BSLS Online
- Online tool for generating and constructing biostratigraphic and lithostratigraphic column charts.
- http://www.bslsonline.com/

MRI Petrophysical Applications Center
- Application of non-imaging and imaging nuclear magnetic resonance to formation evaluation and reservoir engineering. Associated with Texas Tech University.
- http://www.depts.ttu.edu/peWeb/research/mripac/

Daniel E. Shier
- Specializing in pre-1965 well logs. Reliable porosities from old neutron curves from West Texas, FSU.
- http://www.rockypine.com

Opus Petroleum Engineering Ltd.
- Provides formation water interpretation and training for the petroleum industry and publisher of the "Opus Handbook - Formation Waters of Western Canada."
- http://www.opuspetroleum.com/

Oil and Gas Evaluations and Consulting
- Log digitizing/editing, petrophysics, wellsite quality control, pore pressure analysis, completion/production analysis.
- http://www.ogec.com

Petrophysical Consulting Inc.
- Mapping subsurface reservoir properties using seismic, well log, and core data. Based in California.
- http://www.rockphysics.com/

Petrophysics Pty Ltd.
- Formation evaluation consultancy providing wireline log analysis, integrated petrophysics studies, training courses.
- http://www.petrophysics.net/

Contract Log Analysis Ltd
- Wireline logging program design, supervision and quality control. Analysis of log data and reporting of results.
- http://www.contractlog.com

Donald G. Hill
- Petrophysics, formation evaluation, well log analysis, borehole geophysics, subsurface geology, geophysics
- http://www.hillpetro.com/

Henderson Petrophysics
- Wireline log analysis, field studies, wellsite geology, reserves calculation, database development. Source rock analysis from logs.
- http://www.hendersonpetrophysics.com/