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• W1906403984 abstract "ABSTRACT In northeastern Alberta, the Grand Rapids Formation comprises the upper part of the regressive Upper Mannville Group and consists dominantly of thick sandstones. Regional correlations to the south show that the sands were fed from a number of incised valleys cutting the Waseca, McLaren and Colony formations of the Lloydminster area. The Grand Rapids sandstones are therefore falling and lowstand sea level deposits which offlap from surfaces equivalent to updip unconformities. Six allostratigraphic units defined on the basis of regressive surfaces of erosion cut at the bases of shorefaces and transgressive surfaces at their tops have been defined. Each offlapping allostratigraphic unit consists in the south of thin channel and crevasse-splay sands grading northward into major shoreface sands. The largest sandstones are very extensive, reaching dimensions of 100 km by 200 km by 50 m thickness because they are composite, consisting of several individual shoreface sands as well as incised valley fills. Individual sands within these larger composite bodies extend seaward from a few kilometres to a few tens of kilometres before clinoforming and terminating northward by downlap. They thin southward with abrupt facies terminations into finer-grained deposits. Alongshore, individual shoreface sands onlap against other sands discharged from different incised valleys or, to the west, against finer-grained Upper Mannville successions. Relative sea level fluctuations caused valley incision and amalgamation of shoreface sandstones. As a result of the lack of seals, the largest reserves of hydrocarbons (both bitumen and gas) have generally not accumulated in the thickest sandstones but in the thinner uppermost sandstone which is effectively blanketed by the overlying Joli Fou Shale. Hydrocarbons may be trapped in the lower sandstones in situations where the intervening shales have been preserved to form an effective seal. The bitumen generally is trapped to the north of the major gas fields. Many of the largest gas reserves occur in small drape structures that occur because of postsedimentary dissolution of Devonian salt. Smaller pools occur in stratigraphic traps where permeable shoreface sandstones terminate updip because of facies changes. RESUME Dans le nord-est de l'Alberta, la Formation Grand Rapids englobe la partie superieure du groupe Mannville superieur en regressivite et consiste surtout de gres epais. Les correlations regionales vers le sud indiquent que les sables ont ete alimentes par des vallees encaissees tranchant les formations Waseca, McLaren et Colony de la region de Lloydminster. Les gres de Grand Rapids par consequent s'effondraient et des depots au plus bas niveau de la mer en regressivite de surfaces equivalentes a des discordances en amont-pendage. Six unites allostratigraphiques definies selon les surfaces d'erosion en regressivite tranchees a la base de zones infratidales et des surfaces transgressives a leur sommet ont ete definies. Chaque unite allostratigraphique en regressivite consiste au sud de gres fluviatile mince et de crue causee par une fissure qui se nivelle vers le nord jusqu'a la zone importante infratidale de gres. Les gres les plus importants en dimension peuvent atteindre des dimensions de 100 km par 200 km par 50 m d'epaisseur parce qu'ils sont composes de plusieurs gres individuels de zones infratidales ainsi que de vallees taillees remplies. Les gres individuels parmi les masses composees les plus importantes s'etendent vers la mer de quelques kilometres a quelques dizaines de kilometres avant de prendre la forme de talus subaquatique et de se terminer vers le nord par des couches inclinees sur discordance. Ils se terminent en biseau vers le sud avec des facies qui se terminent abruptement en depots a grains plus fins. Le long du rivage, les gres individuels des zones infratidales se chevauchent contre d'autres gres provenant de vallees encaissees ou, a l'ouest, contre des successions de grains plus fins du Mannville superieur. 1 Geological Survey of Canada Contribution No. 1996508 End_Page 141------------------------ Les variations relatives du niveau de la mer ont cause l'encaissement de vallees et l'alliage des gres de zones infratidales. A cause du manque d'obturations, les plus grandes reserves d'hydrocarbures (bitume et gaz naturel) ne sont pas generalement accumulees dans les gres les plus epais, mais dans les gres les plus minces des couches les plus superieures recouvertes par le schiste Joli Fou. Les hydrocarbures peuvent etre pieges dans les gres inferieurs lorsque les schistes qui traversent ont ete conserves de facon a former une obturation solide. Le bitume est generalement piege au nord des champs petroliferes importants. Plusieurs des plus grandes reserves de gaz se situent dans des structures de petites draperies qui sont presentent a cause de la dissolution pre-sedimentaire du sel devonien. Les plus petits gisements se produisent dans les pieges stratigraphiques ou les gres permeables de zones infratidales se terminent en amont-pendage a cause des changements de facies. Traduit par Marie-Louise Tomas" @default.
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• W1906403984 date "1997-06-01" @default.
• W1906403984 modified "2023-09-26" @default.
• W1906403984 title "Regional Stratigraphy, Sedimentology and Petroleum Geology of the Grand Rapids Formation, Mannville Group, Northeastern Alberta" @default.
• W1906403984 doi "https://doi.org/10.35767/gscpgbull.45.2.141" @default.
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