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.
- 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.