OG90
Course Contents
Module 1: Formation Evaluation Principles and Data Integration
Key Topics
- Role of formation evaluation in exploration and development
- Integrated workflow from data acquisition to interpretation
- Key data sources: logs, core, mud logs, and pressure data
- Reservoir properties: lithology, porosity, and permeability
- Clastic and carbonate reservoir evaluation challenges
- Data quality control and uncertainty recognition
- Deliverables from an integrated evaluation study
Module 2: Well Logs, Lithology and Porosity Evaluation
Key Topics
- Gamma ray, spontaneous potential, and shale volume concepts
- Resistivity logs and fluid response in reservoir rocks
- Density, neutron, and sonic logs for porosity estimation
- Lithology identification in clastic and carbonate intervals
- Porosity types: intergranular, vuggy, moldic, and fracture
- Environmental corrections and log quality checks
- Cross-plots for lithology and porosity interpretation
Module 3: Core, Rock Typing and Reservoir Quality Assessment
Key Topics
- Routine and special core analysis applications
- Core-log calibration and depth matching practices
- Grain size, texture, cementation, and diagenesis controls
- Carbonate fabrics, pore systems, and heterogeneity
- Rock typing, flow units, and hydraulic quality indicators
- Permeability prediction from core and log data
- Integrating geology and petrophysics for reservoir quality
Module 4: Saturation, Fluids and Net Pay Determination
Key Topics
- Water saturation models and Archie equation fundamentals
- Shaly sand evaluation and non-Archie interpretation issues
- Capillary pressure, transition zones, and fluid contacts
- Formation pressure data and fluid gradient analysis
- Hydrocarbon indicators from logs and pressure data
- Net reservoir, net pay, and cut-off selection methods
- Uncertainty in saturation, pay, and fluid interpretation
Module 5: Integrated Reservoir Characterisation and Reporting
Key Topics
- Combining logs, core, pressure, and dynamic production data
- Reservoir zonation and correlation for evaluation studies
- Formation evaluation input to static reservoir models
- Applications in well placement and completion planning
- Common interpretation pitfalls in complex reservoirs
- Evaluation reporting, assumptions, and technical risks
- Final integrated case review and action planning