Practical Depth Conversion and Depth Imaging for the Interpreter

Reservoir Description and Dynamics


The following Depth Conversion and Velocity topics will be covered:

  •  Overview of Depth Conversion
  •  Sources of Velocity / Defining Velocity Types
  • Well and Seismic Data Integration
  • Vertical Time-to-Depth Conversion (Basic)
  • Applications and Pitfalls of Vertical Depth Conversion
  • Time and Depth Migration: Comparisons       
  • Migration Algorithms: Theory and Practice
  • Tomographic Velocity Analysis
  • Well/Seismic  Validation
  • Anisotropy
  • Well Calibration


Depth conversion of time interpretations is a basic skill set for interpreters. There is no single methodology that is optimal for all cases. Next, appropriate depth methods will be presented. Depth imaging should be considered an integral component of interpretation. If the results derived from depth imaging are intended to mitigate risk, the interpreter must actively guide the process.

Participants will gain an understanding of depth conversion methodologies and QCs for validity of methods used. Also, they will learn how to effectively design, guide, and quality control depth-imaging projects in a variety of geologic settings and be able to:

    1. Assess the various sources and utility of velocities
    2. Learn the types of velocities plus methods of defining and accessing them
    3. Investigate the compatibility of well and seismic data using synthetics and other methods
    4. Assess the differences between time and depth migration
    5. Characterize the underlying theory between ray and wave-equation methods
    6. Assess the differences between migration algorithms
    7. Appraise the form of velocity updating (tomography) appropriate for the geology
    8. Plan and review QCs for iterative velocity updates
    9. Assess the method used for determining anisotropic parameters
    10. Implement an optimal approach for calibrating well and seismic data

Who Should Attend

This course is aimed toward Geoscientists involved in seismic interpretation and subsequent time-to-depth conversion, in addition to incorporating pre-stack depth migration into their seismic evaluations.


Pavel Vasilyev studied at Moscow State University's Faculty of Geology in Moscow, Russia. His experience includes developing his expertsie at Schlumberger PTS, Abu Dhabi, UAE, supervising and providing technical support for Depth Imaging groups (Production, Clients) ADMA, ADCO, Al Dhafra, improving turnaround and performing the first DI projects in Abu Dhabi Center, plus well constrained updates and azimuthal anisotropy analysis. In addition, Vasilyev has built and trained DI groups in Abu Dhabi.