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Basic Well Log Interpretation

PTTC Rockies

Tuesday, February 18, 2014 at 8:30 AM - Thursday, February 20, 2014 at 5:00 PM (MST)

Basic Well Log Interpretation

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Standard Ended $650.00 $9.95

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Event Details

 Instructor: Dr. Dan Krygowski, Discovery Group, Denver, CO 

The fee includes refreshments, workbook, and PDH certificate

Synopsis: The course assumes no logging knowledge, and seeks to establish an understanding of basic petrophysical measurements and interpretation techniques which can be applied to routine tasks, and upon which more complex and advanced information and techniques can be built.

The course:

  • Offers a "hands-on" approach to basic openhole well log analysis and interpretation.
  • Focuses on the traditional interpretation targets of lithology, porosity, and fluid saturation.
  • Introduces a variety of interpretation techniques in the context of the availability of newer, more extensive, data
  • Is organized by the targets, or goals of the measurements, rather than by the physics of the measurements.

The course strives to provide a strong and coherent foundation for the understanding of other, specialized interpretation techniques involving well log data, which are not covered here.

Course topics include:

  • An overview of petrophysical well log data acquisition
  • Description of correlation/lithology, porosity, and resistivity logs
  • Determination of lithology, porosity, and fluid saturation from logs
  • Interpretive techniques using logs individually and in combination
  • Interpretation exercises to reinforce the interpretation methods discussed

Length: Three Days

Equipment Needed: Calculator with exponent functions, straight-edge, pencil or pen.

Topics for each of the log measurements follow the same sequence and information:

  • Measurement goals
  • Physics of the measurement, including the volume of investigation
  • Operational parameters; conditions under which the measurement is best made
  • Measurement names; tool and curve names from different vendors
  • Log example; usually in the context of other measurements
  • Interpretation details; details of the measurement goals
  • Secondary effects: the environments and assumptions which affect the measurement and its interpretation
  • Environmental corrections
  • Quality control
  • An exercise related to the primary interpretive goal


AgendaThe times shown are best estimates based on previous presentations of the course. The times will vary to some extent, depending on the questions and comments of the class. Questions and comments based on the experience of the class participants are welcome, and often provide insights to local conditions and methods which would not otherwise be presented.

While formal break times are noted in the schedule, shorter breaks are often taken, as dictated by class needs.

Day 1

8:00 to 9:45                Course Logistics, Introduction

9:45 to 10:00              Break

10:00 to 12:00            Correlation/Lithology logs: SP, gamma ray, caliper, tension

12:00 to 1:00              Lunch

1:00 to 2:30                Correlation/Lithology logs, continued

2:30 to 2:45                Break

2:45 to 4:30                Porosity logs; sonic, density, and neutron 

Day 2

8:00 to 9:45                Porosity logs, continued

9:45 to 10:00              Break

10:00 to 12:00            Porosity log combinations: lithology and better porosity

12:00 to 1:00              Lunch

1:00 to 2:15                Porosity log combinations, continued

2:15 to 2:30                Break

2:30 to 3:30                Nuclear magnetic resonance (NMR) logging

3:30 to 4:30                Resistivity introduction

Day 3

8:00 to 9:45                Deep resistivity logs; induction and laterologs

9:45 to 10:00              Break

10:00 to 10:45            Microresistivity logs; sensing close to the borehole, and why

10:45 to 12:00            Archie’s saturation equation and it’s parameters

12:00 to 1:00              Lunch

1:00 to 2:30                Saturation and parameters from pattern recognition techniques

2:30 to 2:45                Break

2:45 to 4:00                Water saturation and bulk volume water

4:00 to 4:30                Course summary 

Time for hands-on exercises, which the class can do individually or in small groups, is included in the above schedule.

Instructor: Daniel A. Krygowski

 Dan Krygowski joined The Discovery Group as a Senior Petrophysicist in late 2006. He has over 30 years of experience in the art and science of petrophysics, and in the development and design of petrophysical software. Dan earned a B.A. in Physics from the State University of New York at Geneseo. After earning M.S. and Ph.D. degrees in geophysics from the Colorado School of Mines (with a focus on petrophysics), he joined Cities Service Company, and worked in Denver and Tulsa. After Citco, he joined Atlantic Richfield Company (ARCO). In both companies he gained experience in a variety of geologic and geographic areas in both technical and management positions in petrophysics.  

After ARCO, he joined Landmark Graphics, and was a member of the PetroWorks development team as the team’s petrophysical Subject Matter Expert. He was also involved in interface design, and development of documentation and training materials. When Landmark closed its Austin, Texas office, Dan joined Chevron, working in deep Gulf of Mexico and Chad, Africa projects. He also supported internal petrophysical training efforts. 

Since the late Cretaceous, Dan has taught the AAPG Basic Well Log Analysis course annually with Dr. George Asquith of Texas Tech University. Dan also teaches Basic Openhole Log Interpretation, a similar, but shorter course, and Petrophysics Elements, a much longer, lower intensity course meant to delve deeper into petrophysical information and methods as part of participants’ regular job duties. Both are taught through direct client requests. In collaboration with Jason/CGG, Dan also teaches Basic Openhole Petrophysics for Geoscientists and Engineers which extends the petrophysical science that is taught through the introduction of Powerlog petrophysical software.

In 2004, AAPG published George and Dan’s book, Basic Well Log Analysis, a second edition of George’s 1983 similarly-named book which was one of the AAPG’s all-time best selling publications.

Dan is a member of the Society of Petrophysicists and Well Log Analysts (SPWLA), American Association of Petroleum Geologists (AAPG), Society of Petroleum Engineers (SPE), Society of Exploration Geophysicists (SEG), the Denver Well Logging Society (DWLS), and the Rocky Mountain Association of Geologists (RMAG). He is a Texas Registered Professional Geoscientist.

Dan can be contacted at:
   303.831.1515 x24

Have questions about Basic Well Log Interpretation? Contact PTTC Rockies

When & Where

Colorado School of Mines
1600 Maple Street
Golden, CO 80401

Tuesday, February 18, 2014 at 8:30 AM - Thursday, February 20, 2014 at 5:00 PM (MST)

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Basic Well Log Interpretation
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