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16 - Ancient Logs

The Analysis of Older Logs Run | Estimated Time : 1 hr 30 mins

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This quantitative course covers the analysis of older logs run prior to about 1962, commonly called "ancient logs". You will learn skills needed to identify unfamiliar log curves, choose curves that are useful for quantitative analysis, re-scale curves where needed, and obtain reasonable results in the face of missing data. Some specialized methods applicable to ancient logs are provided. Examples and case histories illustrate the topic.


Petrophysicists, log analysts, geophysicists, geologists, reservoir engineers, and university / tech school students who wish to understand the wealth of useful information buried in ancient logs, especially those hidden away unused in existing well files.


  • Provides understanding of ancient logs (1932 - 1962)
  • Shows how to use these logs to explore in older or poorly developed areas
  • Gives calculations needed to analyze ancient logs


  • Introduction To Ancient Logs
  • Electrical Survey (FS Log)
  • Normal Curve
  • Lateral Curve
  • Spontaneous Potential (SP)
  • Laterolog (LL3, LL7)
  • Microlog (MLC)
  • Microlaterolog (MLLC)
  • Gamma Ray Log (GR)
  • Neutron Log (GNT)
  • Density Log
  • Sonic Log
  • Shale Volume, Porosity, Water Saturation
  • Case Histories
  • Exercise 16

ESTIMATED TIME : 1 hr 30 mins


Crain's Integrated Petrophysics, Lectures 1 to 13 OR equivalent background.

Basic understanding of geology and well logging.

Your Instructor

Ross Crain
Ross Crain

Mr Crain is a Professional Engineer with over 35 years of experience in reservoir description, petrophysical analysis, and management. He has been a specialist in the integration of well log analysis and petrophysics with geophysical, geological, engineering, and simulation phases of oil and gas exploration and exploitation, with widespread Canadian and Overseas experience. He has an Engineering degree from McGill University in Montreal and is a registered engineer in Alberta.

He wrote “The Log Analysis Handbook”, and he offers seminars, mentoring, or petrophysical consulting to oil companies, government agencies, and to consulting service companies around the world. Projects have spanned conventional and unconventional reservoirs in more than 40 countries.

Ross is credited with the invention of the first desktop log analysis system (LOG/MATE) in 1976, 5 years before IBM invented the PC. He continues to advise and train people on software design, implementation, and training. For his consulting practice, he uses his own proprietary software (META/LOG), and is familiar with most commercial systems.

He has won Best Paper Awards from CWLS and CSEG and has authored more than 30 technical papers. Mr Crain was installed as an Honorary Member of the Canadian Well Logging Society for his contributions to the science of well log analysis.

Ross's current interest is development of practical solutions for petrophysical analysis of all forms of unconventional reservoirs, determination of accurate mechanical properties of rocks for stimulation design, mentoring of both novices and experienced petrophysicists.

Class Curriculum

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Frequently Asked Questions

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The course starts now and never ends! It is a completely self-paced online course - you decide when you start and when you finish.
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