The Lloydminster oil and gas field, Alberta
Date
1959-04
Authors
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ORCID
Type
Degree Level
Masters
Abstract
In the Lloydminster area, oil and gas are produced
from the deltaic sands of the Lower Cretaceous Mannville Group, which
has been subdivided into three formations; Dina, Silverdale and Colony,
respectively. The subdivisions were based on slight lithological
variations reflecting minor changes in the environment of deposition
and the source of sediments. The deposits of the Dina Formation are non-marine beach sands, having little economic importance.
They are overlain by mostly marine sediments of the Silverdale Formation,
which contains the main oil producing horizons, the Sparky
and General Petroleum Sand Members. Most of the gas is produced
from the upper sands of the non-marine Colony Formation.
The oil was formed "in situ" and accumulated in two
types of traps, i.e., a number of simple convex traps resulting from
differential thickness and permeability pinch-out traps. The development
of channel systems on the delta front by tidal action formed the
trap conditions. The oil was probably produced by the chemical transformation
of the humic acid, transported by streams from the marginal
alluvial plains of Lower Cretaceous times to the delta front. There
the acid was precipitated out and settled in the bottom sands and
bars of the channel system. When the strata of the Mannville were
tilted towards the Rocky Mountain Geosyncline during the Laramide
and later orogenies, same of the oil from the area soutwest of Lloydminster probably migrated up dip and gathered in the traps in the
Lloydminster region, thus adding to the reserves of this area.
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Degree
Master of Science (M.Sc.)
Department
Geological Sciences
Program
Geological Sciences