Description of underground features from the propagation of short electromagnetic pulses between boreholes

Conference · Thu Apr 01 00:00:00 EST 1982 · Geophysics; (United States)

OSTI ID:6517755

Duff, B M

The system described was developed specifically for location of underground cavities; however, the description of other features such as regions of broken rock or gouge-filled cracks is also possible. These features are characterized by their effect on the propagation of short EM pulses, in particular the change in velocity and attenuation encountered along the path of propagation. The system used consists of separate transmitting and receiving borehole probes. The two probes can be scanned through the boreholes either independently, or simultaneously using a dual-drum wireline winch. Time synchronization of the two probes provides for accurate measurement of the average velocity along the propagation path.

• OSTI ID: 6517755
• Report Number(s): CONF-8110249-
• Journal Information: Geophysics; (United States), Vol. 47:4; Conference: 51. annual international SEG meeting, Los Angeles, CA, USA, 11 Oct 1981
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CAVITIES
ELECTROMAGNETIC SURVEYS
BOREHOLES
DETECTION
ELECTRIC LOGGING
ELECTRIC PROBES
EXPLORATION
GEOLOGIC FISSURES
MAPPING
WAVE PROPAGATION
ELECTRICAL SURVEYS
GEOLOGIC STRUCTURES
GEOPHYSICAL SURVEYS
PROBES
SURVEYS
WELL LOGGING
011000* - Coal
Lignite
& Peat- Reserves
Geology
& Exploration