Análisis de la fragilidad para identificar sweet spots en formaciones de shale gas
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Universidad Industrial de Santander
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El objetivo de este trabajo es analizar el impacto del índice de fragilidad en el fracturamiento hidráulico de formaciones de shale gas a nivel mundial y defi nir parámetros para identifi car zonas de interés o sweet spots fracturables en shale plays prospectos.
Se realizó una revisión bibliográfi ca de las propiedades petrofísicas y mecánicas que exhiben diversas formaciones de shale gas en países como estados unidos, China, Holanda, noruega, Dinamarca y suecia. una vez estructurada la base de datos, se calcularon índices de fragilidad utilizando diferentes métodos teniendo en cuenta la composición mineralógica y los módulos elásticos estáticos y dinámicos de cada formación de shale estudiada.
El cálculo de índices de fragilidad en profundidad y su relación con el contenido orgánico total permitió identifi car posibles sweet spots para las formaciones de shale gas de mayor prospección. Adicionalmente, el análisis de la relación entre el índice de fragilidad y el comportamiento mecánico de dichas formaciones permitió determinar que fl uido de fractura es el apropiado para utilizar en caso de realizar un fracturamiento hidráulico en la zona de interés.
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.
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 modul, Mineralogy, Sweet spot, Shale gas, Fracturamiento hidráulico, Indice de fragilidad, Módulos elásticos, Mineralogía, Sweet spot