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

Language

English

Audience type

Master Degree 3-5

Planned duration

24 hours maximum (can be adjusted to 21 hrs)

Support material

PowerPoint slides

Prerequisite

Basics of Petroleum Geology

Objectives

Introduction to geophysical techniques and methods for students in Geosciences (hydrocarbon exploration-production + energy transition)

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