
Digital treating
After the analysis of the held testing and as a result analysis of a fundamental stuff, aprioristic cutaways ОГТ, ОПВ, ОПП, aprioristic velocity distributions and frequencies the panel of routines has been generated and their optimum arguments are instituted.
The definitive processing graph including routines of assignment of geometry of observations in true coordinates of position of posts of excitation and registration, recovery of amplitudes, the peak trimming which has been superficiallycoordinated deconvolution, subtraction of multiple and particulatefold waves, interactive police of a statics and kinematics looks as follows:
 The observation system specification statement 2D the data and geometry check
 The specification statement of arrangements of sources and recipients on the floor spaces, input of a land forms, depths of holes and zero offset arrival times by means of SPS SPS files and archival tables;;
 Calculation of aprioristic static corrections with use of zero offset arrival times and depths of holes (a datum line 0m);;
 Observation system check;;
 Input of the seismic data.
 Reading of the field seismic data in format SEGY and their recalculation in an inner format of a handling complex (FOCUS);
 Geometry assignment;
 Check of assignment of geometry;
 Making and archiving of seismograms with the stored geometry in format SEGY with infill of headers;
3. Interactive edition of all seismograms
 Evaluation test of a seismic data, careful edition of a fundamental data
 Variation of polarity of traces
 First break muting
4. Automatic edition.
 Muting applay;
 Removal of peak pressure bumps (harmonisation of amplitudes);;
 Zero balancing;
 Choice of the aprioristic kinematic law in an interactive mode
 Imaging of the aprioristic sum a CMP
 Amplitudes recovery
 amplitudes recovery taking into account decay on time (T*N , N=1.4)
 bandpass filter of 814110120 Hz
 Repressing of surface, lowvelocity waveshindrances by means of a complex of programs (LIFT)
 Manual police of static corrections for Shot and Receivers
 Audit CMP summation.
 The maiden stage of interactive police of spread corrections in profile nodal points (through each 2 km taking into account a profile land forms)
 The second stage of police of static corrections
 Automatic static corrections by the upper key horizons
 Audit CMP stack.
 The surfacecoordinated adjustment of amlitudes
 Package from three routines: BALANcalculation of average value of amplitudes; BALSOL calculation of balancing coefficients of amplitudes; BALAPPapplication of the counted coefficients;
 Audit CMP stack.
 surfacecoordinated, minimumphase deconvolution
 Package from two programs: SCAUTO calculation of the is surfacecoordinated mean functions of autocorrelation;; SCDECON application of the is surfacematched operative of the screen to seismic traces. For operation of programs two time windows were set;; ; in the maiden window (501600) spacing of prediction GAP=8 msec., white level of noise a window 10%, in the second window (17003500) spacing of prediction GAP=8 msec. White level of noise of 5%
 bandpass filter 8  14 –110 120
 Audit CMP stack.
 The second stage of interactive kinematic correction
 The third stage of static corrections
 Automatic static corrections on all key horizons
 Audit CMP stack.
 Interactive edition of a fundamental data after deconvolution
 Displacement elimination (DMO)
 Choice of the partitioning highspeed law for performance of routine of subtraction of multiple waves.
 Subtraction of multiple and particulatefold waveshindrances (ZMULT)
 Audit CMP stack.
 The third stage of interactive kinematic corrections
 The fourth stage of static corrections
 Automatic police of static corrections on all key horizons
 Audit CMP stack.
 The fifth stage of automatic police of residual static corrections TRIMST
 Automatic calculation and application of static corrections on hodographs CMP
 Definitive summation taking into account TRIMST
 Definitive norming amplitues to level 2000 with tuning up in a wide window, converting of cutaways in format SEGY and archiving with assignment of labels.
2.5 Treating of time sections
On definitive cutaways CMP for the purpose of dilating of a frequency spectrum of a cue, meliorating of the attitude a cuehindrance, for specification of position of time boundaries special routines have been executed. Treatings:
 Increase of a proportion a cuehindrance (FXDEC) (on the sum definitive), normalization of amplitudes to level 2000 with tuning up in a wide window, converting of cutaways to format SEGY and archiving.
 Migration of time sections (MIGRATX), amplitudes normalization to level 2000 with tuning up in a wide window, converting of cutaways to format SEGY and archiving.
2.6 Calculation AVOattributes
 Calculation AVOattributes
With seismograms ОГТ after subtraction of multiple and particulatefold waves of clutters (ZMULT) calculation AVO attributes.
