Petrel Velocity Modeling

Modules 1, 2 & 3

• Preparation of well data
• Velocity model setup and output
• Velocity extraction and modification
  

On Day 1, the participants will first learn how to quality control checkshot data and define velocity intervals based on well tops. Then, they will learn about various sonic calibration procedures, the Simple velocity model functionality, the main elements of the Advanced velocity model process, the available velocity functions and the corresponding inputs and outputs created by the Advanced velocity model process. The last part of this session will also cover to the methodologies for extracting and editing velocity data used for updating velocity models.

Modules 4, 5 & 6 (Part 1)

• Depth error analysis and correction
• Surface-based seismic velocity modeling
• 3D grid-based seismic velocity modeling
  

This session will cover the depth error correction and handling of depth error residuals, as well as how to set up a depth correction model. The participants will not only learn about loading and quality controlling seismic velocities (stacking velocities), but also about performing Dix conversion using stacking velocities. Then, they will model velocity surfaces, use the velocity surfaces to build velocity models and then set up a seismic-guided well velocity model.

Finally, the 3D grid-based seismic velocity modeling module will be introduced for the participants to model stacking velocities as an average velocity and an interval velocity property in a 3D grid, derive the scaling/correction factor for both velocity types using well velocities and correct the seismic velocities by the time-varying scaling/correction factor. Then, they will use the corrected dataset for velocity modeling.

Modules 6 (Part 2), 7 & 8

• 3D grid-based seismic velocity modeling
• 3D volume - seismic velocity modeling
• User-defined velocity functions
• Domain conversion

In this final session, after completing Module 6, the participants will first learn how to alternative methods for velocity modeling, using 3D volume - seismic velocities or user-defined functions. 

One of the key objectives in building a velocity model is to be able to convert an object from one domain to another, usually from a time domain to a depth domain. Therefore, in the last part of the course, the participants will learn about domain conversion and quality control of converted objects.