Overburden characterization and post-burn study of the Hanna IV, underground coal gasification site, Wyoming, and comparison to other Wyoming UCG sites
Analysis of 21 post-burn cores taken from the Hanna IV UCG site allows 96 m (315 ft) of overburden to be subdivided into four local stratigraphic units. The 7.6 m (25 ft) thick Hanna No. 1 coal seam is overlain by a laterally discontinuous, 3.3 m (11 ft) thick shaley mudstone (Unit A') in part of the Hanna IV site. A more widespread, 30 m (90 ft) thick well-indurated sandstone (Unit A) overlies the A' unit. Unit A is the roof rock for both of the Hanna IV cavities. Overlying Unit A is a 33 m (108 ft) thick sequence of mudstone and claystone (Unit B), and the uppermost unit at the Hanna IV site (Unit C) is a coarse-grained sandstone that ranges in thickness from 40 to 67 m (131 to 220 ft). Two elliptical cavities were formed during the two phases of the Hanna IV experiment. The larger cavity, Hanna IVa, is 45 x 15 m in plan and has a maximum height of 18 m (59 ft) from the base of the coal seam to the top of the cavity; the Hanna IVb cavity is 40 x 15 m in plan and has a maximum height of 11 m (36 ft) from the base of the coal seam to the top of the cavity. Geotechnical tests indicated that the Hanna IV overburden rocks were moderately strong to strong, based on the empirical classification of Broch and Franklin (1972), and a positive, linear correlation exists between rock strength and volume percent calcite cement. There is an inverse linear correlation between rock strength and porosity for the Hanna IV overburden rocks. 28 refs., 34 figs., 13 tabs..
- Research Organization:
- Colorado State Univ., Fort Collins, CO (United States)
- DOE Contract Number:
- AS20-83LC11010
- OSTI ID:
- 5800150
- Report Number(s):
- DOE/LC/11010-1772; ON: DE85003381
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
IN-SITU GASIFICATION
CAVITIES
FIELD TESTS
OVERBURDEN
LITHOLOGY
MECHANICAL PROPERTIES
POROSITY
STRATIGRAPHY
CALCITE
COAL GASIFICATION
COAL SEAMS
DRILL CORES
EXPERIMENTAL DATA
SANDSTONES
SILTSTONES
WYOMING
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
COAL DEPOSITS
DATA
FEDERAL REGION VIII
GASIFICATION
GEOLOGIC DEPOSITS
GEOLOGY
IN-SITU PROCESSING
INFORMATION
MINERAL RESOURCES
MINERALS
NORTH AMERICA
NUMERICAL DATA
OXYGEN COMPOUNDS
PROCESSING
RESOURCES
ROCKS
SEDIMENTARY ROCKS
TESTING
THERMOCHEMICAL PROCESSES
USA
010404* - Coal
Lignite
& Peat- Gasification