In g-Platform we can to do the phase conversion for Vibroseis data. To do that the user should have the sweep information.
Module name Min Phase Conversion
Minimum Phase Conversion for Vibroseis Data
MINIMUM PHASE CONVERSION
For that task we are able to use different modules like Create sweep, Min Phase Conversion and others. The input seismic data is vibro, so according to the theory the signal is zero-phase and real recorded traces is some kind of mixed phase data. But min.spike deconvolution requires a min-phase data as input. Therefore, we need to transform a seismic data set from zero-phase to min-phase type by using the following steps: create a model sweep wavelet (autocorrelation) which is a representation of the original impulse and perform minimum phase conversion of the input seismic data.
1. Read seismic traces. In this module use load to RAM option, because we are not going to put Min Phase Conversion inside the Seismic loop, so we have to upload traces to RAM. Notice, that we do it only in this flow just to see how we can work with seismic data in g-Navigator. Use seismic data set from the previous step 0040_SCAC.
2. Create sweep. Create a model sweep wavelet. Definition for a sweep you can find in the field documentation. Define parameters for the module:
Execute a module Create sweep, open a vista view and check a sweep response:
3. Correlation. Add the next module Correlation for creation a auto correlation function of the sweep response. Define the input data and parameters:
There are two option for autocorrelation: use option Autocorrelation or use two sweeps and perform correlation. Define parameters of Correlation module:
Execute the module and you get auto correlation function of the sweep response:
4. Min.phase conversion. The next module is Min Phase Conversion performs creation a minimum phase operator from the input model (in our case it is a sweep AFC) and apply this operator to the input seismic data set. Define its parameters and execute the module:
Execute the module. Input seismic data was converted to a minimum phase type, so we can go the the min phase spike deconvolution process