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Arbitrary lines

Arbitrary lines - contains all seismic arbitrary lines created in g-Space

Right mouse button on the icon allows to:

  • Add arbitrary line
  • Clear arbitrary lines
  • Add folder

An arbitrary line is a user-drawn path through a 3D seismic cube that extracts seismic traces along any geometry — not only the native in-line / cross-line grid. Use it to follow a geological feature, connect key wells on a single panel, or build a custom cross-section through a field. The path is defined interactively in a 3D or map view and the resulting gathers appear in a dedicated 2D view.

Creating an arbitrary line

  1. Open a 3D view or Location map showing the target cube.
  2. Enable arbitrary-line creation from the view toolbar and click the cube to place successive anchor points (corners).
  3. Double-click or press Enter to finish the path. g-Space builds the bin sequence along the polyline and extracts traces for every domain available on the cube (time, depth, offset …).
  4. Manage existing lines (rename / delete / activate) from the Data manager under the Arbitrary lines node.

When you place the first point of a new line, g-Space appends a type suffix to its default name (New arbitrary line) so the different arbitrary-line types are easy to tell apart in the Data manager:

  • _2D — a line that follows existing 2D seismic lines
  • _3D — a line extracted through a 3D cube
  • _Free — a free-hand 3D line

Only lines that still carry the default name are renamed automatically, a line you have already renamed yourself keeps its name.

Parameters

  • Step — distance between consecutive bins along the line. Default 25 m.
  • Max Distance — maximum lateral distance from the polyline beyond which 3D traces are ignored when interpolating. Default 200 m.
  • Straighten on 3D view — when enabled, the line is rendered as a straight plane inside the 3D view for easier inspection.

What you can do with an arbitrary line

  • Display extracted gathers in the dedicated 2D view and pick horizons / faults on them as on any seismic section.
  • Inspect the nearest wells and nearest 2D lines to each corner — g-Space keeps per-corner associations for quick context switching.
  • Convert the extracted path into a standalone 2D line or export it to SEG-Y for sharing.

See Also