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AssigneeReflection Marine Norge AS
InventorsDavid Fraser Halliday, Jon-Fredrik Hopperstad, Robert Montgomery Laws
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Marine seismic surveys, including ocean bottom surveys, utilizing marine vibrator arrays that are capable of being driven in anti-phase to produce a directional source gradient. Marine seismic surveys may include activating the vibrator array to emit a plurality of radiation patterns with at least a first radiation pattern that has a first notch at a take-off angle that is not close to vertical. Some marine seismic surveys included emitting directive wavefields from two or more simultaneous seismic source arrays, where the two or more seismic source arrays have a phase that changes from shot-to-shot to allow simultaneous source separation of the directive wavefields.
A marine seismic survey method, comprising activating a vibrator array of two or more marine vibrators to emit a plurality of directive wavefields with at least a first directive wavefield that has a first notch at a take-off angle that is not close to vertical, and less than a maximum take-off angle of interest, and at least a second directive wavefield that does not have a notch at a take-off angle close to that first notch.
Dependencies are inferred from the claim text.