Kentucky Geological Survey endeavors to distribute files in LAS format. Some service companies (including Norris Well Logging) use the Warrior software system for acquiring digital well log data, and outputting a LAS file. Weatherford’s PreView software is an integrated package that can read a DPK file and export either a TIFF image or a LAS file. The PDS files can be distributed separately and are used by Schlumberger utilities BlueView or PDSView to produce printable well log files. The DLIS format is the basic data and the Schlumberger software can be used to export either a LAS file or a PDS formatted file.
Schlumberger provides several separate digital data formats. Both file formats include software developed by (for) the company that enable exporting LAS-formatted files. Proprietary formats include Schlumberger’s *.DLIS (digital log information system) file and Weatherford’s *.DPK (“data pack”) files. The digital data files are commonly formatted in 2 ways: company proprietary formats and LAS. Operators are encouraged, but not required, to submit their logs in digital formats. Kentucky Geological Survey (KGS) receives some geophysical well data as digital data files submitted by operators. The following content describes Kentucky’s QA-QC process, kindly shared by Brandon Nuttall and Liz Adams. Kentucky Geological Survey uses PETRA® and LAS Certify software, and Python scripts for the conversion. Some state geological surveys convert TIFF to LAS files for selected wells of interest to project investigations. LAS file size is smaller than TIFF, and provides ability to perform calculations, such as determining porosity and lithology, and use in other applications. Some geological surveys send log scans to private vendors convert the TIFF to LAS files, because the task is too labor intensive to be cost effective. Converting well logs from TIFF to Log ASCII Standard (LAS) formatted files is resource intensive, requiring knowledge about software and geological characteristics. Geophysical well logs in paper format are scanned, saved, and distributed in tagged image file format (TIFF).
The borehole geophysical logging truck during field work (Public domain.)
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