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AssigneesInstitut Francais du Petrole, Gaz de France Compagnie Generale de Geophysique
InventorJulien Meunier
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Seismic wave reception device comprising a hydrophone and/or a geophone and method for coupling it (or them) with a solid medium such as the subsoil. The device comprises at least one hydrophone (2) immersed in a closed flexible-walled sheath (7) filled with liquid (8) that is closed at one end by a sealed plug (9) provided with a sealed duct for a cable (10) connecting the hydrophone to a signal acquisition means (E). The sheath is arranged in a cavity (6) and tightly coupled with medium (5) substantially over the total surface thereof, preferably by means of a hardenable material such as cement. A geophone can be placed in the same coupling material in the vicinity of sheath (7) containing hydrophone (2). Application: seismic prospecting or monitoring operations in an underground formation, notably in order to discriminate the seismic upgoing and downgoing waves.
A reception device intended for seismic waves coming from a solid medium (5) such as the subsoil, comprising at least one hydrophone (2) in a cavity (6) of the medium and coupled therewith, characterized in that it comprises a closed flexible walled sheath (7) intended to be tightly coupled with the medium substantially over the total surface thereof, this sheath being filled with a liquid (8) in which hydrophone (2) is immnersed, and closed at one end by a sealed plug (9) provided with a sealed duct for a cable (10) connecting the hydrophone to a signal acquisition means (E).
A method for coupling a seismic wave reception device comprising at least one hydrophone with a solid medium (5) such as the subsoil, wherein a cavity allowing it to be buried in the medium is provided, characterized in that hydrophone (2) is immersed in a closed flexible-walled sheath (7) filled with a liquid (8), closed at one end by a sealed plug (9) provided with a sealed duct for a cable (10) connecting the hydrophone to a signal acquisition device (E), and substantially the entire flexible wall of sheath (7) is coupled with the medium by injecting into the cavity around the sheath a hardenable material such as cement.
Dependencies are inferred from the claim text.