Permeability changes in coal resulting from gas desorption

Technical Report · Wed Jan 01 00:00:00 EST 1992

DOI:https://doi.org/10.2172/6812549· OSTI ID:6812549

Levine, J. R.; Johnson, P. M.

During this quarter, work was continued on measuring the methane sorption capacity of dispersed organic matter in gas shales and maceral concentrates derived from a Kentucky coal. Although previous results have demonstrated that the microbalance technique is successful in generating sorption isotherm curves, the accuracy of the technique has not been well established. The only previous test that allowed a comparison between gravimetric data and volumetric data showed a significant discrepancy with the gravimetric data indicating a considerably greater sorption quantities than the volumetric data. During the present quarter we took advantage of an opportunity to join in a round-robin analysis of sorption capacity of carbonatious shales. A suite of four samples was sent to six laboratories with each lab measuring sorption capacity for methane and reporting the results to a central lab which would compile all of the data for comparitive purposes. Of course, none of the other laboratories were using the gravimetric approach for measuring methane sorption capacity. So this provides a unique opportunity to test the accuracy of our methods.

• Research Organization: Alabama Univ., University, AL (United States). Dept. of Geology
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-89PC89764
• OSTI ID: 6812549
• Report Number(s): DOE/PC/89764-T12; ON: DE93006433
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
SORPTIVE PROPERTIES
METHANE
ADSORPTION
SHALES
ADSORPTION ISOTHERMS
EXPERIMENTAL DATA
HELIUM
INTERLABORATORY COMPARISONS
MACERALS
PERMEABILITY
PROGRESS REPORT
ALKANES
CARBONACEOUS MATERIALS
DATA
DOCUMENT TYPES
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
HYDROCARBONS
INFORMATION
ISOTHERMS
MATERIALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
RARE GASES
ROCKS
SEDIMENTARY ROCKS
SORPTION
SURFACE PROPERTIES
010600* - Coal
Lignite
& Peat- Properties & Composition