Training and Study Visit program on Pre-stack and post-stack migration of seismic data 30th January– 5th February 2017

The two-week course is designed in response to recent request from BAPEX for a professional training program on Pre-stack and Post-Stack Migration of Seismic Data.

Training Objective

The course will provide an overview of sesmic data and its interpretation. The participants are expected toenhance their knowledge and understanding on the use of sesmic data for oil and gas industries

The program comprises of classroom lectures, discussions, case studies, interaction withprofessionals and sharing of experiences.

MODULE1: FUNDAMENTAL OF SESIMIC WAVE

• Fundamental of seismic waves
• Snell’s law
• Fermat’s principle
• Seismic velocities
• Reflection and transmission

MODULE 2: SEISMIC REFLECTION AND REFRACTION

• Overview of Seismic Acquisition
• Seismic Velocity in Processing
• Normal Moveout (NMO)
• RMS, NMO, and stacking velocities
• Dix velocities
• Migration velocities 

MODULE 3: VERTICAL SEISMIC PROFILES

• Check Shot
• VSP

MODULE 4: FUNDAMENTALS OF PRE-STACK PARTICAL MIGRATIONS ALGORITHM (DMO)

• Defining DMO
• Common mid-point
• Conflicting Dips
• Relationship between Migration, NMO, and DMO

MODULE 5: SEISMIC ANISOTROPY

• Isotropic vs Anisotropic Velocity
• Effect of anisotropy on velocity analysis
• Anisotropic Reflections

MODULE 6: SEISMIC VELOCITY ANALYSIS

• Review on Stacking velocities and (NMO)
• Methods of velocity analysis
• Identification of multiples
• Iterative velocity analysis

MODULE 7: MIGRATION PRINCIPLES

• Kirchhoff Summation
• Finite-Difference Migration

MODULE 8: POST-STACK MIGRATION

• Separation versus Splitting
• Impulse Response of the One-Pass Implicit Finite-Difference 3-D Migration
• Two-Pass versus One-Pass Implicit Finite-Difference 3-D Migration in Practice
• Explicit Schemes Combined with the McClellan Transform
• The Phase-Shift-Plus Correction Method

MODULE 9: PRE-STACK TIME MIGRATION

• 3-D DMO Correction Combined with 3-D Common-Offset Migration
• Crossline Migration
• 3-D Migration Velocity Analysis
• Summary on Aspects of 3-D Pre-stack Time Migration

MODULE 10: POST-STACK DEPTH MIGRATION

• 3-D Post stack Time versus Depth Migration
• Two-Pass versus One-Pass 3-D Post stack Depth Migration
• Implicit versus Explicit 3-D Post stack Depth Migration
• 3-D Postoak Datuming

MODULE 11: PRE-STACK DEPTH MIGRATION

• Calculation of Traveltimes
• The Eikonal Equation
• Summation Strategies
• Migration Aperture
• Operator Antialiasing
• 3-D Common-Offset Depth Migration

PRACTICAL SESSIONS

Session1:

• Example of convert horizon from time to depth domain
• NMO Equation
• NMO vs Dix Velocity

Session 2:

• Seismic Velocity Analysis

Session 3:

• Velocity Model Building

Session 4:

• Post-stack and Pre-stack Time Migration

Session 5:

• Post-stack and Pre-stack Depth Migration·