OG90
Course Contents
Module 1: Log Data Quality and Interpretation Framework
Key Topics
- Role of well logs in formal formation and reservoir evaluation workflows
- Open-hole, cased-hole and advanced logging tool physics overview
- Borehole environment dynamics, mud effects and invasion profile influence
- Depth matching protocols, curve editing and environmental corrections
- Log quality control (QC) and the recognition of unreliable or corrupted data
- Core interpretation workflow: from raw logs to quantitative reservoir outputs
- Managing uncertainty, establishing assumptions and documentation discipline
Module 2: Lithology, Shale Volume and Mineral Evaluation
Key Topics
- Gamma ray, spontaneous potential and alternative shale indicators
- Clean reservoir, shaly sand and carbonate log responses
- Triple-combo response: density, neutron and sonic behavior across lithologies
- Mineral identification using cross-plots (M-N plots, MID plots) and log overlays
- Clay type identification, shale distribution models and laminated intervals
- Thin-bed effects and addressing vertical resolution limitations
- Lithofacies interpretation using logs and local geological control
Module 3: Porosity, Saturation and Fluid Interpretation
Key Topics
- Core concepts of total, effective and secondary (vuggy/fracture) porosity
- Density-neutron-sonic porosity integration and matrix density selection methods
- NMR porosity principles: free fluid index and bound fluid interpretation
- Resistivity tools, invasion profiles and deep vs shallow fluid responses
- The Archie saturation model: parameter ($a, m, n$) selection and limitations
- Shaly sand saturation models (Waxman-Smits, Dual Water, Simandoux)
- Delineating fluid contacts, transition zones and direct hydrocarbon indicators
Module 4: Permeability, Rock Typing and Reservoir Quality
Key Topics
- Core-log calibration methodologies and depth matching practices
- Permeability estimation techniques from core data, empirical logs and NMR logs
- Flow units, hydraulic quality parameters and rock typing concepts
- Capillary pressure ($P_c$) applications and saturation-height functions
- Net reservoir, net pay definition and petrophysical cut-off selection methods
- Carbonate pore systems: managing vugs, natural fractures and heterogeneity
- Reservoir quality ranking and zonation for input into static models
Module 5: Advanced Integration and Petrophysical Reporting
Key Topics
- Borehole image log interpretation for natural fractures and bedding features
- Formation pressure data, pressure gradients and fluid contact confirmation
- Integrating well logs with seismic inversion, core analysis and production data
- Petrophysical properties upscaling for static and dynamic reservoir models
- Handling uncertainty in reserves calculations and volumetric parameters
- Common interpretation pitfalls, blind spots and quality assurance checks
- Integrated capstone case study and final petrophysical evaluation presentation