BUILDING METHOD OF SEISMIC DEPTH SECTION Russian patent published in 2011 - IPC G01V1/28 

FIELD: mining.

SUBSTANCE: for obtaining the image of seismic depth section, each displayed point (DP) is applied in series to the section along columns and/or lines with the specified pitch along axes of coordinates as a result of review of wave field on n seismograms recorded with multifold profiling method. Review is performed by searching the signals of seismic boundaries possibly crossing/containing DP and belonging to one of q specified aspects of the object (seismic model). For each aspect of the object at the specified velocity section on seismograms there built are q virtual hodographs of the wave of the specified type in compliance with routes of ray path from n impact stations (IS) considering the specified configuration of the object boundaries. There obtained are m marker pips of arrival time of rays of secondary waves possibly outgoing from DP and the sequence adjoining the DP from m points along the boundary. After that, before and after marker pips of arrival times of rays along each hodograph there performed is pseudo-inphase accumulation per ρ (usually ρ<20) of references of signal amplitudes from each of the specified amount of m seismic routes in n seismograms. Results of q×n massifs of accumulations are grouped as per the criterion of belonging to each of q positions and after summation/multiplication of ρ×m amplitudes of vibrations in n seismograms for one and the same position of the object there obtained is ρ×m×n ratio of super accumulations. As per results of pseudo-inphase super accumulations there calculated by using certain methods are q composed functions of statistical processing and compared to each other. Maximum value of probability of determination is obtained. It is compared to the specified threshold of noise level, standardised considering the scale of the image and point/section of seismic boundary at depth section is displayed. In some cases there corrected are the specified review parametres to reach the maximum of probability value of the boundary determination. All the rest neighbouring DP are applied by using such review method of wave field to depth seismic section in compliance with the specified pitch of coordinate increments. The task of the invention is to develop the method providing high reliability and accuracy of displaying the seismic objects and media of high complexity.

EFFECT: increasing by tens of times of the signal-noise ratio and suppression degree of occasional and regular noise waves, excluding the impact of deviation and loops on hodographs when building the depth geological-geophysical sections.

3 cl, 5 dwg