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5 - Visual Log Analysis

Fundamentals of Visual Log Analysis | Est. Length: 2 hrs

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This quantitative course continues coverage of basic petrophysical analysis by investigating what we can "see" by merely looking at well logs, using a few simple rules of analysis. You will learn the fundamentals of visual log analysis to obtain shale volume, porosity, and water saturation, which are the usual "quick-look" answers that everyone wants to know. Using Crain's Rules, a pencil, and a straight edge, you will complete your first log analysis in a very short time, and be able to repeat the process on many more examples over the years ahead. Illustrated step-by-step with a real world example.


Managers, geologists, log analysts, geophysicists, reservoir engineers, completion engineers, stimulation engineers, and university / tech school students who wish to become proficient in petrophysical analysis or who need to manage or make use of petrophysical results will benefit from this course.


  • Provides understanding of the visual, or eyeball, log analysis process
  • Provides step-by-step procedures for quick-look visual log analysis
  • Provides exercise and worked examples for further study


  • Visual Analysis Basics
  • Crain’s Rules for Visual Log Analysis
  • Visual Analysis for Exercise 1
  • Rules for Picking Log Data
  • Picking Logs for Exercise 1


1 hr video course

1hr reading and quiz


This is course 5 of Crain's Petrophysics Series. It can be taken independently or in sequence. If you don't have some background in Petrophysics it's advised that you take courses 1 through 4 before taking this course.

Basic understanding of geology is helpful but not required.

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

  Welcome to the course
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  Visual Analysis for Exercise 1
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  Rules for Picking Log Data
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  Picking Logs for Exercise #1
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  Download Reading Material
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  Course Feedback
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  Completion Certificate
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Frequently Asked Questions

When does the course start and finish?
The course starts now and never ends! It is a completely self-paced online course - you decide when you start and when you finish.
How long do I have access to the course?
How does 12-month unlimited access sound? After purchase, you have unlimited 12 months to access to this course as often as you'd like - across any and all devices you own.
What if I am unhappy with the course?
We would never want you to be unhappy! If you are unsatisfied with your purchase, contact us in the first 30 days and we will give you a full refund.

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