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E-321 - Fundamentals of Reservoir Geology

E-321 - Fundamentals of Reservoir Geology

15 days
This course is not scheduled.
Who should attend?


    • Newly-hired or 2-3 years experienced reservoir engineers willing to deepen their knowledge in reservoir geology: geoscientists, production, drilling and completion engineers moving towards reservoir engineering.


  • Proficiency
  • This course provides a thorough understanding of reservoir geology, covering concepts as well as data reviewing and modeling.
Learning Objectives
  • Upon completion of the course, participants will be able to:
  • describe and explain main concepts of Reservoir Geology, especially petrophysical concepts, used in the description of the reservoir and the way the data are measured,
  • deduce major reservoir properties from log interpretation and compare to core measurements,
  • define rock-types, determine electro-facies and derive K-Phi relationship,
  • integrate cores, logs and well tests data for reservoir modeling,
  • apply the workflow for building a reservoir model using dedicated software,
  • identify and assess the uncertainties in order to reduce the risk and optimize the investments.
Course Content


5 days

  • Introduction to reservoir characterization: reservoir characterization and modeling objectives; reservoir characterization and modeling workflows; data and related uncertainty, data integration.
  • Reservoir architecture: seismic interpretation pitfalls, well log analysis.
  • Facies analysis. Rock-typing.
  • Petrophysics and rock properties. Reservoir heterogeneities.


5 days

  • Reservoir properties from conventional and special core analysis:
  • Coring.
  • Porosity: definition and measurements (effective and total porosity); pore size distribution by NMR and mercury Injection.
  • Single-phase permeability: definition and measurements; liquid and gas permeability, Klinkenberg correction; permeability composition.
  • Capillary pressure: definition and measurements (porous plates and centrifuge/interpretation, local saturation); from lab to reservoir: Pc to determine reservoir initial saturations and transition zones.
  • Wettability: definition and measurements (Amott index, USBM index); influence of wettability on Pc.
  • Electric measurements. Formation factor and Resistivity Index (RI).
  • Multi-phase permeability: Darcy's law for two-phase flows core analysis; relative permeabilities: steady-state, unsteady-state, interpretations, synthesis.
  • Influence of wettability on the relative permeabilities.
  • Petrophysical rock-typing. Leverett J functions.
  • Reservoir properties from log evaluation: wireline logging operations and logs; open-hole log interpretation methodology; determination of reservoir properties from log interpretation (lithology, porosity, water saturation; Archie law).


5 days

  • Basic principles: introduction and objectives; case study: field presentation and data discussion; project definition; data QC and summary table; interpolation and basic reservoir modeling.
  • Structural framework: structural context; time depth conversion; surfaces modeling and quality control; fault modeling and regions; well correlation and stratigraphic data analysis; grid building; grid zones and layering; geo-cellular grid validation.
  • Rock type and facies modeling: basic geostatistical; rock typing; data analysis; facies modeling.
  • Property modeling: petrophysical modeling; seismic drivers in reservoir modeling; geological model analysis: N-t-G, porosity, permeability and water saturation.
  • Volumetric, upscaling and uncertainty: hydrocarbon volume calculation; structure and properties upscaling; quantification of uncertainty; sensitivity analysis and ranking of models; inputs for reservoir simulators; summary, synthesis and wrap-up.
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Ways & Means
  • Interactive lectures, exercises.
  • Hands-on practice using software dedicated to reservoir modeling (EasyTrace™ and PETREL™).