This Reference Manual and Short Course cover topics needed for location of natural fractures from conventional open hole and image logs, as well as calculation of fracture intensity, fracture porosity, fracture related porosity, matrix porosity, water saturation, and permeability. The use of dipmeter analysis and image logs as well as integration and calibration to core data is stressed.

QUICK FACTS: RF-09: 86 pages, 6 chapters, detailed table of contents, computer-ready math.

                           RF-09S: as above PLUS 70 narrated PowerPoint slides.

LEARN how to apply "Crain's Rules" to locate and quantify natural fractures.
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-01 Crain's Petrophysical PocketPal     RF-08 Crain's Analyzing Dipmeter and Image Logs

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


License:   Single-User • Corporate Academic




Introduction to Fractured Reservoirs
1.00 Fractured Reservoir Basics

1.01 Definition of Fractures

1.02 Using Logs to Locate Fractures

1.03 Using Core Analysis to Locate Fractures

1.04 Other Methods for Fracture Location

1.05 Recommended Logging Program


Locating Fractures With Conventional Logs

2.00 Fracture Identification Basics

2.01 Fracture Identification From Resistivity Logs

2.02 Fracture Identification From SP Logs

2.03 Fracture Identification From Caliper Logs

2.04 Fracture Identification From Micro Resistivity Logs

2.05 Fracture Identification From Dipmeter Logs

2.06 Fracture Identification From Density, Neutron, PE Logs

2.07 Fracture Identification From Gamma Ray Logs

2.08 Fracture Identification From Temperature Logs

2.09 Fracture Identification From Sonic Logs

2.10 Fracture Identification From Sonic Waveform Logs


Locating Fractures With Image Logs

3.00 Fracture Identification From Resistivity Image Logs

3.01 Fracture Identification From Acoustic Image Logs


Case Histories

4.00 Classic Example

4.01 Austin Chalk Example

4.02 Fractured Shales

4.03 Vertical Fracture in Vertical Hole

4.04 Vertical Fracture in Horizontal Hole


Quantifying Fractuews

5.00 Log Overlays and Crossplots to Quantify Fractures

5.01 Calculating Permeability From Stoneley Attenuation

5.02 Calculating Formation Strength

5.03 Calculating Fracture Intensity (Crain’s Method)

5.04 Calculating Fracture Intensity and Initial Flow Rate (Schafer’s Method)

5.05 Calculating Fracture Porosity and Fracture Permeability from Fracture Aperture


Dual Porosity Model

6.00 Basic Resistivity Concepts in Fractured Reservoirs

6.01 The Double Porosity Model in Fractured Reservoirs

6.02 Water Saturation in the Double Porosity Model



  • Fractured Reservoirs Basics

  • Definition of Fractures

  • Locating Fractures With Conventional Logs

  • Locating Fractures With Image Logs

  • Case Histories

  • Quantifying Fractures

  • Calculating Fracture Intensity

  • The Double Porosity Model in Fractured Reservoirs

  • Exercise 12


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