Well Logging & Qualitative Log InterpretationMETH/LOGBASIC

Who should attend?

  • This course provides an overview of main logging tools and proposes an insight into fundamental well log interpretation for reservoir identification and characterization.
Audience :
  • Geoscientists and other E&P professionals interested in wireline log acquisition and well-log interpretation.

Level : Foundation

Course Content

  • BASIC INTERPRETATION CONCEPTS & WIRELINE LOG RECORDING

      • Foundational concepts. Reservoir petrophysics (lithology, porosity, resistivity, saturation) and fluid properties.
      • Environment of measurement (borehole, invasion profile) and related parameters.
      • Fundamental equations (Archie formula) for log interpretation in clean formations.
      • Mud logging, measurements during drilling, coring and wireline logging techniques. Applications.
      • Well logs examples.
  • REVIEW OF LOG MEASUREMENTS & APPLICATIONS

      • Wireline logging operations and wireline logs.
      • Logging-While-Drilling techniques and LWD logs.
      • Well logs: header, calibration, parameters, repeat section, main log.
      • Wireline logging tools: principle and applications, limitations, calibration, environmental corrections and quality control:
      • Caliper, Gamma Ray and GR spectrometry, Spontaneous Potential.
      • Resistivity (Induction, Laterolog) and micro-resistivity measurements.
      • Porosity & lithology measurements: nuclear (Litho-Density, Neutron) and acoustic logging (Sonic).
      • Application on case studies.
  • “QUICK-LOOK” INTERPRETATION

      • Qualitative well-log interpretation:
      • Log responses in most common geological formations.
      • Identification of reservoirs and fluid contacts (overlay technique: water- and oil-based mud cases).
      • Hydrocarbon effect on density & neutron logs.
      • Determination of water resistivity Rw (SP, Ratio, Rwa), formation resistivity (Rt, Rxo) and flushed zone diameter.
      • Determination of lithology, porosity, water and hydrocarbon types and saturations.
      • Cross-plot techniques with density, neutron, sonic and other logs (Pe, K, Th, etc.).
      • Shale effects on logs: introduction to shaly and complex lithology formations.
      • Application on case studies.
  • PRESSURE MEASUREMENTS & FLUID SAMPLING

      • Pressure measurements and fluid sampling: operation and applications.
      • Pressure analysis: determination of fluid contacts, fluid gradient and fluid density.
  • NMR, DIPMETER & BOREHOLE IMAGING TECHNIQUES

      • NMR log (Nuclear Magnetic Resonance): principle and applications.
      • Dipmeter and borehole imaging tools: principle and applications.

Learning Objectives

  • Upon completion of the course, participants will be able to:
  • acquire the concepts of log interpretation (Archie formula, invasion),
  • review mud logging, coring and wireline logging techniques,
  • perform a quick-look interpretation to characterize reservoirs: fluid contacts, lithology, porosity, saturation.

Ways & Means

  • Interactive presentations and exercises to build a lithology and fluid column.