Well Log Viewer software can be used for viewing and plotting oilfield well-log data that is stored in either LAS, CSV, JSON or DLIS format files, and seismic waveform data that is stored in LDF or SEG-Y format files.

Some basic processing functionality for both Log data and VSP data is included. 

Well Log Viewer is a 64 bit application for computers running Windows-10. It also requires the Windows-10 version 1809 or later. Version 1809 is the Sept-2018 update (10.0.17763).

It can be downloaded from the location given below:



LAS files are ASCII files that are used to store and share oilfield well-log data. LAS files only support storing log channels that have a single data value at every depth point.

CSV or comma separated value files, are simplified ASCII files that contain only log data, and no other information. The format required for CSV files is specific to this application and discussed in a later section. Similar to LAS files, CSV files only support storing log channels that have a single data value at every depth point.

Log data can alos be stored in JSON formatted files. Only JSON files that are written according to the specifications desribed at https://jsonwelllogformat.org/ be read. JSON files are also an ASCII type file, and additionally support storing single axis array data. Multi-axis array may be supported in future releases.

DLIS files are binary files. See http://w3.energistics.org/rp66/v1/Toc/main.html for a full description. DLIS files support a large range of possibilities for data types, that includes mulit-axis array data.

LDF and SEG-Y files are used to store seismic waveform data (VSP waveform data).

Some of the Processing functionality that is currently available includes:

  • Unit conversions of log curves
  • Some basic arithmethic functions on log curves.
  • Resampling log curves to differnet samples rates.
  • Computions of velocity logs, acoustic impedance, elstic modulii and other geophysical logs.
  • Spatial filtering of logs.
  • TVD computation from deviation survey, and log TVD conversion.
  • VSP waveform filtering.
  • Q-estimation of VSP data
  • Curve cross-plotting and curve fitting.

A basic use of Well Log Viewer app is simply to convert DLIS data to either LAS, CSV or JSON formats. After the DLIS has been loaded, some basic editing or housekeeping on the data can be performed before it is saved to one of the 3 ASCII formats.


Version History

Version 2.0.12      26-May-2018.  First release

Version 2.1.20      18-Sept-2019.  Second release

Version 2.2.8        19-Jan-2020.  Third release

Privacy Policy

Link to Windows Store Privacy Policy for Well Log Viewer, that is required for Windows Store Apps.