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22 - Log Editing

Quantitative Methods for Editing and Modeling Sonic and Density Logs | Estimated Time : 30 mins

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This course provides quantitative methods for editing and modeling sonic and density logs for use in seismic modeling and interpretation purposes. You will learn the specialized techniques used to overcome effects caused by bad hole conditions, gas and light hydrocarbons, missing log curves, and other annoying problems. Seismic models and synthetic seismograms are worthless if the input log data is not as close to the truth as possible. Numerous examples and case histories are included.


Petrophysicists, log analysts, geophysicists, geologists, reservoir engineers, and university / tech school students who need to generate log analysis results in aid of seismic modeling, synthetic seismograms, seismic inversion, or AVO models.


  • Provides methods for editing and modeling of sonic and density logs
  • Provides "computer ready" mathematics
  • Gives insight into how log analysis can support geophysical models


  • Log Editing Concepts
  • Modeling Sonic and Density with Response Equation
  • Seismic Check Shots
  • Editing Sonic Logs With SRS and VSP Data
  • Modeling Sonic and Density Logs With Trend Data
  • Modeling Sonic and Density Logs From Resistivity
  • Modeling Sonic and Density Logs From Neutron and Gamma Ray
  • Modeling Sonic and Density Logs With Regression
  • Modeling the Sonic Log Response From Biot-Gassmann Equations
  • Gardner’s Model for Density from Sonic
  • Exercise 22



Crain's Integrated Petrophysics, Lectures 1 to 13 and 21 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.

Class Curriculum

  Welcome to the course
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  Regression Analysis and Biot – Gassmann
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  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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