Low-BTU Gas in the Permian Chase Group in the Ryersee Field in Western
Kansas: A Case History where Technology Creates a Marketable Commodity
Kansas Geological Survey
Open-file Report 2003-57
Summary and Conclusions
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.
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.
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.
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.
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.
The gas processing facility is one of the smallest of
its type and was not economically feasible even a few years ago.
Additional discoveries of low-BTU gas in the Chase Group
are being made on the Bazine Anticline in the immediate vicinity of Ryersee
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Last updated November 2003