Fact Sheet 2008-3098

2008


Borehole Geophysical Logging Program: Incorporating New and Existing Techniques in Hydrologic Studies

Michael A. Wacker and Kevin J. Cunningham



COVER OF REPORT

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CONTENTS
Overview
New Borehole Geophysical Logging Capabilities in Florida
FISC Hydrologic Investigations Employing Borehole Geophysical Logging Techniques
      Hydrogeologic Framework Studies
      Aquifer Flow-Zone Characterization
      Freshwater-Saltwater Interface Delineation
References Cited

Figure 1. Temporal change in borehole temperature caused by the migration of a tracer within a touching-vug flow zone at a depth of 41 feet below land surface in an observation well (modified from Renken and others, 2008). Tracer injection occurred at 0930 hours. Fluid temperature log at 1252 hours was not completed because the top of the logging tool was lodged against the casing bottom.
Figure 2. Comparison of borehole image, computed vuggy porosity, geophysical, and flowmeter logs for the G-3788 test corehole showing evidence of water outflow from the borehole into a preferential flow zone. Abbreviation ÁS/cm is microsiemens per centimeter.
Figure 3. Comparison of electromagnetic-induction logs collected in well G-3702 from April 2000 through May 2007 along Black Creek Canal in Miami-Dade County (Scott Prinos, U.S. Geological Survey, written commun., 2008). An increase in conductivity is evident between 40 and 50 feet.
Table 1. Available geophysical logs for use in FISC research.

Abstract

The borehole geophysical logging program at the U.S. Geological Survey (USGS)-Florida Integrated Science Center (FISC) provides subsurface information needed to resolve geologic, hydrologic, and environmental issues in Florida. The program includes the acquisition, processing, display, interpretation, and archiving of borehole geophysical logs. The borehole geophysical logging program is a critical component of many FISC investigations, including hydrogeologic framework studies, aquifer flow-zone characterization, and freshwater-saltwater interface delineation.


Suggested Citation:

Wacker, M.A., and Cunningham, K.J., 2008, Borehole Geophysical Logging Program: Incorporating New and Existing Techniques in Hydrologic Studies: U.S. Geological Survey Fact Sheet 2008-3098, 4 p.

For more information, contact:

U.S. Geological Survey
Florida Integrated Science Center
3110 SW 9th Avenue
Ft. Lauderdale, FL 33315
954-377-5900

Michael Wacker at mwacker@usgs.gov or
Kevin Cunningham at kcunning@usgs.gov


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