2D vs 3D seismic: what's the difference?
Two ways of imaging the subsurface, built for different questions. A plain-language guide for buyers and sellers.
2D seismic is acquired along single lines. Each line produces a cross-section of the subsurface, and a grid of lines gives a regional picture. It is generally quicker and cheaper to acquire, which makes it the usual tool for early exploration and for understanding a basin's broad structure.
3D seismic is acquired over an area with closely spaced lines, producing a continuous volume of data. Interpreters can slice it in any direction, which makes it far better for mapping individual prospects, faults and reservoirs in detail before a well is drilled.
Age is not the whole story. Older surveys can often be reprocessed with modern techniques, sometimes revealing much more than the original processing did. When comparing data, buyers look at coverage over their area, the vintage of acquisition, how the data was processed (for example time or depth migration) and overall quality.
For sellers, both types can be in demand: 2D for regional screening and 3D for prospect-level work. For buyers, the right choice depends on the question being asked and the stage of the project.
We help buyers compare what exists over their acreage on exactly these points, and help sellers describe their data in the terms buyers actually use.