Sandstone basin margin

There are some differences to be noted in the proportion of trace elements in the basin margin cements compared with those of the central basin. High proportions of Mn and/or Fe are found only in meteoric cements (Boles Ramseyer, 1987 Fischer Surdam, 1988). Further studies have shown that meteoric cements may also have Mg as the dominant trace element (Hayes Boles, 1993). This latter work also showed that the trace element distribution of basin margin calcites appears to vary on a reservoir scale. Thus, the proportion of Mg-Mn-Fe is distinctly different in calcite cements of the Vedder sandstone from Mount Poso and Round Mountain fields, even though they are interpreted to have formed at a similar time (i.e. burial temperature). As concluded by Hayes Boles (1993), local reactions in the reservoir are occurring at a faster rate than potential mixing processes between these reservoirs. 

Table 1. Examples of major carbonate-cemented zones as identified from sonic and bulk density logs and lithological descriptions of cuttings for a variety of structures in dilferent parts of the Eromanga basin (Fig. lA). Note that the carbonate-cemented zones in Jurassic sandstones vary in cumulative thickness, from a few metres (e.g. Strzelecki-10) to about 110 m (Spencer West-1), including over short distances (e.g. Strzelecki). All wells occur near the Cooper basin margin, or along major fault-bounded structural trends where the regional Nappamerri Group seal (Triassic) underlying the Jurassic sandstones is incompetent or missing...

More than 30 years ago it became apparent that sandstones of the Athabasca Basin in Saskatchewan are host to significant deposits of uranium. Previous work elsewhere, primarily in the Colorado Plateau (Cannon 1964) and the former Soviet Union (Kovalevsky 1972), had shown that plants are capable of accumulating high concentrations of U. Surveys near the eastern margin of the Athabasca Group revealed an area of... 

The Rose Run Sandstone is the best characterized of the Cambrian sandstones because it is also an oil and gas reservoir (Fig. 3). It is also the only one of the Cambrian sandstones that is known to retain its sandstone composition in the eastern part of the state rather than passing laterally into carbonate. The Rose Run Sandstone is a sandy layer in the middle of the Knox Dolomite (Fig. 4), which across much of eastern Ohio lies at depths suitable for injection of supercritical C02 (Fig. 3). The Rose Run Sandstone was deposited in a passive margin phase of the Appalachian Basin and consists of interbedded layers of carbonate, primarily dolos-tone, and sandstone (Fig. 5). The sandstone is compositionally mature, consisting largely of quartz. Subordinate reactive minerals are the alkali feldspars and locally abundant glauconite (Fig. 5). Dolomite and quartz are the dominant cements (Janssens 1973 Riley et al. 1993). 

Lagoe, M.B. (1987) The stratigraphic record of sea level and climatic flucuations in an active margin basin the Stevens Sandstones, Coles Levee area, California. Palaios, 2, 48-68. 

In the Lower Cretaceous (Berriasian-Albian) Hibernia to Avalon/Ben Nevis formations, which contain the main reservoir levels of the Hibernia Field (the 200 m thick Hibernia Sandstone and the 150 m thick Catalina Member of the Whiterose Formation, as well as the up to 800 m thick Avalon/Ben Nevis Sandstone), the shift to elastic-dominated marginal-marine and marine sedimentation occurred, as rifting continued in the Grand Banks region. Most of the detrital material was derived from elevated areas to the west (Bonavista Platform Figs 1 and 3) and southwest (Avalon Uplift Jansa Wade, 1975) of the Jeanne d Arc basin, but also from uplifted and... 

Most of the major sandstone deposits are Mesozoic and Caenozoic. This is doubtless because rocks of this age contain the great piles of continental and marginal marine sandstones and the required periods ofweathering and erosion. Most of the uranium introduced to Palaeozoic marine basins yielded little better than weakly mineralized black shales because of the lack of an efficient concentrating mechanism. 

Oil in the small Lyons Sandstone reservoirs along the northwest margin of the Denver Basin has distinctly different characteristics than oil in the Cretaceous reservoirs. The source for the Lyons oil is unknown. The source for the oil in the Lower and Upper Cretaceous reservoirs has been established as Cretaceous shales and limestones (Clayton and Swetland 1980) by oil-to-rock correlation techniques. The Carlile Shale, Greenhorn Limestone,... 

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