2.5D inversion

The mathematical process of inversion in which the modelled resistivity is allowed to vary vertically and horizontally in the same plane as a receiver line, but is made constant in the horizontal plane at 90° to the inline direction. The model is therefore 2D, but the source is simulated in 3D, which is why it is called 2.5D inversion.

2.5D inversion provides a relatively rapid method of inversion compared with full 3D inversion.