초록 ▼

A marine seismic reflection prospecting system attenuates coherent noise through reinforcement of primary reflection data by the addition of corrected ghost reflection data. The system includes a seismic energy source, a detector, a wavefield separator, a time-shift element, and an element for gener

A marine seismic reflection prospecting system attenuates coherent noise through reinforcement of primary reflection data by the addition of corrected ghost reflection data. The system includes a seismic energy source, a detector, a wavefield separator, a time-shift element, and an element for generating an output signal representative of an additive linear combination of time-aligned primary and ghost signal components. The system\s output is suitable for further pre-stack processing, e.g., NMO correction.

대표청구항 ▼

An improved method for generating pre-stack seismic reflection data for use in geophysical prospecting of water covered areas, said method being free of filter means including a deconvolution operation having a predetermined amount of white noise added to the zero lag of the autocorrelation for chan

An improved method for generating pre-stack seismic reflection data for use in geophysical prospecting of water covered areas, said method being free of filter means including a deconvolution operation having a predetermined amount of white noise added to the zero lag of the autocorrelation for changing the frequency content of any one of pressure-detecting and velocity-detecting elements, said method comprising the steps of A. generating a seismic wave for reflection from earth strata, B. detecting a resultant seismic wave and for generating a signal representative thereof, C. separating said resultant seismic wave into (i) a first signal component representative of propagation of said resultant seismic wave in a first direction through said water, (ii) a second signal component representative of propagation of said resultant seismic wave in a second direction through said water, and generating signals representative thereof, D. time-shifting said first and second signal component relative one another and for generating, respectively, first and second time-aligned signals representative thereof, said time-shifting step including the steps of (i) generating a signal representative of time associated with travel of said seismic wave between said detection means and a surface of said water, (ii) time-shifting said first and second signal components relative to one another as a function of said travel-associated signal; and E. additively linearly combining said first and second time-aligned signals to generate an enhanced pre-stack seismic wave signal and, thus, to attenuate coherent noise in said detected resultant seismic signal.