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Parameters mining

Field CMP seismic surveys were carried out by W. technology

  • The method of excitation - Bang (charge weight - 0.5kg) in single wells of 12-15m depth
  • Surveillance System - a centrally symmetric, 'the cross'
  • Number of active channels - 960
  • The number of receiving lines - 10
  • Number of channels on the line - 96
  • bean size 25x25 m
  • nominal multiplicity - 30
  • Step between the lines of the reception - 300 m
  • Pitch Station - 50 m
  • The step between the lines of excitation - 400 m
  • Step between Shot - 50 m
  • Overlapping bands (units) - 5 lines of reception
  • Maximum distance - 3189m
  • The maximum distance on X - 2400
  • Maximum distance in Y - 2100m
  • Recording time - 4s
  • Step rate - 1 ms

The method of processing

input seismic data and the geometry of observation

Map of multiplicity

Map of multiplicity

Map of the distribution of near-delete

Map of the distribution of near-delete

Map of the distribution of further removal

Map of the distribution of further removal

Map of exceedances

Map of exceedances

Control monitoring system

Control monitoring system

a priori calculation of static corrections

To control and accounting of the influence of Low-velocity zone on the value of a priori static correction data were processed LOG

Map of the velocity in the Low-velocity zone

Map of the velocity in the Low-velocity zone

Map of the values ​​of static corrections for relief

Map of the values ​​of static corrections for relief

ICC were performed on a rare grid square on mining, and therefore more accurate determination of static corrections was used for the static calculation apparatus refraction.

Map of static correctionsREFRACTION

Map of static correctionsREFRACTION

REFRACTION_TOMO

static correction method of obtaining tomographic inversion to calculate the short-period and nedouchtennoy dlinoperiodnoy static

REFRACTION_TOMO assesses the near-surface velocity model and calculates the static correction via scan times of first arrivals came without building seismic wave radiation.

inverse transform travel times, carried out in this module consists of the following:

  1. The data for the inverse transform selected from the range specified and ordered deletions as necessary.
  2. functionVX,R for 3 -D data measured at chosen values ​​of the first arrivals, using the method of imaging.
  3. Calculate the local velocity function/depth of which is made near-surface model.
  4. Using this model, calculated as long-period statics.
  5. Through surface-compatible expansion of the residual travel times estimated short-period statics.

Map of static correctionsREFRACTION_TOMO area

Map of static correctionsREFRACTION_TOMO area

Analysis of the wave field and the choice of the graph preprocessing seismograms

Example of vertical velocity analysis

Example of vertical velocity analysis

Horizontal velocity analysis, time horizon, high-speed range and velocity curve of single reflection

Horizontal velocity analysis, time horizon, high-speed range and velocity curve of single reflection

Fragment of a priori CDP time section

Fragment of a priori CDP time section.

 

Pre-processing of seismograms

After receiving the preliminary amounts and seismograms of the initial velocity analysis have been tested and used the following procedure:

• correction of the amplitudes for geometrical spreading (t3.);
• suppression of high-emission unit;
• selective filtering in the 'cone' of propagation of surface waves;
• Multi-channel version of seismograms median;
• bandpass filtering (in the range of 6-100Hz);
deconvolution compression.

Procedures for noise suppression Procedures for interference suppression. Before and after.

Deconvolution

before deconvolution after deconvolution
Fragments of the time section and the amplitude-frequency spectra

Fragment of time section after deconvolution of the CMP

Fragment of time section after deconvolution of the CMP

Next - Count processing ...