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4 - Log Response

Log Analysis Model | Estimated Time : 2 hrs

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This quantitative course continues coverage of basic petrophysical analysis with a discussion of the log analysis model. You will learn the log response equation, definitions of important terms, and an overview of Archie's equations which govern how we determine hydrocarbons from water. This is the foundation Lecture for all of quantitative petrophysical analysis. You may think you know all this, but l'll bet you will find at least one new concept here.


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 foundation for all future lectures in petrophysical analysis
  • Provides basic definitions of important terms
  • Gives underlying mathematical principles of petrophysical analysis


  • The Basic Petrophysical Analysis Model
  • The Log Response Equation
  • Definitions Needed to Understand Petrophysics
  • Quicklook Analysis Rules
  • Archie’s Laws
  • Exercises 0


Video: 1 hr

Reading and quiz: 1hr


Crain's Integrated Petrophysics, Lectures 1 to 3 OR equivalent background.

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

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