Method and device for optimization of seismic data
AssigneesSociete Nationale Elf Aquitaine (Production), Compagnie Generale de Geophysique
InventorsSerge Vannier, Robert Garotta, Andre Lozes, Jean C. Vidal
Life of this patent
Estimating the term…
Abstract
In a method and device for the study of surface layers and subjacent layers of interest, the device comprises receivers and at least two transmission sources spaced at a distance such that a set of traces produced by one of the transmission sources does not interfere with a set of traces produced by the other transmission source when the two sets of traces are on the same time-section.
Claims24
A method of optimization of seismic data during exploration of a medium, comprising:
- emitting from at least a first transmission source a first series of first long signals having alternating polarities and containing a predetermined frequency spectrum;
- emitting at the same instant, from at least one second transmission source which is separate and distinct from the first source a second series of second signals having a constant polarity and having energy levels different from the energy levels of said first signals;
- receiving and recording both series of signals after propagation through the medium to be explored;
- grouping into pairs recorded signals of said first series having opposite polarities;
- grouping into pairs recorded signals of said second series having the same polarity as each other and corresponding in transmission time, respectively, to signals in pairs of said first group;
- adding the pairs of said first group;
- adding the pairs of said second group;
- and
- cross correlating the sums produced by each addition with the signal emitted by the corresponding transmission source.
An invention comprising a first transmission source for emitting a first series of first signals having alternating polarities add containing a predetermined frequency spectrum;
- a second transmission source for emitting a second series of second signals having a constant polarity and having energy levels different from the energy levels of said first signals;
- and
- means for receiving and recording both series of signals after propagation through a medium to be explored, grouping said first series of recorded signals into pairs having opposite polarities, grouping said second series of recorded signals into pairs having the same polarity as each other and corresponding in transmission time, respectively, to signals in pairs of first group, adding the pairs of said first group, adding the pairs of said second group, and cross correlating the sums produced by each addition with the signal emitted by the corresponding transmission source.
Dependencies are inferred from the claim text.