Electroseismic technique for measuring the properties of...

G - Physics – 01 – V

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G01V 11/00 (2006.01) G01V 3/26 (2006.01)

Patent

CA 2234258

Apparatus and method for measuring the properties of rocks such as permeability, porosity and fluid properties downhole around a borehole (3) in which a seismic source (6) which radiates a seismic signal substantially radially within the borehole is lowered down the borehole (3) and the electrical signal generated by the seismic signal within the surrounding rock is detected by detectors (4, 5) mounted above and below the seismic source (6) so that signals are received from substantially all radial directions. Preferably a continuous wave signal is generated and the signal detected whilst the apparatus (1) is raised or lowered. The apparatus (1) gives a much better and more accurate measurement than previous methods.

Dispositif et procédé servant à mesurer les propriétés de roches, telles que la perméabilité ou la porosité, ainsi que les propriétés de fluides autour du fond d'un puits de forage (3) dans lequel on fait descendre une source sismique (6) mettant un signal sismique dans un sens sensiblement radial à l'intérieur du puits et le signal électrique généré par le signal sismique à l'intérieur de la roche environnante est détecté par des détecteurs (4, 5) montés au-dessus et au-dessous de la source sismique (6), de telle manière que des signaux sont reçus depuis pratiquement toutes les directions radiales. Un signal d'onde continue est, de préférence, généré et le signal est détecté pendant qu'on élève ou qu'on fait descendre le dispositif (1). Ce dernier permet d'obtenir des mesures beaucoup plus claires et beaucoup plus précises que les procédés de l'état actuel de la technique.

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