Velocity Modeling and Seismic Depth Conversion
Duration: 5 Days
Target Audience: Geophysicists, Geologists, Seismic Interpreters, Exploration Managers, Reservoir Engineers
Delivery Mode: Classroom / Virtual with Hands-On Software Exercises
Level: Intermediate
Course Overview
This course covers the principles and practical workflows for building velocity models and performing depth conversion of seismic data. Participants will gain expertise in integrating well, checkshot, VSP, and seismic velocity data to create accurate time-to-depth conversions for seismic interpretation and reservoir mapping.
Day-by-Day Outline
Day 1 – Fundamentals of Seismic Velocities
- Types of seismic velocities: interval, RMS, average, stacking
- Velocity anisotropy concepts (VTI, HTI)
- Well checkshot and VSP surveys: acquisition, processing, interpretation
- Time-depth relationship fundamentals
- Exercise: Calculate interval and average velocities from checkshot data
Day 2 – Building Velocity Models
- Layer-based vs. grid-based velocity models
- Integrating well velocity data with seismic stacking velocities
- Using seismic horizons as velocity control points
- Lateral velocity variations and compaction trends
- Workshop: Construct a basic 1D velocity model for a well
Day 3 – Seismic Depth Conversion Methods
- Common depth conversion techniques: constant velocity, linear trend, layer cake
- Geostatistical and kriging-based approaches
- Handling velocity uncertainties and depth conversion errors
- Depth conversion in structurally complex settings
- Exercise: Apply different depth conversion methods on a 2D seismic line
Day 4 – Advanced Velocity Modeling and Calibration
- Building 3D velocity models from multiple wells and seismic data
- Calibrating models with well tops and seismic horizons
- Incorporating velocity anisotropy corrections
- Time-to-depth mis-tie analysis and corrections
- Workshop: Develop a 3D velocity model with integrated well-seismic control
Day 5 – Application to Structural Interpretation and Reservoir Mapping
- Generating depth structure maps for reservoir zones
- Time-depth conversion of seismic attributes (amplitude, AVO)
- Case studies of exploration successes and failures due to velocity errors
- Uncertainty analysis and risk mitigation in depth conversion
- Capstone Project: Build and apply a velocity model for depth converting a seismic section and create depth maps
Expected Learning Outcomes
- Understand seismic velocity types and their significance in exploration
- Build and calibrate 1D and 3D velocity models integrating well and seismic data
- Apply appropriate depth conversion techniques in different geologic settings
- Generate accurate depth maps for reservoirs and structural traps
- Quantify uncertainties and improve confidence in depth-based interpretations
Customizable Add-ons
Tailored content for local geology
Lab visit or simulation hands-on demo
Integration with economics or production courses
Special Customization for Regional NOCs
- Includes legal and fiscal case examples from MENA &Africa
- Arabic-English bilingual delivery available
- Tailored licensing round simulation exercises
- Optional site visits to local oilfields or regulatory agencies
Trainer Profile
- Senior reservoir and exploration engineers from IOCs and NOCs
- Former advisors to government ministries
- Experts in petroleum contracts and economic modeling
Certification
Participants will receive a Certificate of Completion and a performance report including assessment outcomes and instructor feedback.
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