Method for csem exploration in polar regions

G - Physics – 01 – V

Patent

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G01V 3/12 (2006.01)

Patent

CA 2612259

There is provided herein methods of collecting, EM data in the context (s) of hydrocarbon exploration, appraisal, development, and surveillance, which provides improved ground coupling between the electrodes and the earth or surface ice and, as a consequence, a higher quality transmitted and received signal is obtained thereby. Where the surface of the ground is saturated and frozen (e.g., in the case of a survey conducted on sea ice or frozen tundra) , the survey instruments (sources and receivers) may be coupled more faithfully to the surface by drilling or melting holes into the ice (or frozen tundra) and inserting electrodes into the resulting holes. Each hole may (or may not) be lined with material to retard the loss of water therefrom. Preferably, each of the holes (source and receiver) will be filled with water (fresh or salt) before data collection begins.

L'invention concerne un procédé et un système permettant de recueillir des données électromagnétiques dans un ou plusieurs contextes de prospection, d'évaluation, de développement et de surveillance des gisements d'hydrocarbures, qui permet d'améliorer le couplage au sol entre les électrodes et la terre ou la glace de surface et, par conséquent, d'obtenir un signal transmis et reçu de meilleure qualité. Aux endroits où la surface du sol est saturée et gelée (par exemple, dans le cas d'une étude menée sur la glace marine ou la toundra gelée), les instruments de d'étude (sources et récepteur) peuvent être couplés plus fidèlement à la surface par le forage de trous dans la glace (ou la toundra gelée) et l'introduction d'électrodes dans ces trous. Chaque trou peut éventuellement être revêtu d'un matériau servant à retarder la perte d'eau. De préférence, chaque trou (source et récepteur) est rempli d'eau (douce ou salée) avant que ne commence la collecte de données.

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