Depth Conversion and Velocity
- Module 1: Overview of Depth Conversion
- Module 2: Sources of Velocity
- Module 3: Defining Velocity Types
- Module 4: Representation of Velocities
Learn the motivation for vertical time-to-depth conversion and the common sources of velocity information. Review definitions and characteristics of velocities, as well as how to define velocities fields using vertical and spatial functions.
Data Integration and Vertical Time-to-Depth Conversion
- Module 5: Well and Seismic Data Integration
- Module 6: Vertical Time-to-Depth Conversion (Basic)
- Module 7: Vertical Time-to-Depth Conversion (Advanced)
Focus on data integration and vertical time-to-depth conversion. Learn how to understand the methods for linking well and seismic information. Additionally, cover the implementation of basic depth conversion using vertical functions and spatial corrections, as well as exploring depth conversion using more sophisticated methods.
Vertical Depth Conversion and Depth Migration
- Module 8: Applications and Pitfalls of Vertical Depth Conversion
- Module 9: Acquisition and Time Processing
- Module 10: Time and Depth Migration: Comparisons
- Module 11: Migration Algorithms: Theory and Practice
Learn about the accuracy of vertical time-to-depth methods and what happens when they fail. Also, learn to appreciate the impact that acquisition and signal processing have on imaging, as well as the differences between time and depth imaging in context of the different depth migration algorithms.
Parameter Selection, Velocity Analysis, Depth Imaging Grids, and Data Validation
- Module 12: Migration: Parameter Selection
- Module 13: Tomographic Velocity Analysis
- Module 14: Depth Imaging Grids
- Module 15: Well/Seismic Database Validation
Review the impact of parameter selection for imaging and learn to understand the differences and resultant solutions from various approaches to tomography. Discuss the different grids that need to be defined in depth imaging. Most importantly, review methods for correcting the database prior to incorporating well control.
Quality Control, Anisotropy, Well Calibration, and Attributes
- Module 16: Iterative Depth Imaging: Quality Control
- Module 17: Anisotropy
- Module 18: Well Calibration
- Module 19: Attributes
Incorporate a set of fundamental review steps in depth imaging projects, and learn to appreciate the basic concepts for imaging and defining anisotropic parameters. Review the basic QCs for stable integration with well control, ending the day with learning about utilizing attributes derived from depth imaging and subsequent inversion.
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:
- Assess the various sources and utility of velocities
- Learn the types of velocities plus methods of defining and accessing them
- Investigate the compatibility of well and seismic data using synthetics and other methods
- Perform basic and advanced depth conversions of time data and characterize the errors
- Judge the limits of vertical depth conversion with increasingly extreme geologic situations
- Supervise initial time processing of data and methods to mitigate acquisition shortcomings
- Assess the differences between time and depth migration
- Characterize the underlying theory between ray and wave-equation methods
- Parameterize migration algorithms
- Appraise the form of velocity updating (tomography) appropriate for the geology
- Establish target velocity resolution for tomography and associated grids (tomo cells, gathers...)
- Validate and correct the database via well and seismic ties
- Plan and review QCs for iterative velocity updates
- Assess the method used for determining anisotropic parameters
- Implement an optimal approach for calibrating well and seismic data
- Evaluate attributes such as inversion and (HTI) directional stress and lithology estimates
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.
A basic background in geophysical interpretation, as well as some experience in time-to-depth conversion of seismic time horizons.