초록 ▼

A method of seismic prospecting is disclosed in which the seismic source is excited in such a manner as to maximize the use of the energy generated by the seismic source. In certain cases it may be desirable to convert the received seismic signals to their frequency domain counterparts before perfor

A method of seismic prospecting is disclosed in which the seismic source is excited in such a manner as to maximize the use of the energy generated by the seismic source. In certain cases it may be desirable to convert the received seismic signals to their frequency domain counterparts before performing subsequent processing. Such conversion may be performed using the discrete Fourier transform with the result that transformed values are obtained only at certain discrete frequencies. It may further be desirable that processing be performed only at subsets of the total set of discrete frequencies with the values at the remaining frequencies being discarded. In the practice of the present invention, source energy is generated only at those discrete frequencies at which subsequent processing is to be performed. As a result there is substantially no source energy in the transform values at the frequencies which are discarded.

대표청구항 ▼

A method of seismic prospecting comprising the steps of: (a) imparting energy into the earth, the time variability of said energy being such that the power density spectrum of said energy has substantially non-zero values only at certain evenly spaced discrete frequencies, (b) using a seismic receiv

A method of seismic prospecting comprising the steps of: (a) imparting energy into the earth, the time variability of said energy being such that the power density spectrum of said energy has substantially non-zero values only at certain evenly spaced discrete frequencies, (b) using a seismic receiver to generate an electrical signal representative of said energy after propagation through the earth, and (c) converting a segment of said electrical signal to the frequency domain, said segment having a time duration T, wherein the frequency spacing between any adjacent pair of discrete frequencies at which said spectrum has substantially non-zero values is greater than 1/T.