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Title: High resolution seismic reflection test at the DOE Hanford Site

Abstract

A recent test was conducted to ascertain the benefits of swept source technology for use at the DOE Hanford Site. Previous high resolution seismic surveys suffered from coherent noise interference, poor signal transmission and lack of borehole velocity control. P-wave data were collected with the T-2500 Minivib produced by IVI, Inc. and Oyo Geospace`s DAS-1 acquisition system. Results showed a significant increase m signal-to-noise ratio, increased resolving power and better depth penetration of the signal. It is concluded that swept source technology as part of a total systems approach, significantly expands the capabilities of the shallow high resolution seismic reflection method for use at the DOE Hanford Site.

Authors:
 [1];  [2];  [3];  [4]
  1. Westinghouse Hanford Co., Richland, WA (United States)
  2. Oyo Geospace Engineering Geophysics, Inc., Houston, TX (United States)
  3. Bay Geophysics, Inc., Traverse City, MI (United States)
  4. Industrial Vehicles International, Inc., Tulsa, OK (United States)
Publication Date:
Research Org.:
Westinghouse Hanford Co., Richland, WA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
57604
Report Number(s):
WHC-SA-2784; CONF-950450-6
ON: DE95010851
DOE Contract Number:
AC06-87RL10930
Resource Type:
Conference
Resource Relation:
Conference: 8. annual symposium on the application of geophysics to environmental and engineering problems, Orlando, FL (United States), 23-27 Apr 1995; Other Information: PBD: Apr 1995
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; 58 GEOSCIENCES; HANFORD RESERVATION; SEISMIC SURVEYS; TECHNOLOGY ASSESSMENT; SITE CHARACTERIZATION

Citation Formats

Narbutovskih, S.M., Michelsen, F.B., Clark, J.C., and Christensen, E.W. High resolution seismic reflection test at the DOE Hanford Site. United States: N. p., 1995. Web.
Narbutovskih, S.M., Michelsen, F.B., Clark, J.C., & Christensen, E.W. High resolution seismic reflection test at the DOE Hanford Site. United States.
Narbutovskih, S.M., Michelsen, F.B., Clark, J.C., and Christensen, E.W. Sat . "High resolution seismic reflection test at the DOE Hanford Site". United States. doi:.
@article{osti_57604,
title = {High resolution seismic reflection test at the DOE Hanford Site},
author = {Narbutovskih, S.M. and Michelsen, F.B. and Clark, J.C. and Christensen, E.W.},
abstractNote = {A recent test was conducted to ascertain the benefits of swept source technology for use at the DOE Hanford Site. Previous high resolution seismic surveys suffered from coherent noise interference, poor signal transmission and lack of borehole velocity control. P-wave data were collected with the T-2500 Minivib produced by IVI, Inc. and Oyo Geospace`s DAS-1 acquisition system. Results showed a significant increase m signal-to-noise ratio, increased resolving power and better depth penetration of the signal. It is concluded that swept source technology as part of a total systems approach, significantly expands the capabilities of the shallow high resolution seismic reflection method for use at the DOE Hanford Site.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 1995},
month = {Sat Apr 01 00:00:00 EST 1995}
}

Conference:
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  • Geophysical site characterization studies can be important steps in the process of designing and monitoring remediation at hazardous waste storage facilities. Use of seismic techniques for subsurface characterization at the DOE Hanford Site has been limited. One reason is the lack of borehole velocity control, and low-velocity sediments are highly attenuative. Consequently, standard techniques to provide velocity control are not adequate. Both Vertical Seismic Profiling and reversed VSP surveys are currently being investigated to provide velocity control and for subsurface imaging capabilities. Recently a jet perforating gun was used to perforate a doubled-cased borehole in the 200 West Area. Acousticmore » emissions were recorded from numerous depths to obtain velocity control for a previous surface survey conducted in the same area. Both P- and S-wave data were recorded simultaneously from multiple horizons using the DAS-1 seismograph and 3-component geophones. The data were analyzed for a variety of uses besides velocity control. Signal attenuation was studied as a function of source depth and offset distance to evaluate formation absorption while vertical resolution was determined from the frequency spectrum. Preliminary results indicate that adequate P-wave velocity control can be obtained even though the near-surface sediments are very attenuative. However, we conclude that the perforating gun produces little SH energy. Preliminary velocities indicate that reflection coefficients should be great enough to use surface techniques. Results from the frequency study suggest that a swept source for both surface and borehole surveys may be necessary to obtain required resolutions. Finally, signal attenuation as a function of formation facies suggest that seismic techniques may be useful in mapping perched water zones and for long term vadose zone monitoring.« less
  • Landstreamer Seismic Reflection Vender Report by Confederated Tribes of the Umatilla Indian Reservation and Montana Tech of the University of Montana, collected in FY2009 under CHPRC Contract 35789.
  • Data obtained during site characterization should be useful to assess the need for remediation, to evaluate and design effective remedial plans, and to allow long-term monitoring to discern remediation effectiveness. A valuable environmental tool that incorporates this data is a model that describes groundwater and vadose zone flow and transport characteristics. Data on geology and hydrology combined with information on contaminant sources are incorporated into these conceptual models that delineate the relative significance of the various fluid migration pathways. Downstream these same models also support risk assessment, remediation design, and long-term assessment of remediation effectiveness. Consequently, the building of coherent,more » accurate vadose zone and groundwater models is fundamental to a successful remediation. Among the important requirements for these models is accurate knowledge of flow domain boundaries and soil characteristics. At the Hanford Site, this knowledge is obtained primarily from borehole data, which provides information only at a point. In the high energy flood and fluvial deposits found at the Hanford Site, it can, at times, be difficult to correlate lithologic horizons between boreholes. Where there is no borehole control, our understanding of the geometry of hydrogeologic boundaries and thus of fluid migration paths is limited. Surface geophysical techniques are generally used to provide a measure of geologic control between boreholes. In particular, the seismic reflection method has the potential to provide the greatest resolution of the subsurface hydrogeology between and beyond boreholes.« less
  • No abstract prepared.
  • The use of the shallow high-resolution reflection seismic method for mapping Arapahoe Formation sandstone lenses in the near subsurface at the Rocky Flats Plant near Golden, Colorado, was evaluated using seismic modeling. The modeling helped to determine the feasibility of using the shallow seismic reflection common depth point (CDP) method and to identify potential data acquisition and processing problems. Estimates of vertical and horizontal resolutions were also determined by analyzing the modeling results. The field acquisition parameters for the CDP method were selected after analysis of the synthetic displays. The seismic modeling provided a cost effective method to evaluate themore » feasibility of the shallow reflection method before performing field tests. 7 refs., 1 fig., 1 tab.« less