A method for hydrocarbon reservoir mapping and apparatus for...

G - Physics – 01 – V

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G01V 3/08 (2006.01) G01V 3/15 (2006.01)

Patent

CA 2628111

A method is proposed for a marine electromagnetic survey based on the TM mode, for the purpose of prospecting for and detecting subsurface hydrocarbon reservoirs . The method includes an electromagnetic field source (1113) that, in a submerged, essentially vertical transmitter antenna, generates and injects electric current pulses (81,82) with a sharply defined termination. An electromagnetic field generated by these pulses (81,82) is measured by at least one receiver (1109) provided with an essentially vertical receiver antenna (1111) submerged in water, during the interval when the current in the transmitter antenna (1108) of the electromagnetic field source (1113) is switched off . The distance between the electromagnetic field source (1113) and the at least one receiver (1109) is smaller than the depth of the target object. An apparatus is also described, for implementation of the method.

L'invention concerne un procédé de relevé électromagnétique marin basé sur le mode TM, en vue de prospecter et de détecter des réservoirs d'hydrocarbures sous la surface. Le procédé fait appel à une source (1113) de champ électromagnétique qui, dans une antenne émettrice immergée essentiellement verticale, génère et injecte des impulsions (81,82) de courant électrique interrompues de façon abrupte. Un champ électromagnétique généré par ces impulsions (81,82) est mesuré par au moins un récepteur (1109) pourvu d'une antenne réceptrice (1111) essentiellement verticale immergée dans l'eau, pendant l'intervalle où le courant dans l'antenne émettrice (1108) de la source (1113) de champ électromagnétique est coupé. La distance entre la source (1113) de champ électromagnétique et ledit ou lesdits récepteurs (1109) est inférieure à la profondeur de l'objet visé. L'invention concerne également un appareil destiné à la mise en AEuvre du procédé.

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