This Reference Manual and Short Course cover visual and numerical log analysis methods for logs run before 1960. Topics include electrical survey (ES). spontaneous potential (SP), micrologs, laterologs, old style neutron, sonic and density logs, as well as ancient gamma ray logs. Solutions for shale volume, porosity, and water saturation are provided for most combinations of these tools. A special section is included on Russian-style logs for those who need to assess potential in FSU areas. These logs were still being run as recently as 2016, so if you work Eastern Europe or Central Asia, you will need this course.

QUICK FACTS: RF-03: 95 pages, 20 chapters, detailed table of contents, computer-ready math.

                           RF-03S: as above PLUS 100 narrated PowerPoint slides.

LEARN how to apply "Crain's Rules" to ancient log suites.
PRACTICE the step-by-step procedures on real-world exercises.
REVIEW the case histories to see how your results match reality at the well head.
UNDERSTAND the technical and economic benefits of competent petrophysical evaluation of your assets.

SUITABLE FOR: all geoscientists, geotechs, engineers, managers and CEO's.

RF-04 Crain's Logging Tool Theory 

Put my 50 years of practical petrophysical experience to work for you.


License:   Single-User • Corporate Academic



1 Ancient Logging Tools
      Electrical Survey
      Spontaneous Potential
       Induction Logs
       Micro Resistivity Logs
       Sonic Logs
        Density Logs
        Neutron Logs
        Gamma Ray Logs
        Modern Resistivity Inversion Software

2 Shale Volume
3 Pore Volume
4 Porosity From The Neutron Log
5 Porosity from ES and Micrologs
6 Maximum Porosity Method
7 Water Resistivity From Catalog or DST Recovery
8 Water Resistivity From Water Zone (R0 Method)
9 Water Resistivity From Spontaneous Potential
10 Water Saturation from Archie Method
11 Water Saturation from Simandoux Method
12 Water Saturation from Dual Water Method
13 Water Saturation From Buckles Number
14 Water Saturation and Porosity from Ratio Method
15 Irreducible Water Saturation
16 Permeability and Productivity
17 Permeability From Wyllie-Rose Method
18 Permeability From Porosity
19 Calibrating to Modern Logs and Core Data
20 Case Histories

ADDED Feature: Analyzing Russian Style Logs




  • Introduction To Ancient Logs

  • Electrical Survey (FS Log)

  • Normal Curve

  • Lateral Curve

  • Spontaneous Potential (SP)

  • Laterolog (LL3, LL7)

  • Microlog (MLC)
    Microlaterolog (MLLC)

  • Gamma Ray Log (GR)

  • Neutron Log (GNT)

  • Density Log

  • Sonic Log 

  • Shale Volume, Porosity, Water Saturation

  • Case Histories

  • Exercise 16


  • Introduction To Russian-Style Logs

  • Electrical Survey (BKZ)

  • Normal Curve (Potential, PZ)

  • Lateral Curve (Gradient, GZ)

  • Russian Core Analysis

  • Gamma Ray Log (GK)

  • Neutron Log (NGK)

  • Density Log (GGK)

  • Sonic Log (AK)

  • Shale Volume, Porosity, Water Saturation

  • Case Histories

  • Exercise 17



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