Methods and apparatus for electromagnetic surveying using dynamically-selected source waveforms
AssigneePGS Geophysical AS
InventorsRobert JUHASZ, Peter LINDQVIST
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Abstract
Disclosed are methods and apparatus for electromagnetic surveying using dynamically-selected source waveforms. In accordance with an embodiment of the invention, a source waveform is adapted by dynamically selecting a source waveform from the set of pre-calculated waveform sequences. The dynamic selection of the source waveform may depend on a measured background noise level. Other embodiments, aspects, and features are also disclosed.
Claims19
A method for electromagnetic surveying of a subsurface formation, the method comprising:
- transmitting an outgoing electromagnetic signal which is based on a source waveform;
- detecting, using at least one electromagnetic sensor, a responsive electromagnetic signal;
- obtaining a receiver signal which is based on the responsive electromagnetic signal;
- and
- adapting the source waveform by dynamic selection of the source waveform from a set of pre-calculated waveform sequences.
An apparatus for electromagnetic surveying of a subsurface formation, the apparatus comprising:
- a receiver for detecting a responsive electromagnetic signal so as to obtain a receiver signal;
- a source adaptor for adapting a source waveform using at least the receiver signal;
- an antenna for transmitting an outgoing electromagnetic signal which is an amplified version of the source waveform;
- and
- a set of pre-calculated waveform sequences stored in data storage,
- wherein the source adaptor comprises a source selector for dynamically selecting a source waveform from the set of pre-calculated waveform sequences.
Dependencies are inferred from the claim text.