Geological Records Unit Collections
The Geological Records Unit houses over 500,000 drilling records.
Oil, gas, and Class II injection well records
Water well records
Coal test permits, plugging affidavits and records
Out of state records used in ISGS projects
Highway and bridge borings
Structure and stratigraphic tests
Historical well records of many types, including skeleton logs
Pipeline production books
Historical and current collections of scout tickets
Historical and current plat books
Oil and gas development maps
Office of Mines and Minerals well files
The Geological Records Unit maintains paper copies of individual well
files. All documents for each drill hole are filed together in a folder
and organized by location, including items such as
drilling time log
drill stem test report
core analysis report
commercial scout tickets
index numbers for samples and cores housed in the Samples Library
well drilling report
well completion report
summary sheet - generated when all the documents for the well have been received
Most water wells have relatively few documents and rarely have individual folders. Water well construction and permit information is included in the water well summary sheets in our log books. The water well source documents (the applications, permits, and construction reports generated through September 1997) are maintained by GRU. The Illinois State Water Survey maintains the later source documents.
Well Log Books
The well log books contain summary sheets for all types of drill holes.
The books are the sole source of many records and also serve as an index
to ISGS file folders. Currently the collection contains 1,356 log books
with approximately 680,000 pages on over 500,000 drill holes. These are
arranged by county, then by township, range, and section. The books
oil well summary sheet
report of gas flow measurement
water well summary sheet
index to cores in the Samples Library
bridge boring report
engineering report index
skeleton logs - pre-1920 oil well records, mainly in Crawford, Lawence, Clark and Cumberland Counties.
The well records database includes most of the basic identification information from our log books and files. It also includes much of the geologic formation and well construction/completion information. The database provides very versatile search capabilities. We are working toward making the database our most complete access tool. However, to be assured of a comprehensive search of our collections now, use all three access points: folders, well log books, and database.
Updated 02/17/2011 SLD