Overburden characterization and post-burn study at the Hanna, Wyoming underground coal gasification site: stratigraphy, depositional environments and mineralogy, Hanna Formation
Several underground coal gasification (UCG) experiments have been conducted in the Hanna No. 1 coal seam. During the fall of 1980 the Laramie Energy Technology Center performed a post-burn field study of the Hanna II, Phases 2 and 3 experiment at the Hanna UCG site. The field work consisted of high resolution seismic, drilling, coring, and geophysical logging. The Department of Earth Resources, Colorado State University, contributed to the post-burn study by doing laboratory work on the cores and geophysical logs. The purpose of the laboratory work was to provide an estimate of the temperatures and chemical conditions reached during the conversion experiment by studying the mineralogical and textural characteristics of thermally altered and ulaltered overburden. In the vicinity of the burn cavity, overburden rocks have been subjected to high temperature pyrometamorphism during the Hanna II Phases 2 and 3 UCG experiments. Paralava rocks, buchites and paralava breccias containing glass and various high temperature minerals such as oligoclase, clinopyroxene, ferrocordierite, mullite, cristobalite, magnetite, and tridymite formed. Textures of some of these minerals suggest crystallization directly from a melt. Mineralogy and melting relations of the paralavas, ash fusion temperatures, and thermocouple measurements made during the experiment suggest that tempratures in excess of 1200/sup 0/C were attained. Rock color and the presence of reduced iron bearing minerals and blebs of native iron indicate that the experimental burn and the product gases in the area of paralava formation were reducing.
- Research Organization:
- Colorado State Univ., Fort Collins (USA); Department of Energy, Laramie, WY (USA). Laramie Energy Technology Center
- DOE Contract Number:
- AT20-80LC10496
- OSTI ID:
- 5386737
- Report Number(s):
- DOE/LC/10496-T1; ON: DE82009053
- Country of Publication:
- United States
- Language:
- English
Similar Records
Depositional environments, subsurface stratigraphy, and post-burn characterization of the Paleocene-Eocene Hanna Formation at the Hanna, Wyoming underground coal-gasification site: Hanna II Phase 1 experiment. [Hanna II; post mortem examination]
Depositional environments, subsurface stratigraphy, and post-burn characterization of the Paleocene-Eocene Hanna formation at the Hanna, Wyo UCG site: Hanna III experiment. [Hanna III post mortem]
Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
BOREHOLES
CAVITIES
COAL GASIFICATION
DATA
EXPERIMENTAL DATA
FEDERAL REGION VIII
GASIFICATION
GEOLOGY
GEOPHYSICAL SURVEYS
IN-SITU GASIFICATION
IN-SITU PROCESSING
INFORMATION
LITHOLOGY
MINERALS
NORTH AMERICA
NUMERICAL DATA
OVERBURDEN
PHASE TRANSFORMATIONS
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SEISMIC SURVEYS
STRATIGRAPHY
SURVEYS
TEMPERATURE MEASUREMENT
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WELL LOGGING
WYOMING