2.7 Features of the method of application of separate stages of treating
Input of the seismic data. At a stage of input of the seismic data for input of profiles of 19811982, 19851986 g., 19871988, 19891990, 19901992, system XSTAR (produced "JointStock Company development 'Tomsk geophysical trust'"). For input of profiles of 19981999 and 19992000 SPSfiles were used. In the produced system were carried out:
 Input of the topographic data: a land forms, coordinates of sources and recipients, (files of format SRT), tables formings for input to system FOCUS;
 In processing complex FOCUS version 5.3, at building of tables of geometry detector arrays were described. As a result at this stage of the specification statement of geometry and input of a seismic stuff seismograms in format FOCUS with the pocketed geometry have been received. Further by means of program DATUM automatic calculation of aprioristic static allowances for to a ground of a land forms, depths of holes, zero offset arrival times on a datum line of 0 m. was executed.
Observation system check was executed by two means:
 • Interactive calculation and the analysis of profiles of attributes of observation system: the profile of frequency rate, a layout of sources and recipients;
 • Automatic calculation of a theoretical timedistance curve of primary arrivals (taking into account an electrode geometry and aprioristic static corrections) and its laying on real seismograms in the course of their viewing on the shield. In places of abnormal straddling of idealised and real hodographs the additional analysis of all source data and in need of their police was carried out. The produced operation has been executed on all bulk and has provided 100% conformity check between the described observation system and a seismic stuff.
Repressing of regular clutters on seismograms.
On the produced stuff various phylums of clutters dominate some:
1. Anomalistic peak pressure bumps. For their repressing programs of automatic edition with the task of indispensable proportions of mean and maximum voltages in the set spacings of time windows were used (TFCLEAN, REMSPK).
2. Surface, sound and mediumrate waveshindrances. The produced phylum meets everywhere. For this clutter characteristicly: intensity of voltage which one many times over exceeds intensity of back waves, unevenness of the form of a cue. The clutter spectrum occupies a frequency range of 814 Hz and is a little bridged with a spectrum of a beneficial cue. Surface waves were loosened after application of strip filtering of 814110120 Hz and programsLFAF. All these routines together with restoration of voltages have been used in one task (a complex of programs LIFT), ), use of a complex of programs is demonstrated in drawing 2.4.
3. Multiple and particulatefold waves. The produced clutters at sufficient frequency rate are considerably loosened by summation on ОГТ. But for an appraisal of kinematic arguments of gentle reflexes in a Cretaceous and Paleozoic part of a cutaway and increase of a proportion a signal/hindrance on high frequencies multiple waves are necessary for putting away. Routine ZMULT, working in FK and grounded on subtraction of energy of multiple waves at the introducing of spread corrections, hodographs of usable reflexions leading to a reflattening has been for this purpose applied. Application of the produced routine allows to make singling of horizons more confidently.
In drawings 2.5, 2.6, 2.7, 2.8 highspeed spectrums, summary seismograms before subtraction of multiple waveshindrances, in drawing 2.9  pieces of a time section before subtraction of multiple waves are demonstrated.
Adjustment filtering.At the produced stage reduction a seismogram and elimination of influencing of ground conditions the increase problem dared at dynamics of a wave field. The speed key of three routines was for this purpose executed:
The is surfacecoordinated trimming of voltages (a package of three programs BALAN, BALSOL, BALAPP). The produced routine was applied after attenuation of surface and mediumrate waveshindrances.
Is surfacecoordinated, is minimumphase, predicting deconvolution SCDECON in two time windows with tuning up of the operative of the screen on spacings of target horizons 501600 msec. And 17003500 msec. The prediction spacing is chosen equal 8 msec., white level of noise of 5%. Calculation of the operative of inverted filter SCAUTO was led taking into account averaging on Shot, software and on OFFSET.
bandpass filtering 814110120
The example of operation of the program of the is surfacematched trimming of voltages is demonstrated on fig. 2.10. The appraisal of a peak spectrum after adjustment filtering (is surfacematched is minimumphase predicting deconvolution) is demonstrated on fig. 2.11. It is visible that as a result it was possible to ream a seismogram spectrum essentially.
Fig. 2.6. Summary seismogram ОГТ, pieces of a time section with different highspeed curves and a velocity distribution after subtraction of multiple waveshindrances
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Fig. 2.8. Summary seismogram ОГТ, pieces of a time section with different highspeed curves and a velocity distribution after subtraction of multiple waveshindrances
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