Nancy Hasenmueller
Geological Research at the IGS

Archiving Geophysical Logs

Status Start Date End Date Locations
completed Jul 1, 2015 Jun 30, 2017 All Counties
Director: Nancy Hasenmueller
Other Researchers:
Funding: Indiana University - Indiana Geological & Water Survey
Issue: Subsurface data provide a fundamental background for the exploration of glacial deposits for purposes such as broad terrain mapping, ground-water sensitivity analysis, or specific environmental applications. A cost-effective means of collecting subsurface sediment and sequence data for use in glacial terrain characterization and mapping is needed in order to illustrate lithologic variation, which will have an impact on creating effective maps for various uses.
Objective: The objective of the archiving projectis to create standardized digital formats of all IGS geophysical logs and make them available to IGS staff and the public as PDF and LAS downloads via the IGS web site
Approach: The Indiana Geological Survey collected data using a "holes-of-opportunity" approach consisting of following water-well drillers and using their drilled holes to collect information between 1978-2008. We continue to collect new gamma-ray log and sediment data on a yearly basis through IGS mapping projects and external agencies, keeping paper and digital records for each of the gamma-ray logs. We update and maintain a database with location and related information about the well, as well as processing the digital information. We have been archiving digital image files for each log since 2007. Logs collected prior to 1992, and those of inferior quality, are being scanned, digitized and converted to PDF and LAS. Approximately 90 gamma-ray logs remain to be digitized. There also exist 200–300 resistivity and gamma-ray logs from older IGS holes, and a number of geophysical logs from shallow bedrock holes drilled by American Exploration in southeastern Indiana that should be digitized and archived accordingly.
Products: The publication, Slow-Logging Subtle Sequences: The Gamma-Ray Log Character of Glacigenic and Other Unconsolidated Sedimentary Sequences, by N.K. Bleuer, Indiana Geological Survey Special Report 65, provides an explanation of gamma-ray log use in glacial-terrain characterization. Future products may include online access to scanned gamma logs and their digital data for use in plotting and graphing software.
Benefits: These data provide an extensive resource of subsurface data in the form of analog and digital gamma-ray logs. These logs provide fundamental background material for the exploration of geologica materials for purposes such as broad terrain mapping, ground-water sensitivity analysis, or specific environmental applications.
Publications:

Slow-Logging Subtle Sequences: The Gamma-Ray Log Character of Glacigenic and Other Unconsolidated Sedimentary Sequences
Bleuer, N. K., 2004, Slow-logging subtle sequences: The gamma-ray log character of glaciegenic and other unconsolidated sedimentary sequences. Indiana Geological Survey Special Report 65,39 p., 27 fig.

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