Statoil Asa

Tage Røsten

Lasse Amundsen

A method of analyzing an electromagnetic wavefield includes the steps of measuring the electric and magnetic fields at at least one receiver, formulating a respective spatial domain filter in respect of each of mutually orthogonal components of each of the electric and magnetic fields, and applying the filters to the measured acquired data to decompose the wavefield into upgoing and downgoing components.

Electromagnetic wavefield analysis

A method of deriving a calibration filter for electromagnetic data is provided. The method comprises providing a source () of electromagnetic radiation and subsequently measuring components of the source electromagnetic field () at a receiver when the source is sufficiently close to the receiver that the down-going signal dominates over the up-going signal reflected from features below the receiver. Such a measurement can be used in frequency domain analysis () to extract the down-going signal component and derive a calibration filter for the receiver. The method is repeated () for each receiver used in an electromagnetic sounding survey.

Growing community of inventors

Trondheim, Norway

Tage Røsten