Basic Well Logging and Formation Evaluation

( 13 )
179 pages
The textbook is addressed to students of geosciences and petroleum engineering. Subject are the fundamental techniques of borehole geophysics and the interpretation of measured data.
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Om författaren

Jürgen Schön is a retired petrophysicist. Currently he is a consultant and a honorary professor at the Montanuniversität Leoben. Previously, he was a senior geophysicist and Scientific Leader of Geophysical Institute of Joanneum Research (Leoben, Austria), held the chair for Well Logging and Petrophys...


The textbook is addressed to students of applied geosciences and petroleum engineering.

Subject are the fundamental techniques of well logging/borehole geophysics and the interpretation of measured data (formation evaluation). Examples with an exercise part (sandstone reservoir, shaly sand interpretation, complex mineralogy of a carbonate reservoir) help to understand the different methods and algorithms.

The user will learn

  • reservoir properties (porosity, saturation, fluids, permeability, capillary pressure),
  • the physical background of well logging methods and the response with respect to reservoir characterization (physical principle, primary information from logs),
  • rules for optimal log combinations, basic equations and models, fundamental techniques of log interpretation.
  1. Introduction
    1. History, present and future of a science and technology
    2. Fundamental problems and the way we go
  2. Reservoir Rocks, Reservoir Properties
    1. Reservoir rock types
    2. Porosity
    3. Fluids in the pore space: Saturation and bulk volume fluid
    4. Permeability
    5. Core analysis
    6. Summary
  3. Well Logging – Overview
    1. Introduction
    2. Principle of log measurement
    3. Logging methods – Classification
    4. The tool (probe) and the environment of measurement
  4. Well Logging – The Methods
    1. Borehole geometry
    2. Electrical and electromagnetic logs
    3. Nuclear logs
    4. Acousticlog, Sonic log
    5. NMR measurements
    6. Imaging Techniques
  5. Log Interpretation – Introduction
    1. Overview
    2. Quick-Look methods
    3. Quantitative Interpretation: Shale Content
    4. Quantitative Interpretation: Porosity from a single log
    5. Porosity and Mineral Composition – Multiple Porosity Methods
    6. Water Saturation from logs
  6. Some Applications in Water Exploration
    1. Water well in an unconsolidated formation
    2. Mineral water well in a fractured carbonate formation
  7. Examples and Exercises
    1. Oil-bearing Sandstone
    2. Shaly sand profile
    3. Mixed lithology Carbonate rock
  8. Appendix
    1. Physical properties of rock-forming minerals
    2. Some conversions
  9. Recommended books and sources
  10. References
  11. Index
  12. Endnotes