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31 - Evaluation of Oil Shale

Log Analysis Methods for Evaluating Oil Shales with immature Kerogen | Estimated Length : 10 mins

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This course covers the numerical log analysis methods for evaluating oil shales with immature kerogen, such as those in the Green River Basin in Utah and Colorado, Immature oil shales must be distinguished from tight oil plays with mature kerogen, sometimes called shale oil or oil shale plays (Lecture 34). You will learn the specialized knowledge required to calculate oil yield in US gallons per ton of rock and how to calibrate this result to Fischer method core assay data. Examples specific to this environment are provided.


Petrophysicists, log analysts, geologists, reservoir engineers, and university / tech school students who wish to broaden their exposure to unconventional uses of well logs.


  • Provides specific quantitative analysis sequence for oil shales with immature kerogen
  • Provides "computer ready" mathematics
  • Answer oriented results, with quality control guided by core assays


  • Oil Shale Basics
  • Classifying Oil Shales
  • Oil Yield from Fischer Assay
  • Oil Yield From Log Analysis
  • Multiple Regression Models
  • Multi Mineral Models
  • Oil Shale Analysis Examples



Crain's Integrated Petrophysics, Lectures 1 to 11 OR equivalent background

Basic understanding of geology and logging tool response

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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