Near Surface Geophysical Logging Data Set in Hard Sediments

<p>This is a unique data set that contains a series of slim hole geophysical logs collected from 10 closely spaced boreholes at a site intended for geophysical characterizations. </p>

<p>The logs include</p>

<p>1. Natural Gamma Ray</p>

<p>2. Three Arm Caliper</p>

<p>3. Magnetic Susceptibility (quality suspect)</p>

<p>4. Galvanic electrical logs including single point resisitance, spontaneous potential, and 8", 16", 32" and 64" normal resistivity logs.</p>

<p>5. Ultrasonic imaging log and associated orientation information.</p>

<p>6. Borehole fluid conductivity and temperature</p>

<p>7. Four receiver full wave form sonic logs with receivers at 0.6, 0.8, 1.0 and 1.2 m offset.   Derived velocity analysis semblance plots and interpreted P and S-wave slownesses are included.   NOTE - the S-wave slownesses are highly suspect because they are less than the speed of sound in the borehole water.</p>

<p>The boreholes were drilled to 20 m depth with a water well 6" bit, cement surface casing was used.  Two of the borehole are PVC cased with 4" ID.  The other 8 are open hole below the casing.  Problems were encountered with the depth of the water table being about 10 m below the surface making use of many of the logs difficult.  Rapid pumping of water into the boreholes did not solve this problem as a highly permeable fracture or sandstone took in water more rapidly than it could be pumped.</p>

<p>A separate zipped folder is created for each well.  This folder contains 'Organize_Muscrat_logs.m' that reads from the LAS log files in the unzipped borehole folders as well as some additional site geometry files to produce a final Matlab structure that contains all of the 1-D log data</p>

<ol>
<li>The raw data collected in the proprietary Mount Sopris/ALT *.tfd format.  These are separate files for each run named with a time code at the beginning but including the tool configuration in the name.</li>
<li>Organized WellCAD files that include the 1-D log and ultrasonic image data (BHXX.wcl) and the full waveform sonic data (BHXX-FWS.wcl). </li>
<li>Output ASCII LAS format files for the 1-D logs.</li>
<li>Output DLIS files from the two *.wcl files to allow access outside of the WellCAD program.</li>
</ol>

<p>There are other zipped files that are:</p>

<ol>
<li>Matlab-organization:  A Matlab program called Organize_MUSCRAT_logs.m that reads in the LAS format 1-D data, stores this into a MATLAB structure MUSCRAT.mat and plots a plan view map,  a series of fence diagrams saved as figures into the file folder 'Fence Diagrams' for each log type including the geotechnical geologic information, and the legend to the geological log. Note that the file calling addresses may need to be adjusted properly for this program to work correctly.</li>
<li>Background Information.zip contains files related to the geometry of the site, the geotechnical coring report, the logging boreholes drillers report, photographs taken from the field work, and scans of the hand written notes obtained during the logging.  Further information about cores taken from some of the geotechnical core holes is contained in a folder called 'Core Information' that includes XRD mineralogy and thin section images from the nearby geotechnical core holes.</li>
</ol>

<p>The final report of the work <strong>MUSCRAT Logging Report_Dec9_2025.pdf </strong>that also includes some measurements of porosity of a number of the samples from the cores that were available is also available. </p>

<p>These data are supplemental to the MSc thesis:</p>

<p>Karahalios, Nicholas John (2025). Characterization of West Virginia Bedrock Using Geophysical Logging Techniques. Purdue University Graduate School. Thesis. https://doi.org/10.25394/PGS.29693324.v1.</p>