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Kentucky Geological Survey uses Python scripts to harvest and analyze digital well log data from existing LAS files. This can make the depths in the LAS file not evenly divisible by the increment between the depths. Sometimes the field engineer may not have “zeroed” the depth curve. An odd problem is also known related to digital data from Weatherford. In a few cases, the curves are the same data digitized at two different scales. Sometimes curve data, either digitized or imported into PETRA®, get identified by different mnemonics, but the data are identical. Problem 2) the duplication of other log curves occurred.
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Well log edition techlog software#
This will cause LAS Certify to fail and can result in misidentified data columns when the data are imported into another software package. Problem 1) a duplicate depth track was exported for many wells, which resulted in the number of columns of digital well log data in the ~ASCII data section did not match the number of curves listed in the ~CURVE section. The PETRA® export resulted in two primary problems. For Kentucky Geological Survey, problems were introduced into an online collection of LAS files when the files were exported from PETRA®. PETRA® is convenient for accumulating a collection of digital log data and using the data for stratigraphic analysis, cross sections, and mapping. The PETRA® software can be used to import and export digital log data formats and recognizes DLIS and LAS file types. The program included a built-in lithology analysis module that computed percent of limestone, sandstone, dolomite, and shale, reporting the LS, SS, DOL, and SH fraction traces. offers same capabilities, with advanced functionality for autotracing, detecting and managing wrapped curves, and utilities for editing digitized curves (spike and gap detection, smoothing, etc.) In the 1990s, Kentucky Geological Survey used TerraStation program that included a module for digitizing logs. PETRA® software offers a basic module for digitizing curve traces from images. Kentucky Geological Survey also obtains LAS files by digitizing scanned images. However, raw data files in original format are saved in a shared drive to address future needs, if they arise. 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.
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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.)