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E-156 - Well Logging & Basic Log Interpretation

32 hours GEO/BLWLI
  • Geologists, geophysicists, reservoir engineers interested in well log interpretation.
  • This course provides a practical understanding of basic concepts and methodology of well log acquisition and interpretation for subsurface and reservoir studies.
Learning Objectives
  • Upon completion of the course, participants will be able to:
  • understand wireline and mud log acquisition techniques,
  • grasp fundamental physics of log measurements and to perform log quality control,
  • perform basic log interpretation in order to identify and characterize reservoirs.
  • No prerequisites for this course.
Ways and means
  • The first 2 hours are dedicated to introducing agenda, methods and tools.
  • Specific needs and expectations of each participant are also assessed and discussed (MCQ and phone interview with the tutor).
Total training duration is 32 hours, spread over an 8-week period

Basic interpretation concepts 8 hours
  • Seals and reservoirs.
  • Definition of main reservoir petrophysical and fluid properties (lithology, porosity, resistivity, saturation).
  • Fundamental equations for log interpretation in clean formations.
  • Measurement environment (drilling, borehole, invasion process).
Measurements & applications 12 hours
  • Mud logging and coring operations.
  • Wireline logging operations.
  • Well log: header, calibrations, parameters, repeat section, main log.
  • Logging tool principle, limitation, application, quality control.
  • Caliper, gamma ray and GR spectrometry, spontaneous potential.
  • Resistivity (induction, Laterolog) and microresistivity measurements.
  • Porosity and lithology measurements: nuclear (litho-density, neutron) and acoustic logging.
Basic log interpretation 12 hours
  • Wireline log interpretation in clean formations:
  • Identification of shales, common geological formations and reservoirs.
  • Cross-plot technique with density and neutron.
  • Identification of fluid contacts.
  • Hydrocarbon effects on logs.
  • Determination of lithology and porosity.
  • Determination of Rw (SP, Ratio, Rwa).
  • Determination of water and hydrocarbon saturations.
  • Case of oil-based mud.
  • Estimation of h.Phi.So.