Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Electrical well logging

2,955 views

Published on

Electrical well logging

Published in: Education

Electrical well logging

  1. 1. Contents Introduction Borehole Environment Types of Well logging Types of Electrical Well logging Resistivity Method Self Potential method Induction Logging Conclusion References
  2. 2. Introduction • Well Logging involves measuring the physical properties of surrounding rocks with a sensor located in a borehole. The record of measuring as a function of depth is called as well logging.
  3. 3. Borehole Environment
  4. 4. Types of Well logging Well Logging 1) Electrical Well logging 2) Radioactivity Well logging 3) Sonic Well logging 4) Miscellaneous well logging
  5. 5. Types of Well logging Well Logging 1) Electrical Well logging  We used to measure lithological variations in borehole by measuring their electrical properties. It has been observed that in a borehole, the electrical potential varies according to the nature of the beds traversed.
  6. 6. Electrical Well logging Electrical Well Logging 1) Resistivity Method 2) Self Potential method 3) Induction Logging
  7. 7. Electrical Well logging Electrical Well Logging 1) Resistivity Method It works by characterizing the rock or sediment in a borehole by measuring its electrical resistivity. In the Sedimentary rocks most of the minerals are non-conductors (Silicates and Carbonates), but presence of water in the pore spaces can conduct electricity. In Metamorphic and Igneous rocks certain minerals can contribute their conductivity.
  8. 8. Resistivity Method Resistivity Method  Normal and lateral Log  Microlog  Laterolog  Microlaterolog  Proximity log
  9. 9. Resistivity Method Resistivity Method  Normal and lateral Log 2) Laterolog 3) Microlog 4) Microlaterolog 5) Proximity log The standard normal configuration The standard lateral configuration
  10. 10. Resistivity Method Resistivity Method  Normal and lateral Log  Microlog
  11. 11. Resistivity Method
  12. 12. Resistivity Method Resistivity Method  Normal and lateral Log  Microlog  Laterolog The Laterolog configuration
  13. 13. N M C0 Working Principal of Laterolog
  14. 14. N M C0 C2' C1' C2 C1
  15. 15. Resistivity Method Resistivity Method  Normal and lateral Log  Laterolog  Microlog  Microlaterolog
  16. 16. Resistivity Method Resistivity Method  Normal and lateral Log  Laterolog  Microlog  Microlaterolog  Proximity log
  17. 17. Electrical Well logging Electrical Well Logging  Resistivity Method The determination of resistivity for formations is essential to determination of saturation mainly of the hydrocarbon. True formation resistivity and flushed zone resistivity. Mud filtrate Invasion profile.
  18. 18. Electrical Well logging Electrical Well Logging  Resistivity Method  Self Potential Method
  19. 19. Cl¯ Na⁺
  20. 20. Cl¯ Na⁺
  21. 21. Electrical Well logging Electrical Well Logging  Resistivity Method  Self Potential Method To delineate porous and permeable reservoir rocks To determine bed boundaries and bed thickness To evaluate the formation water resistivity To estimate the fraction of clay. Correlation of permeable beds
  22. 22. Electrical Well logging Electrical Well Logging  Resistivity Method  Self Potential method  Induction Logging
  23. 23. Fe, Mg rich body
  24. 24. Conclusion  Well logging is the detailed survey, conducted after the location for drilling is fixed based on the other preliminary geological and geophysical surveys.  In the normal resistivity logging method, if the thickness of the bed is less than the separation between AM, then we will get reverse graph.  In the resistivity well logging method we use our own source but in the case of SP method we use natural current.  Proximity well logging is use to determine the density of the reserves.
  25. 25. Books:-  Philip Kearey, Michael Brooks, Ian Hill (2002), An Introduction to Geophysical Exploration, Third Edition, Blackwell Science Ltd, Pp 236-244  W.M. Telford, L.P. Geldart, R.E. Shrriff (1990), Applied Geophysics, Second Edition, Cambridge University Press, Pp 645-658  Darwin V. Ellis & Julian M. Singer (2007), Well Logging for Earth Scientists, Second Edition, Springer. Pp 41-59 Websites:-  http://www.greatgeophysics.com/logginginfo.html  http://en.wikipedia.org/wiki/Well_logging  http://petrofed.winwinhosting.net/upload/IAI/17- 20mar10/WellLoggingTech.pdf  http://petrowiki.org/Electrode_resistivity_devices

×