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- W1496589192 abstract "Biogenic gas is produced from shallow, low-permeability sandstones in the Upper Cretaceous Belle Fourche and Greenhorn formations in southern Alberta, southwestern Saskatchewan, and north-central Montana (Figure 1). Reservoirs are most productive where they are associated with largeor small-scale structures, but lack the downdip water contact normally associated with conventional gas accumulations. The lack of a conventional water drive, the occurrence of the gas in low permeability rocks, and its seemingly pervasive (although not always economic) presence throughout the host formations suggest that these gas accumulations fit the criteria for continuous gas accumulations set forth by the U.S. Geological Survey (Schmoker, 1996). Regional correlations of the Belle Fourche and Greenhorn formations are shown in Figure 2. Using these correlations, most of the shallow biogenic gas production is assigned to the Belle Fourche Formation in Canada and Montana, although in Canada, the producing sands are commonly called the Second White Specks sandstones by industry. In Alberta, the most northerly production is in distal sands of the upper Belle Fourche depositional system that interfinger with coccolithic shale. This coccolithic shale occurs below the bioclastic limestone that defines the base of the Second White Specks Formation (Bloch and others, 1993). The base of the limestone represents an unconformity between the Belle Fourche and the Second White Specks Formation in Alberta, Saskatchewan, and northern Montana. The Belle Fourche was deposited as a progradational sequence during an overall sea level rise. As such, older units should pinch out and condense basinward (north) and should be overlain by successively younger strata. During maximum transgression (Greenhorn sea), basinal rocks (Bridge Creek-Keld-Second White Specks) would overlie these younger strata. Because the upper Belle Fourche was deposited below wave base, it would not be truncated by the transgressing sea. However the observed pattern of facies distribution in the Belle Fourche in southeastern Alberta, southern Saskatchewan, and northern Montana does not show progressive downlapping of younger Belle Fourche strata on older facies of the Belle Fourche. Instead, the upper Belle Fourche appears to be progressively truncated to the north under the Second" @default.
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- W1496589192 date "2000-01-01" @default.
- W1496589192 modified "2023-09-23" @default.
- W1496589192 title "EXPANDED ABSTRACT: Interplay of Structure, Facies, and Unconformities on Sites of Biogenic Gas Accumulation in Upper Cretaceous Belle Fourche and Greenhorn Formations— Alberta, Saskatchewan, and Montana" @default.
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