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Prospecting of electrical logging method

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Prospecting of electrical logging method

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Prospecting of electrical logging method

  1. 1. Introduction Well logging Types of Well Logging Electrical Logging Types of Electrical Logging Spontaneous Potential Logging Resistivity Logging Induction Logging Conclusion References
  2. 2. IntroductIon •Geophysical exploration-study of physical properties Geological materials by using appropriate instruments •Types of geophysical exploration: •Electrical •Magnetic •Gravity •Seismic •Radioactive and •Well logging
  3. 3. Well loggIng Continuous recording of a physical parameter of the formation with depth by introducing sonde First developed by Schlumberger brothers in 1927 To identify the productive zone of hydrocarbon and its mobility To define petrophysical parameters To determine depth, thickness, formation temperature and pressure of reservoir To distinguish between oil, gas and water zones in a reservoir
  4. 4. Types of well logging Electrical method  Radioactivity method Sonic logging Miscellaneous logging
  5. 5. electrIc loggIng Continuous record of the electrical properties of the fluids and geologic materials Performed by measuring current through electrodes in the logging device or sonde Used in geological investigations to assess the variation with depth of geologic materials and associated fluids Correlate and determine the continuity of geologic strata Types- Resistivity, Spontaneous(Self) Potential, Induction logging
  6. 6. Spontaneous Potential Logging Due to salinity between formation water and mud filtrate against permeable beds The measurement is made through a potential meter Useful in Establishing correlation of beds from well to well To determine bed boundaries and thickness To evaluate the formation water resistivity To delineate porous and permeable reservoir rock
  7. 7. Resistivity Logging oAbility to impede the flow of electric current oFall in the range from 0.2 to 100 ohm meter o4 electrodes are used oCarried out by lowering of electrodes oTypes Normal and Lateral logs Laterolog Microlog Microlaterolog Proximity
  8. 8. Normal and Lateral log 4 electrodes-2 potential(M and N), 2 power electrodes(A and B) Normal device- A and M are closely spaced , B is grounded and N is far away from A-M Lateral device- M and N closely spaced with electrode A
  9. 9. Microlog The resistivity of a small volume of formation 3 electrodes(A, M1 and M2) in vertical line Spacing is 1 inch( 2.5cm) Excellent permeability indicator
  10. 10. Microlaterolog Central electrode very small size and 3 circular electreodes concentric with 1-2 cm Accurate estimate of flushed zone resistivity and hence porosity
  11. 11. Proximity log Used with other resistivity logs Evaluate permeable zones exhibiting thick (up to 2 cm) mud cakes
  12. 12. Induction Logging In dry boreholes or boreholes containing nonconducting fluids Based electromagnetic induction Parameter is conductivity Transmitter coil and receiver coil coaxially supported by an insulating mandrel
  13. 13. Laterolog 4 electrodes- one at centre and 3 are symmetrically placed with centre one
  14. 14. Case study 1:
  15. 15. Case study 2:
  16. 16. Case study 3:
  17. 17. Well logging technique is one of the type used in geophysical exploration This can be performed by logging devices or SONDE Electrical logging can be done by measuring current through electrodes in the logging device Spontaneous potential, resistivity and induction logging To identify productive zone of hydrocarbon, to define petrophysical parameter, to determine depth, formation temperature and pressure of a reservoir, to measure hydrocarbon mobility Conclusion
  18. 18. References M.G. Ramachandra Rao, Outlines of Geophysical prospecting (1975) Prasaranga Manasagangotri Mysore pp:343-366 1981,Milton B Dobrin, Introduction to geophysical prospecting , Third edition, Mcgraw- HILL Book Company pp:568-622 www.wikipedia.com www.greatgeophysics.com/logginginfo.html www.geologging.com/english/products/.../ele tric_log.htm

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