good behavior during fracturing.
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