For Kentucky Geological Survey, problems were introduced into an online collection of LAS files when the files were exported from PETRA®. The PETRA® export resulted in two primary problems. 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. This will cause LAS Certify to fail and can result in misidentified data columns when the data are imported into another software package. Problem 2) the duplication of other log curves occurred. ![]() Sometimes curve data, either digitized or imported into PETRA®, get identified by different mnemonics, but the data are identical. ![]() In a few cases, the curves are the same data digitized at two different scales. An odd problem is also known related to digital data from Weatherford. Sometimes the field engineer may not have “zeroed” the depth curve. This can make the depths in the LAS file not evenly divisible by the increment between the depths. Kentucky Geological Survey uses Python scripts to harvest and analyze digital well log data from existing LAS files.
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