Seismic bandwidth processing

[sankhajit_saha]

hi
A very happy new year to all of u
well i m a geophysicist.
I would like to know about SEISMIC BANDWIDTH PROCESSING.
I have read few papers of extending seismic bandwidth using CWT (Continuous Wavelet Transform ) for thin bed analysis particularly or at greater depth where conventional seismic resolution is very poor.
Guys any idea or any kind of software or programme which i can look for after all its----------- Lamda/8

[RockyCentero]

Hi saha,

I would recommend the following:
1- Spectral blueing if you have a minimum of 5-7 wells with AI logs, soft: OpendTect
2- Spectral decomposition, CWT one method but would recommend FFT using Morlet-Gabor wavelet, soft: ---
3- seismic inversion, best would be to use stochastic inversion if you have enough wells, min of 4-5 wells, soft: Jason, OpendTect
Cheers

[sankhajit_saha]

Thank you Rocky for ur quick reply
well this is developed and a bit old field. so there is no sonic or density logs in that particular reservoir. so it is a bit difficult to run inversion in that target. can it be possible during seismic processing by creating HARMONICS or SUB HURMONICS of wavet........
waiting for ur reply......

[RockyCentero]

If there's no well data to use, then you could always go for the spectral whitening using the S/M/T/ ------- soft but be carefull with the level of noise.
Yet, you could go with some inversion to do wavelet removal by generating relative acoustic impedance cube since it doesn't require any well data, use jason or S/T/R/T/A from HRS platform
Again for any spectral decomp, the best is the one from S/M/T/ -------.
better to refer to Lambda/4 instead of lambda/8 which use to vary depends on your reservoir characteristics.
Start with these easy solutions before going to more advanced stuff

[sankhajit_saha]

thank u Rockey
Let me do the steps u quoted....
but for just query for say 3 series of sand having 7-10 mt thickness each at Eocene level (4500 mt my case ) can be interpreted ?

[RockyCentero]

That's a quite challenging issue and not an easy one to answer without having looked at your seismic...
You may have to add on top your list a forward seismic modeling to do feasibility study and tuning analysis, VSP if available would help a lot for that.
Ultimately you may have to go back to the tapes and reprocess the whole seismic data