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RESUMEN el objetivo de este trabajo es analizar el impacto del indice de fragilidad en el fracturamiento hidraulico de formaciones de shale gas a nivel mundial y defi nir parametros para identifi car zonas de interes o sweet spots fracturables en shale plays prospectos. Se realizo una revision bibliografi ca de las propiedades petrofisicas y mecanicas que exhiben diversas formaciones de shale gas en paises como estados unidos, China, Holanda, noruega, Dinamarca y suecia. una vez estructurada la base de datos, se calcularon indices de fragilidad utilizando diferentes metodos teniendo en cuenta la composicion mineralogica y los modulos elasticos estaticos y dinamicos de cada formacion de shale estudiada. El calculo de indices de fragilidad en profundidad y su relacion con el contenido organico total permitio identifi car posibles sweet spots para las formaciones de shale gas de mayor prospeccion. Adicionalmente, el analisis de la relacion entre el indice de fragilidad y el comportamiento mecanico de dichas formaciones permitio determinar que fl uido de fractura es el apropiado para utilizar en caso de realizar un fracturamiento hidraulico en la zona de interes. Palabras clave: shale gas, fracturamiento hidraulico, indice de fragilidad, modulos elasticos, mineralogia, sweet spot. Brittleness analysis to identify sweet spots in shale gas formations ABSTRAC The purpose of this paper is to analyze the impact of the Brittleness index in hydraulic fracturing on shale gas formations worldwide, and thereby defi ne parameters to identify fraccable feasibly sweet spots in prospects shale plays. A literature review was made so as to gather the largest amount of petrophysical and mechanical data from shale gas formations from countries all over the world such as United States, China, Holland, Norway, Denmark and Sweden. Once available the data, different methods were used to calculate the brittleness index of each study case considering the effect of the mineralogical composition and elastic moduli (static and dynamic). The relation between the brittleness index at depth and the total organic carbon allowed to identify possible sweet spots within each prospect formation. Additionally, the analysis of brittleness index and mechanical behavior of those formations permitted to stablish which fracture fl uid should be used in case of a hydraulic fracturing stimulation at the sweet spot. Keywords: shale gas, hydraulic fracturing, brittleness index, elastic moduli, mineralogy, sweet spot

ANÁLISIS DE LA FRAGILIDAD PARA IDENTIFICAR SWEET SPOTS EN FORMACIONES DE SHALE GAS