Electromagnetic burnfront mapping during A. R. Co. 's 1978 in situ coal gasification project. [Rocky Hill, Wyoming project]

Technical Report · Mon Apr 30 04:00:00 EDT 1979

OSTI ID:5934953

Davis, D T; Laine, E F; Lytle, R J; Okada, J T

High-frequency electromagnetic (HFEM) probing was used to map the position of the burnfront in an underground coal gasification experiment conducted by the Atlantic Richfield Company at Rocky Hill, Wyoming. The coal seam in this experiment was 110 ft thick and approximately 700 ft deep, thicker and deeper than the seam probed during a previous gasification experiment at Hoe Creek, Wyoming. Also, the gasification was over a wider area than at Hoe Creek. These different conditions allowed new techniques of HFEM probing to be tried. The authors used lower frequencies to reduce signal attenuations that resulted from the longer cables needed to reach the seam depth and from the longer probing distances. In spite of the low frequencies, the probing results showed good spatial resolution. The greater thickness of the seam allowed a better test of the HFEM lateral-position determination, and this determination also showed good spatial resolution. Other observations of the HFEM technique were consistent with findings from the Hoe Creek experiment.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5934953
• Report Number(s): UCRL-52772
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
COAL GASIFICATION
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
GASIFICATION
GEOPHYSICAL SURVEYS
IN-SITU GASIFICATION
IN-SITU PROCESSING
NORTH AMERICA
PROCESSING
ROCKY MOUNTAIN REGION
THERMOCHEMICAL PROCESSES
USA
WYOMING