Detection of resistivity of offshore seismic structures...

G - Physics – 01 – V

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G01V 3/08 (2006.01) G01D 11/10 (2006.01) G01D 11/16 (2006.01) G01R 33/02 (2006.01) G01V 3/40 (2006.01)

Patent

CA 2636818

The invention measures the vertical component Hz of a magnetic field arising from natural sources (MT) simultaneously at a plurality of points on the sea floor to determine places having a non-zero vertical component Hz indicative of an edge of a resistive body (structure), in order to determine whether or not a sub-bottom geologic structure, known from marine seismic measurements, exhibits a resistivity contrast with the surrounding rocks, a positive contrast being interpreted as indicating hydrocarbon charge within the structure.

L'invention concerne la mesure d'une composante verticale Hz d'un champ magnétique de sources naturelles (MT) se produisant simultanément au niveau de plusieurs points sur le fond de l'océan, ce qui permet de déterminer les endroits comprenant une composante verticale Hz non nulle qui indique le bord d'un corps (structure) résistif afin de déterminer si la structure géologique de sous-sol du fond connue à partir de mesures sismiques marines, présente ou non un contraste de résistivité avec les roches environnantes, un contraste positif étant interprété comme une indication de charge d'hydrocarbures dans ladite structure.

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