Multi-component seismic vibratory source for use in marine envir

Details Multi-component seismic vibratory source for use in marine envir Multi-component seismic vibratory source for use in marine envir

1991-06-06

1992-07-07

Eldred, J. W.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367143, 367173, 181110, 181114, 181121, G01V 100

Patent

active

051289008

ABSTRACT:
The method and apparatus for providing elliptical polarized shear waves in a marine environment in which a shear wave source penetrates the surface sediment of a water bottom includes dual actuator/reaction mass system mounted inside a structural ring of a conical housing section. A cross shaped structure at the top of the apparatus serves as a passive reaction mass and as a moment arm support for reversibly motor driven propellers enclosed in shrouds at the outer ends of the cross shaped structure. A thruster system provides dynamic positioning. The cross shaped structure and housing section are connected by a structurally stiff member, such as a vertical tube. Pistons provide actuation of two reaction masses located within the housing structure, and the motions of the reaction masses generate shear waves which propagate in the subsurface formations.

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