Westerngeco L.l.p.

Cgg Marine (norway) As

Johan-Fredrik Synnevaag

Jon-Fredrik Hopperstad

Pieter Leonard Vermeer

Anneli Soppi

Presented are methods and systems for deghosting seismic trace data. A cost function and one or more applicable constraints are selected and used to generate a time-variant deghosting filter. The time-variant deghosting filter can be recalculated for predetermined time intervals over the span of the associated seismic data. The time-variant deghosting filter is then applied to the seismic trace data to attenuate ghosts within the predetermined time interval. A plurality of seismic trace data can be stacked before generating and applying the time-variant deghosting filter.

Removing ghost reflections from marine seismic data

A seismic source arraycomprises a plurality of seismic sourcearranged about a central point of the source arrayin such a way that an imaginary circle drawn with said central point at its center, and containing all of said seismic sources, can be divided into at least three whole sectors each of which contains a substantially identical arrangement of seismic sources

Seismic source arrays

A device including a housing defining a first chamber and a port formed through the housing. A shuttle flange moveably positioned within the first chamber. The shuttle flange moves during a gas-release cycle between i) a closed position blocking the port, and ii) an open position exposing an exit area of the port through which a compressed gas is discharged. A method for generating a seismic pressure pulse in water includes the steps of, confining a compressed gas within a chamber having a port, creating an exit area through the port by moving a shuttle along the length of the port during a gas-release cycle, pre-releasing a charge of the compressed gas through the exit area to create a pre-released bubble, choking the exit area, and producing a primary pressure pulse by releasing a main charge of compressed gas through the exit area.

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Oslo, Norway

Johan-Fredrik Synnevaag