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Input of the seismic data

Input of the seismic data and the description of geometry of observations

According to the geological assignment processing of seismic materials is spent in the full dynamic gamut (format R4), in a wide frequency band (8-120 Hz) with restoration of amplitudes. A processing time interval 0-4000ms, a step of digitization 1 ms.
There was a task in view, to gain effect with the qualitative relation a signal/hindrance in a wide frequency band and to provide inconvertible correlation of reflexions cretaceous and Jurassic slit parts.
In the beginning of processing of the area testing of key parametres of procedures of processing for the purpose of a select of their optimum values has been yielded. Parametres of restoration of the amplitudes, is superficial-co-ordinated deconvolution on seismogrammes, a band-pass filtration at various stages of processing, procedure of impairment of the regular noises, procedures of migration of a temporary slit were exposed to testing. Testing was spent for the materials registered on different seismic stations and different field batches, quality and which geological situation were an average for all area, and was carried out by search of parametres in a restricted gamut with an estimate of quality of effect. The chosen parametres have been fixed for all material. In the course of processing after each stage comparison of the gained effects with previous was carried out and on the basis of the relative measure of quality the solution on transition to a following stage of processing or recurring flowing with other parametres was made. Thus changes of parametres should not lead to waist of a strip of spatial and temporary frequencies and to change of the shape of the useful signal. The visual analysis of effects was supplemented with comparison of the quantitative parametres calculated by an identical fashion: the gain-frequency spectral characteristics of a signal and noises.

The performance of initial materialsв

The numeral seismic material for reprocessing was is taken in format SEGY, archiving in complex ARCOPY from field carriers.

Systems of observations on materials passers, direct, central, quantity of channels from 48 to 120, Мin distance from 0 to 600 metres, a move distance from 2400 to 3420 metres.

Examples of quality of a primary material of different years and their distributions of modes of frequency can be seen on fig. 2.1 and fig. 2.2

Initial seismogramme

a) Initial seismogramme and                                 b) Initial seismogramme and
frequency spectrum by line 990208              frequency spectrum by line 991709       

Fig. 2.1. An example of quality of a field seismic material.

An example of quality of a field seismic material

a) Initial seismogramme and                                 b) Initial seismogramme and
frequency spectrum by line 850523               frequency spectrum by line 870724       
Fig. 2.2. An example of quality of a field seismic material.

 

 

Control of system of observation

Control of system of observation