Evaluación petrofísica de areniscas fluviales. El ejemplo del Triásico en el sector de Alcaraz (Albacete)
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Abstract
El conjunto de capas rojas triásicas de la Cobertera Tabular de la Meseta
Ibérica constituye un análogo aflorante de reservorios de hidrocarburos de
origen fluvial, como el TAGI argelino (Trias Argilo-Greséux Inferieur). El ejemplo
de Alcaraz (Albacete) está constituido por cuerpos de arenisca embebidos
en sedimentos finos que son el resultado del depósito en diferentes ambientes
y subambientes sedimentarios. Una primera evaluación de las propiedades
petrofísicas de los cuerpos areniscos de la denominada secuencia
II y parte de la IV, ha puesto de manifiesto las heterogeneidades existentes
entre los diferentes elementos arquitectónicos, así como dentro de los propios
cuerpos. Así, se han obtenido diferentes valores de porosidad abierta,
permeabilidad y coeficiente de anisotropía en función de la secuencia y del
ambiente depósito. Además, ensayos hídricos han mostrado la dependencia
del valor de ciertos parámetros petrofísicos de las propiedades de viscosidad
y densidad del fluido con el que interacciona la roca
The Triassic Red Beds of the Tabular Cover of the Iberian Meseta represent an outcropping analogue of fluvial hydrocarbon reservoirs such as the algerian TAGI (Trias Argilo-Greséux Inferieur). The example of Alcaraz (Albacete) is constituted by sandstone bodies embedded in fines, as consequence of the deposit in different sedimentary environments and subenvironments. An evaluation of the petrophysical properties of the sandy bodies of the sequence II and part of the IV has revealed the heterogeneities between the different architectural elements, as well as within the same body. Thereby, different values of open porosity, permeability and anisotropy coefficient were obtained, as function of the sequence and the environment of deposit. In addition, hydric tests have shown the relation between some petrophysical parameters values and the properties of viscosity and density of the fluid that interact with the rock
The Triassic Red Beds of the Tabular Cover of the Iberian Meseta represent an outcropping analogue of fluvial hydrocarbon reservoirs such as the algerian TAGI (Trias Argilo-Greséux Inferieur). The example of Alcaraz (Albacete) is constituted by sandstone bodies embedded in fines, as consequence of the deposit in different sedimentary environments and subenvironments. An evaluation of the petrophysical properties of the sandy bodies of the sequence II and part of the IV has revealed the heterogeneities between the different architectural elements, as well as within the same body. Thereby, different values of open porosity, permeability and anisotropy coefficient were obtained, as function of the sequence and the environment of deposit. In addition, hydric tests have shown the relation between some petrophysical parameters values and the properties of viscosity and density of the fluid that interact with the rock
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