Robinson pointed out that the algorithm of inverse q filtering is similar to seismic deconvolution. In this paper we present a stable approach to inverse qfiltering, based on the theory of wavefield downward continuation. It employs a wave propagation reversal procedure that compensates for energy. Generalized stable inverse q filtering sciencedirect. The degree of attenuation can be approximated from q measured in seismic data, and the q can be used to design an. Inverse q filtering by fourier transform geophysics. Seismic migration with inverse q filtering, geophysical. Roy ongc, geophysical services, chennai summary the effect of dispersion and attenuation on land seismic data can be removed by applying inverse q filtering thus. It employs a wave propagation reversal procedure that.
Seismic inverse q filtering this book is dedicated to my wife guoling, and my two children brian and claire. Q filtering compensates the data for the frequency dependant attenuation. This can make reservoir evaluation based on the deeper seismic image difficult. So we need to improve the resolution of seismic data. Multicomponent seismic exploration technology, combining reflected pp and converted pswaves, is an effective tool for solving complicated oil and gas exploration. And then constant q inverse filtering was applied in each layer. The resultant seismic section, after stabilized inverse q filtering wang, 2002.
Postmigration inverse q filtering to enhance amplitude. Seismic wave dispersion effects and inverse qfilter phase compensation. Although some attention has been paid to the idea that seismic migration is equivalent to a type of. Estimation of q factors from reflection seismic data for a. Abstract our primary investigative tool for understanding the subsurface prospectivity is seismic data, where energy reflected from different seismic horizons can reveal the physical properties. It employs a wave propagation reversal procedure that compensates for energy absorption and corrects wavelet distortion due to velocity dispersion. Based on the expression of amplitude attenuation and phase velocity dispersion proposed by futterman, and considering the well.
Applying inverse q filtering to surface seismic data may minimize the effect of dispersion and attenuation and hence. Unfortunately, there is no reliable way to estimate the attenuation factor q directly from seismic data. Seismic inverse q filtering yanghua wang download here seismic inverse q filtering is a data processing technology for enhancing the resolution of seismic images. Highresolution seismic processing by gabor deconvolution. Inverse q filter for seismic resolution enhancement. Seismic inverseq filtering can be regarded as a reversal procedure of wave propagation. Firstly, the forward phase and amplitude propagator. Seismic wave dispersion effects and inverse q filter.
Seismic inverse q filtering using malvar window based time. Improving prestack seismic data resolution based on. Seismic inverse q filtering is a data processing technology for enhancing the resolution of seismic images. Seismic inverse q filtering can be regarded as a reversal procedure of wave propagation. Use qrtm to image beneath gas hydrates in alaminos. Q estimation from reflection seismic data for hydrocarbon. An inverse qfilter algorithm based on stable wavefield. Inverse q filtering in 3d pp and psv seismic data a. Estimation of q and inverse q filtering for prestack. A principal limitation on seismic resolution is the earth attenuation, or qeffect, including the energy dissipation of highfrequency wave components and the velocity dispersion that. The interval q values obtained from such a q analysis procedure are listed as follows.
Q tomography builds a model of the anomaly using prestack amplitudes. Different methods to apply forward and inverse q filtering can be applied. Robinson pointed out that the algorithm of inverseq filtering is similar to seismic. Zhang gulan 1,2, he zhenhua 1, wang ximing 2, zhang jianjun 2, zhang yanbin 2, li fei 2. By compensating for amplitude attenuation, seismic data can provide true relativeamplitude information for amplitude inversion and. The precision of seismic reflection data does not fulfil to explore private and complex structure oilgas pools. Although it restores the balance of frequencies, it can also introduce phase rotation to the data, no q after. Application of generalized stable inverse q filtering to real seismic data.
In principle it can also be used as viewer for seismic traveltime data from. Seismic migration with inverse q filtering wang 2004. It employs a wave propagation reversal procedure that compensates for. Seismic attenuation compensation by bayesian inversion. Seismic data analysis oz yilmaz chapter 10 structural. Guo and wang, 2004, is plotted in figure 5, which shows true amplitude variation of the seismic reflection. In seismic wave propagation, both the amplitude attenuation and the phase distortion are the exponential functions of the frequency and the travelling time. A new inverse q filtering method based on the timefrequency analysis using malvar wavelet decomposition is proposed. Application of inverse q filtering to land seismic data to. Seismic inverse qfiltering employs a wave propagation reversal procedure that compensates for energy absorption and corrects wavelet distortion due to velocity dispersion. The stable approach of inverse q filtering based on wavefield continuation theory can simultaneously perform amplitude compensation and phase. Application of inverse q filtering to land seismic data to improve signal where there is no vsp data control r.
Compensating for attenuation by inverse q filtering. Stabilized inverse q filtering is a data processing technology for enhancing the resolution of reflection seismology images where the stability of the method used is considered. Inverse qfilter for seismic resolution enhancement. At best, inverse q filtering can be applied to post or prestack data appendix b. The earth qfilter,with frequencydependent amplitude attenuation and velocity dispersion,can distort seismic wavelet and reduce the seismic resolution.
Seismic inverse q filtering by yanghua wang overdrive. Seismic data analysis oz yilmaz chapter 10 structural inversion 10. Pdf inverse qfilter for seismic resolution enhancement. Reflections on the deconvolution of land seismic data. Q psdm can then use this model to compensate, recovering bandwidth, allowing meaningful avo studies to be. Fx linear prediction filtering of seismic images mark p.
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