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E-100 - Seismic Reflection Fundamentals

5 days GEP/SEISREF
Level
Foundation
Audience
  • E&P professionals with no or weak experience in seismic
Purpose
  • To provide a thorough understanding of seismic reflection and its use
  • To acquire concept in imaging subsurface for geological interpretation purposes
Learning Objectives
  • To assess main steps of seismic reflection workflow, from acquisition to interpretation
  • To understand fundamentals of seismic wave propagation with relation to petrophysical properties of subsurface
  • To grasp methodology of surface and borehole seismic acquisition, processing and interpretation
Ways and means
  • Interactive presentations, exercises, document analysis and videos

Welcome - Introduction to seismic reflection
Seismic waves propagation and signal processing
  • Seismic waves, rock velocities and densities, Snell-Descartes laws
  • Reflection coefficients, acoustic impedance
  • Seismic reflexion principle - Seismic shot gathers
  • Seismic signal vs Seismic noises – Time domain vs Frequency domain
  • Time and space sampling
Seismic acquisition
  • 2D and 3D seismics, land, marine, sea bottom seismics
  • Seismic sources (explosive, vibroseis, air guns…)
  • Seismic receivers (geophones, MEMS, hydrophones…)
  • Streamer, OBC, nodes, shallow water, transition zone…
Seismic processing and imaging
  • Seismic processing workflows, post-stack versus pre-stack
  • Enhance signal versus noise
  • CMP/Bin, Static corrections, dynamic corrections, velocity analysis
  • Stack, post-stack migrations, pre-stack migrations (PSTM – PSDM)
Borehole seismic
  • Theory and principles, synthetic seismogram and well tie
  • Vertical Seismic Profile (VSP), Offset Seismic Profile (OSP), walkaway
  • Seismic While Drilling (SWD)
  • Examples and applications
Seismic interpretation
  • Principles and methodology, seismic interpretation pitfalls
  • 2D seismic interpretation practice (on paper)
Seismic for reservoir analysis
  • Seismic amplitudes analysis, Direct Hydrocarbon Indicators (DHI), seismic attributes analysis
  • HR – HQ – HD – Broadband seismic, 4D Seismic
  • Multi-component seismic, P waves versus S waves
  • AVO-AVA processing and analysis, seismic inversion
Conclusion and synthesis