USGS Florida Water Science Center Borehole Geophysical Logging Program
Project Chief: Michael A. Wacker
Cooperator: Government agencies
Period of Project: Ongoing
The borehole-geophysical logging program of the U.S. Geological Survey Caribbean Florida Water Science Center (CFWSC) 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 investigations including hydrogeologic framework studies, aquifer flow-zone characterization, and freshwater-saltwater interface delineation.
Figure 1. Logging assistant preparing to log with the acoustic borehole logging tool in offshore Biscayne Bay, southeastern Florida.
Figure 2. Typical log montage produced by the CFWSC borehole geophysical group with 20 vertical tracks of log data displayed. From left to right for this example the tracks include: (1) depth, (2) formation name and lithology, (3) cyclostratigraphy, (4) core recovery, (5) lithofacies, (6) this section description, (7) digital optical borehole image, (8) porosity logs (with whole core data), (9) caliper, (10) acoustic borehole images, (11) borehole fluid temperature and fluid resistivity, (12) heat-pulse flowmeter, (13), spinner flowmeter logged downhole, (14) spinner flowmeter logged uphole, (15) flowzone, (16) natural gamma ray, (17) induction conductivity and resistivity, (18) spontaneous potential and single-point resistivity, (19) Stoneley-wave amplitude and whole-core permeability, and (20) compressional-, shear-, and Stonely-wave velocities.
Figure 3. Example of a new high resolution optical borehole image of a three-well monitoring cluster. The image data was collected at three different settings (Well C was the lowest resolution and Well A the highest) to determine the best resolution for image data collection in shallow south Florida wells.
Note: Click on image to download the file.