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The AAPG/Datapages Combined Publications Database
Williston Basin Symposium
Abstract
SKGS-AAPG
Eighth International Williston Basin Symposium, October 19, 20, and 21,
LINEAR
AND ARCUATE SAND BODIES IN THE UPPER MANNVILLE OF THE CELTIC AREA, SASKATCHEWAN
ABSTRACT
In west-central Saskatchewan the Sparky and General Petroleums (G.P.) "members" of the Lower Albian Upper Mannville Group
include several sequences of shales and sands capped by coal. Mobil's successful horizontal wells in the Celtic Field were
completed using SAGD (Steam Assisted Gravity Drainage) production technology that necessitated a rigorous examination of reservoir
geometry. Some exploration and development models include the assumption that Upper Mannville valley-fill resulted from meandering
rivers. This analysis has resulted in the recognition of linear
and arcuate sand and shale depositional patterns in the valley-fill
in the northwest part of the Celtic Field, at least some of which are probably estuarine.
The Sparky and General Petroleums members in the Celtic Field comprise "regional" clastics and valley-fill sediments. The
regional strata are deeply dissected in two places: in the centre of the field by a narrow channel and in the northwest of
the field by a parallel, broader valley. The northwestern sand bodies are linear
or arcuate in form and parallel or sub-parallel
to the valley margins. Some appear as small clinoforms and others resemble longitudinal bars in an estuary. The thicker sand
bodies are up to 600 m wide and more than 2 km long. Prairie Evaporite dissolution produced collapse features clearly defined
on the karstic Duperow surface before and during Mannville deposition but had little influence on the G.P. and Sparky sand
and shale orientation.
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