Are you familiar with all the horizon trackers in OpendTect? In this post, I will briefly explain each method and when to best use each option: 🌏Manual Draw: Workflow: Draw hor...
Are you familiar with all the horizon trackers in OpendTect?
In this post, I will briefly explain each method and when to best use each option:
🌏Manual Draw: Workflow: Draw horizon on a line-by-line basis in a grid (e.g., every 10th line) on 2D viewers. Recommended to do this in the 3D scene. Ideal for: Complex events that change laterally, such as unconformities. In the 3D scene, you can draw on random lines and view the results in 3D with wells and other objects.
🌏Manual Draw with Snap to Event (Peak, Trough, Zero-Crossing): Workflow: Draw horizon on a line-by-line basis in a grid (e.g., every 10th line) on 2D viewers. Recommended to do this in the 3D scene. Ideal for: Good reflectors that do not change much laterally. In the 3D scene, you can also draw on random lines and view the results in 3D with wells and other objects.
🌏Auto-track: Workflow: Pick seeds -> Auto-track -> QC -> Edit -> Iterate in the 3D scene (recommended). Alternative: Pick seeds in a grid of lines either on 2D viewers or in the 3D scene. Ideal for: Good reflectors that do not change much laterally. Note: We absolutely do not recommend the alternative of tracking in a grid, as it takes a lot more time than the preferred and recommended auto-tracking mode.
🌏Inversion Tracking: Workflow: Pick seeds -> Run inversion -> QC -> Pick more seeds -> Iterate in the 3D scene. Ideal for: Tracking unconformities and any event. Track multiple horizons simultaneously to increase efficiency. The algorithm prevents horizons from crossing each other. Used for creating a HorizonCube; the more framework horizons, the higher the accuracy. Use a Dip Steering Cube with Planarity as input (PCA algorithm).
🌏Inversion+: Workflow: Pick seeds -> Run inversion -> QC -> Pick more seeds -> Iterate in the 3D scene. Ideal for: Good reflectors that do not change much laterally. Track multiple horizons simultaneously to increase efficiency. The algorithm prevents horizons from crossing each other. Used for creating a HorizonCube; the more framework horizons, the higher the accuracy. Use a Dip Steering Cube with Planarity as input (PCA algorithm).
🌟Key Tips: Switching Methods: Combine auto-tracking with manual interpretation for challenging parts. Switch to manual interpretation when auto-tracking becomes difficult.
Filling Gaps: Use "Fill holes only" with the "Continuous Curvature" gridding algorithm for untracked holes.
Efficient Navigation: Set desired steps (10, 20, ...) in the icon bar and use keyboard shortcuts (Z and X) to navigate efficiently in the grid. Supported in both 3D scene and 2D viewers.
Check out the attached GIF for a visual demonstration.
Feel free to connect and share your thoughts. I look forward to hearing about your preferred tracking method!
dGB Earth Sciences#OpendTect #seismic #Geoscience #SeismicInterpretation #HorizonTracking #GeophysicalAnalysis #InnovationInGeoscience
