|
<< Click to Display Table of Contents >> Navigation: General > 4D picking |
Interactive tool for picking seismic horizons, mutes, or time gates on individual traces or gathers in time-lapse (4D) seismic workflows. Enables the user to pick and compare reflection events across multiple seismic vintages at the same subsurface location, helping quantify time shifts, amplitude changes, and other 4D attributes. Picking is performed gather-by-gather, navigating by inline/CDP and crossline. Use this module after conditioning of baseline and monitor datasets and before 4D attribute extraction or time-shift analysis.
The primary seismic dataset on which picking is performed — the main seismic volume displayed in the picking window.
A handle to an open, pre-indexed SEG-Y file enabling random-access reading of individual gathers without loading the full volume into memory.
A pre-computed trace header index defining the gather structure (e.g., sorted by inline/crossline or CDP) used to navigate between gathers.
Name identifier for the picking dataset, used to distinguish multiple picking sets within the same project.
The storage object where all picked time values accumulate and are saved. Previously saved picks reload automatically for review and editing.
The inline or CDP number of the currently displayed gather. Change to navigate to a location of interest (well location, 4D anomaly). Constrained to the range available in the input dataset.
The crossline number defining the 3D gather location together with Inline/CDP. Not applicable for 2D surveys.
Number of adjacent gathers displayed simultaneously, centred on the current location. Typical range: 3–9. Larger values aid lateral correlation in noisy or structurally complex areas.
Toggle to display the time corridor (gate) around each pick as a bracketing overlay, helping verify consistent event tracking across gathers — especially critical for detecting subtle 4D time shifts.
Half-width of the time corridor in milliseconds. Defines the snap search range and the displayed gate. Recommended: approximately half the dominant period (12–15 ms for 40 Hz data). Use 8–12 ms in 4D workflows to avoid capturing time-shifted events from adjacent vintages.