Kansas Geological Survey, Open-file Report 2008-25
by
K. David Newell
KGS Open File Report 2008-25
January 2009
Seven three-inch diameter core samples from the Pennsylvanian Marmaton and Cherokee Groups were collected from the Layne-Christensen #16-1 Pierce well, NE SE SW sec. 16, T. 31 S., R. 17 E., Montgomery County, KS from May 28 to May 31, 2003. The following as-received gas contents were measured, based on the dry weight of the sample:
| 471.0' to 471.8' | Lexington "B" coal | 139.5 scf/ton |
| 569.0' to 570.0' | Excello Shale | 40.0 scf/ton |
| 571.1' to 572.0' | Mulky coal | 188.1 scf/ton |
| 875.5' to 876.4' | Dry Wood | 189.9 scf/ton |
| 910.7' to 911.4' | Neutral(?) | 110.7 scf/ton |
| 982.0' to 983.0' | Riverton coal | 144.2 scf/ton |
| 983.0' to 984.0' | Riverton coal | 74.1 scf/ton |
Analyses of five desorbed coal gases indicate that they are dry gases, ranging from 952 to 1041 BTU/scf. Nitrogen and carbon dioxide are the major non-combustible component gases. Carbon dioxide contents range from 1.4% to 3.6%. Isotopic analysis indicate the gas is mixed thermogenic and biogenic in origin.
Based on gas content, density, and thickness measurements, the gas-in-place
estimates for the respective units are:
| unit gas per acre (thousand cubic ft) |
|
| Lexington "B" | 345.2 |
| Excello Sh. | 399.4 |
| Mulky | 347.8 |
| Dry Wood | 289.2 |
| Neutral(?) | 111.4 |
| Riverton | 467.7 |
The Layne-Christensen #16-1 Pierce well; NE SE SW 16-T.31S.-R.17E., Montgomery County, KS, was selected for desorption tests in association with an on-going coalbed-gas research project at the Kansas Geological Survey. The samples (3-inch-diameter cores) were gathered from May 28, 2003 to May 31, 2003 by K. David Newell of the Kansas Geological Survey, with assistance by Jim Stegeman of Colt Energy. Samples were obtained by wireline coring on a rig owned by Layne-Christensen, Canada.
Bottom-hole times (i.e., the time the core sample was lifted from the bottom
of the hole) and canistering times (i.e., the time the sample was placed in
the desorption canister) were noted in order to determine lost gas and start
of desorption. Approximate wet weight of the sample was determined by subtraction
of the weight of the empty canister from the weight of the canister with the
sample in it. After the sample was removed from the canister, it was weighed
again before air-drying, then weighed after drying. The weight loss is noted
in the desorption table.
Report is in PDF format
Complete Report or In Sections - Report | Figures | Desorption Readings | Appendix
Kansas Geological Survey, Energy Research
Updated January 2009
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