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Low-BTU gas (520 BTU/scf) is present in Permian Chase
Group dolomites at Ryersee Field in Ness County, KS. This gas is structurally
trapped on the Bazine Anticline.
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The major nonhydrocarbon gases accounting for the low-BTU
gas at Ryersee Field are nitrogen (48.6%) and helium (1.4%). The hydrocarbon
component is mostly methane.
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The chemical composition of this gas is different from
Chase-Group gas so prevalent in the giant Permian gas fields of southwestern
Kansas. Instead, it bears a separate affinity to other low-BTU Chase-Group
gas accumulations present on the Central Kansas uplift and Sedgwick basin.
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Low-BTU gases in Permian strata appear to be widespread
in central Kansas and may increase in quality (i.e., BTU/scf) southeastward
of Ryersee Field. Concomitantly, nitrogen and helium content will likely
decrease in that direction.
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Production and upgrading of the low-BTU gas at Ryersee
Field is now being attempted. Both the helium and hydrocarbon component
gases will be sold.
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The gas processing facility is one of the smallest of
its type and was not economically feasible even a few years ago.
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Additional discoveries of low-BTU gas in the Chase Group
are being made on the Bazine Anticline in the immediate vicinity of Ryersee
Field.