Paleogeography and sedimentology of fluvial point bars, chute-fills and oxbow-fills in the lower Liard River, NWT. ...

• Main Author: Piet, Leona J. M.
• Format: Master Thesis
• Language: English
• Published: University of Calgary 1992
• Subjects: QE 501 P3 P53 1992a; Additional Copy QE 501 P3 P53 1992; Paleogeography - Northwest Territories; Glacial landforms - Northwest Territories; Glacial erosion - Northwest Territories; Sediment transport - Northwest Territories; Alluvium - Northwest Territories; Liard River; Northwest Territories
• Online Access: https://dx.doi.org/10.11575/prism/19106; https://prism.ucalgary.ca/handle/1880/31161

Bibliography: p. 101-107. ... : The sedimentology and geometry of chute and oxbow channel-fills deposited by meandering rivers are poorly understood. In the ancient fluvial rocks, oxbow-fill deposits are conceptually important stratigraphic traps for small oil and gas prospects and reservoirs in the subsurface. This concept advocates the notion that clay-filled oxbow lakes provide a lateral seal which contains sandy point bar deposits. Why some oxbow traps contain hydrocarbons while others don't has concerned exploration geologists. This study is an attempt to help answer this question by describing the sedimentology and morphology of point bars, chute channel-fills and oxbow-fills in Holocene meandering channel deposits. Terraces up to 18 m high, flanking most reaches of the modern Liard and South Nahanni rivers, NWT, consist of Holocene (5750 BP± 60; GSC-4103) meandering river sediments. Fresh cutbanks have exposed the internal sedimentary anatomy of the river channel: point bar, chute channel-fill and oxbow-fill deposits. The surficial ...