Method for processing seismic data corresponding to acquisitions from a medium with azimuthal anisotropy

Method of processing seismic data corresponding to acquisitions carried out in a medium exhibiting azimuthal anisotropy, the method comprising the steps of:

• acquiring, for a same seismic variable and for a same ground zone, two sets of data corresponding for one and the same seismic variable and one and the same ground zone to sectors of different source/receiver pair azimuths and to sectors of azimuths perpendicular to the source/receiver pair azimuths;
• determining for each set, an average between data corresponding to perpendicular source/receiver pair azimuths;
• determining an estimation of a common part between the two sets of averaged data, said common part being the invariant part between the two sets of data;
• and
• wherein for at least one azimuth:
• the data set which corresponds to an estimate of the part common to the two sets of averaged data is subtracted from a data set corresponding to a sector along this azimuth and from a data set corresponding to a sector along a perpendicular azimuth,
• the polarity of one of the two sets of residual data that is thus obtained is inverted,
• an estimate of the part common to this one set of the two of residual data whose polarity has been inverted and to the other set of residual data is determined.

Method of processing seismic data corresponding to acquisitions carried out in a medium exhibiting azimuthal anisotropy, the method comprising the steps of:

• acquiring, for a same seismic variable and for a same ground zone, two sets of data corresponding for one and the same seismic variable and one and the same ground zone to sectors of different source/receiver pair azimuths and to sectors of azimuths perpendicular to the source/receiver pair azimuths;
• determining for each set, an average between data corresponding to perpendicular source/receiver pair azimuths;
• determining an estimation of a common part between the two sets of averaged data, said common part being the invariant part between the two sets of data;
• wherein the data are seismic amplitudes;
• wherein the data sets are cubes of seismic data;
• and
• wherein in order to determine a cube which is an estimate of a component common to at least two cubes of seismic data:
• each of these two cubes of seismic data is converted into the frequency domain to obtain for each of them a real cube and an imaginary cube,
• a cube which is an estimate of the component common to the real cubes thus obtained and a cube which is an estimate of the component common to the two imaginary cubes thus obtained, and
• the two cubes, the one real, the other imaginary, thus obtained are converted into the time domain.

Method of processing seismic data corresponding to acquisitions carried out in a medium exhibiting azimuthal anisotropy, the method comprising the steps of:

• acquiring, for a same seismic variable and for a same ground zone, two sets of data corresponding to sectors of different source/receiver pair azimuths and to sectors of azimuths perpendicular to the source/receiver pair azimuths;
• determining for each set, an average between data corresponding to perpendicular source/receiver pair azimuths;
• determining an estimation of a common part between the two sets of averaged data, said common part being the invariant part between the two sets of data;
• wherein the data are seismic amplitudes;
• wherein the data sets are cubes of seismic data;
• and
• wherein in order to determine a cube which is an estimate of a component common to at least two cubes:
• each of these cubes is converted into the frequency domain so as to deduce therefrom for each of them an amplitude cube and a phase cube,
• an estimate of the part common to the amplitude cubes thus obtained is calculated.

Method of processing seismic data corresponding to acquisitions carried out in a medium exhibiting azimuthal anisotropy, the method comprising the steps of:

• acquiring, for a same seismic variable and for a same ground zone, two sets of data corresponding to sectors of different source/receiver pair azimuths and to sectors of azimuths perpendicular to the source/receiver pair azimuths;
• determining for each set, an average between data corresponding to perpendicular source/receiver pair azimuths;
• determining an estimation of a common part between the two sets of averaged data, said common part being the invariant part between the two sets of data;
• wherein the data are seismic amplitudes;
• wherein the data sets are cubes of seismic data;
• and
• wherein in order to determine a cube which is an estimate of a component common to at least two cubes:
• each of these cubes is converted into the frequency domain so as to deduce therefrom for each of them an amplitude cube, as well as a cube corresponding to its real part and a cube corresponding to its imaginary part,
• cosine cubes and sine cubes are extracted from the cubes corresponding to the real part and from the cubes corresponding to the imaginary part,
• an estimate of the part common to the cosine cubes and an estimate of the sine cubes are calculated,
• a common-phase-data cube is deduced from the thus calculated cubes of common parts.