15 - Closure Stress

Analyzing Closure Stress from Well Logs | Estimated Length : 1 hr

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This quantitative course covers the estimation of pore pressure, overburden pressure, fracture pressure, and closure stress from data derived from well logs. You will learn the specialized skills needed to generate and quality control these values using leak-off tests and mini-fracs. Examples and case histories illustrate the topic.


Petrophysicists, log analysts, geophysicists, geologists, reservoir engineers, completion engineers, stimulation engineers, and university / tech school students who wish to understand the use of well log data in support of stimulation design.


  • Provides understanding of pressures and rock properties that influence stimulation design
  • Shows how to use these data to calculate closure stress
  • Provides step-by-step procedures for calculations
  • Gives insight into rock quality versus fracture performance
  • Gives "computer-ready" mathematics
  • Provides exercises and worked examples for further study


  • Calculating Normal Pore Pressure Gradient
  • Calculating Abnormal Pressure Gradient
  • Calculating Overburden Pressure Gradient
  • Calculating Fracture Pressure and Closure Stress Gradient
  • Calibrating Pressure Gradients
  • Calculating Fracture Extent
  • Gamma Ray Logging to Confirm Fracture Placement
  • Fracture Orientation from Caliper
  • Case Histories
  • Exercise 15



Crain's Integrated Petrophysics, Lectures 1 to 14 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.

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 lifetime access sound? After enrolling, you have unlimited access to this course for as long as you 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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