Q5kqruchtpmwa1yjopbg ross%20resistivity

2 - Logging Tools - Resistivity

Tool Theory 1 - Est. Length: 2 hr

   Watch Promo

This course continues coverage of basic petrophysical analysis with a review of logs used to determine resistivity or correlation of rock formations.

You will learn the basic physics and operating principle behind each tool, the common log displays, and limitations of each tool.

Tools are described in their generic form and specific service companies may offer variations on the basic design concepts.

Knowledge of tool theory is especially important when things don't appear to be "going right". Many log analyses fail because the tool's limitations or operating environment were exceeded. You need to know when and where the data will be valid.

Who Should take this course:
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 basic physics and basic operating concepts
  • Shows common displays of logs and how to identify each curve.
  • Shows how to read logs (e.g. bed boundaries, which log curve is best to use).
  • Gives limitations, common pitfalls (borehole condition, mud system, invasion, mud cake effects).

Lecture Contents:

  • Electrical Survey
  • Spontaneous Potential
  • Induction Logs
  • Laterologs
  • Micrologs and Microlaterologs
  • Gamma Ray Logs
  • Caliper Logs
  • Thermal Decay Time Logs


Basic understanding of quantitative Petrophysics or equivalent background.
Basic understanding of high school level physics is helpful but not required.

Estimated Length:

1 hr video lectures

1hr reading + quiz

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

  Reading Material - Course Companion
Available in days
days after you enroll
  Electrical Survey (ES)
Available in days
days after you enroll
  Induction Logs (IES, DIL, AIT)
Available in days
days after you enroll
  Cased Hole Resistivity
Available in days
days after you enroll
  Spontaneous Potential
Available in days
days after you enroll
Available in days
days after you enroll
  Course feedback
Available in days
days after you enroll
  Completion Certificate
Available in days
days after you enroll

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 a 12-month access window sound? After purchase, you have unlimited access to this course for 12 months - 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.

"I studied your work as a student whilst at College- You are a Petrophysics legend." A.L., UK

"I'm an ardent fan of yours. By profession I'm Petrophysicist. (...) To me u r the Richard Feynman in Petrophysics." Shishir

"I so appreciate your Petrophysical course material because of how much I am learning from you about logs. So much better than my other courses because every page is about real world application." J.P., Oklahoma

"Thank you for your considered effort over the long term to educating the wider global O&G industry. Your are a credit to our industry - Thank you." J.R., Perth

"I wanted to thank you for putting together such a great petrophysical reference for everyone on the internet to use. Your material solidified my knowledge on many petrophysical concepts, including shaly sand phie and sw. My team also utilized your material to become better petroleum geologists." R.H., Montana

"I really would like to thank you for your generosity. It is really outstanding, and one of the most integrated resources for Petrophysics that I have ever come across. I decided to specialize in rock physics, and many thanks to you and your effort." M.M., Egypt

"I mail you to thank you a lot for your highly appreciated PE/PP material. Really I can't find the right words to describe how much valuable it is." D.A., Syria

"I'd like to express sincerest and deepest gratitude for your material on petrophysics, which actually covers a lot more very useful topics related to petroleum exploration and production. I've been referring to your material for a couple of months now and it proved to be very informative and helpful." A.S., Russia

"I really enjoy and appreciate your contribution to the development and enlightenment of earth scientists." O.S., Nigeria

"I appreciate the work and experience that you have shared with the industry through your material; the content has been a valuable resource to our evaluation program and speaks highly of your intellect." W.M., Dallas

"Your material has proven invaluable to me in a number of projects in the Permian Basin and Arkoma Basin. Everything is so well organized and thorough that I am able to resolve petrophysical questions much more quickly than digging through my old books and files! Thanks again for your leadership in this area." C.K., Texas

“My thanks to you. Your material is a wealth of great information and tools. It's clearly a "labor of love" for you and a treasure for any of us lucky enough to find it.”
E.C., Houston

Get started now!