Fast 3-D inversion algorithms

What is it about?

We outline a number of algorithms that can be used for the interpretation of 3-D electromagnetic data. The algorithms differ by the type of the electromagnetic data to be interpreted and the geological situation in the area of investigation. Each algorithm is based on a thin-sheet model. Each model comprises one or several inhomogeneous layers and an embedding 1-D medium. The algorithms typically take a few minutes per period to run on a PC if used on a numeric grid of up to 104 nodes. They can also be used for inversion of time-domain and controlled source data.

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Why is it important?

In many situations, the thin layer inversion algorithms allow for determining the essential and robust parameters of the earth cross section. In other cases, they may be used as a starting point for the full-blown 3D inversion.