NDLI: Use of a Multi-offset Borehole-radar Reflection Method in Fractured Crystalline Bedrock at Mirror Lake, Grafton County,

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Use of a Multi-offset Borehole-radar Reflection Method in Fractured Crystalline Bedrock at Mirror Lake, Grafton County,

Content Provider	Semantic Scholar
Author	Lane, J. W. Haeni, F. Peter Versteeg, Roelof Jan
Copyright Year	1998
Abstract	Multi-offset, single-hole, borehole-radar reflection surveys were conducted at the U.S. Geological Survey Fractured Rock Research Site at Mirror Lake, in Grafton County, New Hampshire. The study was conducted to evaluate the benefits of applying multi-offset seismic processing techniques to borehole-radar reflection surveys in fractured rock. The multi-offset reflection surveys were conducted in conjunction with a saline tracerinjection experiment. During injection, a sodium chloride (NaCl) solution was continuously pumped into a hydraulically conductive zone that was isolated by specially constructed, reusable, PVC straddle packers suspended from PVC casing. Eight common-offset borehole reflection profiles were collected within the PVC-sleeved portion of the borehole before and during the tracer injection. The offset between the transmitter and receiver antennas ranged from 6.4 to 9.9 m (meters). The common offset data were filtered, sorted into common distance-point (CDP) gathers, normal move-out (NMO) corrected, and stacked to produce a zero-offset borehole CDP profile. Comparison of the common-offset and CDP profiles indicates that multi-offset data acquisition and CDP processing; (1) increases the resolution of reflectors near the borehole, (2) decreases the effects of direct wave coupling, antenna ringing, and system noise, and (3) improves the clarity of difference images used to identify the effects of saline tracer on reflections from transmissive fractures.
File Format	PDF HTM / HTML
DOI	10.4133/1.2922522
Alternate Webpage(s)	https://water.usgs.gov/ogw/bgas/publications/SAGEEP98_038/SAGEEP98_038.pdf
Alternate Webpage(s)	https://doi.org/10.4133/1.2922522
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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