Abstract
ABSTRACT A series of Glauconitic Member and post-Glauconitic or channel systems has been mapped over a large area of southern Alberta. Channel trends were identified by a channel-like character on well logs and the absence of the typical regional Ostracod succession. Glauconitic channel sandstones are highly quartzose and form excellent reservoirs. They are commonly associated with a thick mudstone fill which complicates the internal reservoir geometry. Lithic channel sandstones, in contrast, form poor reservoirs due to the presence of abundant feldspathic and lithic sand grains which, upon compaction and alteration to clay minerals, severely reduces reservoir quality. Lithic channels commonly followed the trend of earlier Glauconitic channels, preferentially eroding the less-resistent mud-filled facies. Glauconitic channel systems flowed northward feeding quartzose shoreface complexes in the Hoadley area. Lithic channels followed similar trends to a feldspathic shoreface complex in the Drayton Valley area. RESUME Une serie de systemes de chenaux du membre Glauconitic, et post-Glauconitic ou a ete cartographiee sur une grande etendue dans le sud de l'Alberta. Des directions generales de chenaux furent identifiees par un aspect de chenal des courbes de diagraphies, et l'absence de la succession Ostracod regionale typique. Les gres de chenaux Glauconitic sont tres quartzeux et forment d'excellentes roches reservoirs. Ils sont communement associes a un epais remblai de schiste argileux qui complique la geometrie interne de la roche reservoir. Les gres de chenaux lithiques, par contraste, forment des roches reservoirs de pauvre qualite a cause de la presence de grains de sable feldspathiques et lithiques qui, apres compaction et transformation en mineraux argileux, reduisent serieusement la qualite du reservoir. Les chenaux lithiques suivirent bien souvent l'orientation des chenaux Glauconitic anterieurs, erodant de preference les facies argileux moins resistants. Les systemes de chenaux Glauconitic s'ecoulerent en direction nord, alimentant les complexes quartzeux de la zone infratidale dans la region de Hoadley. Les chenaux lithiques suivirent des orientations semblables a celles d'un complexe de zone infratidale feldspathique dans la region de Drayton Valley. Traduit par Marc Charest.
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