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Geophysical Techniques and Methods for Hydrocarbons Exploration-Production and Energy Transition
Synthesis
Chapter 1: Introduction & General
-Key role of geophysics in the hydrocarbon exploration – production workflow
-Reminder of some definitions, 5 petroleum system elements (source rock, reservoir, seal, trap, charge)
Chapter 2: Geophysical Data Acquisition
- Seismic Technique and Method:
–General principles, geometry of wave propagation, different types of seismic waves
–Seismic data acquisition, 2D, 3D, 4D surveys. Sources, Receivers, Transmission (land, marine)
–Time Processing: CDP collection, NMO, different types of seismic velocities, limits of stack sections.
–Deep Imaging : objectives and general principles of migration, construction of the velocity model, different migration algorithms, comparison of processing sequences (Time and Depth)
- Other geophysical techniques
-Gravimetry, Remote Sensing, passive seismic
-Electro-Magnetism, Magneto-Telluric, CSEM
Chapter 3: The Seismic Interpretation Workflow
– First steps: Quality control of seismic data; Well to seismic calibration.
– Structural interpretation => Trap characterization (geometry, size)
Different tectonic domains and associated structural styles;
Horizons and faults picking, seismic attributes for structural interpretation.
Time to Depth conversion, Kriging and Mapping;
Different types of structural trap, associated Gross Rock Volume (GRV).
– Stratigraphic interpretation => Reservoir characterization (extension, facies, quality)
The strati-seismic method: Geomorphologies and attributes. Examples in clastic and carbonate domains.
Reservoir quality prediction using inversion, neural network classifications and pseudo-seismic cubes;
New tools for stratigraphic interpretation: Geotime, Spectral Decomposition,
– Fluid Interpretation => Fluid characterization (HC presence/DHI and type)
Direct Indicators of Hydrocarbons (DHI): Definition, origins, recognition criteria and potential artifacts.
Reflectivity vs. Angle, Amplitude vs. Offset (AVO); Specific attributes for AVO effect;
4D seismic for field production monitoring
Chapter 4: Volume and Risk Assessment
Equation of prospective resources, reminder on distributions.
Main uncertainties (GRV, reservoir and fluid parameters).
Probability of success, the 5 geological risk factors.
Definition of contingent resources (appraisal stage) and reserves (development phase)
Chapter 5: Geophysics for HSE and Well Preparation
–Prevention of drilling risks using seismic 3D HR (for shallow gas, geohazards) and interval velocities (for over-pressured zones)
Chapter 6: Summary, Conclusions
-Key take away messages; Evaluation Test / Quiz
Chapter 7: Perspectives for the Energy Transition
– What roles for geophysics in a world in energy transition?
– Focus on CO2 capture and storage (CCS), geothermal energy, offshore wind farms
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