An alternative method for reversing the effects of q is to explicitly apply an inverse qfilter before deconvolution. The radon transform yields a better seismic image than the bandpass and. Inverse q filtering is an important seismic processing operation often used to correct for attenuation and dispersion effects and increase the. Evaluation of a number of qc attributes in arbitrary windows, as well as their derived combinations. It employs a wave propagation reversal procedure that compensates for energy absorption and corrects wavelet distortion due to velocity dispersion. Seismic inverse q filtering by yanghua wang seismic inverse q filtering by yanghua wang pdf, epub ebook d0wnl0ad seismic inverse q filtering is a data processing technology for enhancing the. The forward and inverse transforms are required, since some operations are computed on the frequencydomain signals, and the inverse transform is used to compute a discrete timedomain signal. It is implemented in a layered manner, assuming a layeredearth q model. The radon transform yields a better seismic image than the bandpass and inverse q filters, since it removes the noise and the multiples from the data quite efficiently. Inverse q filtering is an important seismic processing operation often used to correct for attenuation and dispersion effects and increase the resolution of reflection records. Why 3d seismic data are an asset for exploration and mine planning.
For each individual constant q layer, the seismic wavefield recorded at the surface is first extrapolated down to the top of the current layer and a. Compensating for attenuation by inverse q filtering. Velocity tomography of weakness zones in the kevitsa nicupge mine, northern finland. After inverse q filtering, seismic data will have improved quality with correct amplitudes and phases, which will result in better matching with the. Through the example of wellseismic calibration, we further illustrated that inverse qfilter phase compensation can effectively eliminate seismic wave velocity dispersion, enhance wellseismic. Jan 26, 2009 seismic inverse q filtering is a data processing technology for enhancing the resolution of seismic images.
The effectiveness of stable inverse q filtering to land seismic. 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. The process described here is zerophase frequency filtering, since it does not modify the phase spectrum of the input trace, but merely bandlimits its amplitude spectrum. This is basically a generalization of the question deriving the inverse filter of image convolution kernel. Pdf seismic wave dispersion effects and inverse qfilter. Attenuation and dispersion can be quantified by seismic quality factor q. Unfortunately, there is no reliable way to estimate the attenuation factor q directly from seismic data. Cmp processing greatly enhances the signal to noise ratio. When a seismic waves or energy propagate through the earth, they are. Velocity estimation, velocity field building, and velocity uncertainty implications. Inverse q filter for seismic resolution enhancement seg library. Improving prestack seismic data resolution based on.
Summary of crewes software for q modelling and analysis. Starting with the application of the traditional timevariant spectral whitening, which might distort the. A source signature was modelled to pass through the various processing stage, the resulting output converted to zerophase and the operator applied to the seismic data. Promax software was used for seismic data processing and esti. Seismic migration with inverse q filtering, geophysical. The seismic events in the q filtered image look sharper, with a better lateral continuity than those in the former section and are reliable due to the trace by trace approach of the applied inverse q filter. Starting with the application of the traditional timevariant spectral whitening, which might distort the seismic amplitudes, one might use inverse q filtering, spectral decompositionbased methods and thinbed reflectivity inversion. Realtime land seismic qc and infield processing radexpro. This filter can be used to extend the natural period of a sensor. The degree of attenuation can be approximated from q measured in seismic data, and the q can be used to design an attenuation compensation scheme to correct the effects of energy absorption and phase dispersion caused referred to as q inverse filtering wang, 2002.
Pdsview software package for viewing oilfield graphics data files. Seismic inverse q filtering ebok wang yanghua wang. Although practical methods for inverse qfiltering have existed for many years e. Pdf estimation of q and inverse q filtering for prestack. It employs a wave propagation reversal procedure that compensates for energy absorption. In this paper we present a stable approach to inverse q filtering, based on the theory of wavefield downward continuation. Seismic inverse q filtering is a data processing technology for enhancing the. Seismic inverse q filtering yanghua wang by therese kibler. Seismic inverse qfiltering,, is a process targeted at inverting phase and amplitude distortions of the propagating and reflected acoustic waves. Q is the anelastic attenuation factor or the seismic quality factor, a measure of the. In this paper we present a stable approach to inverse qfiltering, based on the theory of wavefield downward continuation.
In real data processing, we often need to redo the. Conventional inverse qfiltering boosts ambient noise and degrades the sn ratio of the output section. A variablewindow gabor transform is used to generate 2d timefrequency spectrum. Nov 01, 2004 read seismic migration with inverse q filtering, geophysical research letters on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. An alternative method for reversing the effects of q is to explicitly apply an inverse q filter before deconvolution. This can then be applied to any trace as an inverse q filter. The degree of attenuation can be approximated from q measured in seismic data, and the q can be used to design an attenuation. Threedimensional sparse seismic deconvolution based on. Inverse q filtering is an important dataprocessing procedure broadly used for enhancing. By compensating for amplitude attenuation, seismic data can provide true relativeamplitude information for amplitude inversion and. Seismic inverse q filtering by yanghua wang overdrive. Seismic inverseq filtering can be regarded as a reversal procedure of wave propagation. Comparing three methods for inverse q filtering carlos a.
Q estimation from reflection seismic data for hydrocarbon. Frequencydomain filtering involves multiplying the amplitude spectrum of the input seismic trace by that of the filter operator. The phase spectrum of the inverse q filter usually is assumed to be minimumphase, which can be computed by taking the hilbert transform of the amplitude spectrum appendix b. Q is the anelastic attenuation factor or the seismic quality factor, a measure of the energy loss as the seismic wave moves. The seismic trace is the combination of both signal and noise, the signal wanted data is the representation of the geologic feature but the presence of noise shows it different from real. The author appears to be fond of using the gabor transform. Some seismic instantaneous bandwidth attribute applications. The averageq model estimated directly from reflection seismic data is reliable. Deriving the inverse filter of image convolution kernel. Inverse q filtering is a wave propagationreversal processing that removes these effects from recorded seismic data. The interpretation of seismic data is made purely on the basis of what is observed in the final processed section. It employs a wave propagation reversal procedure that compensates for energy.
Estimation of q factors from reflection seismic data for a. Apr 20, 20 seismic inverse q filtering yanghua wang. So we need to improve the resolution of seismic data. Application of inverse q filtering methods in the near. Extraction of wavelet from seismic using a well log to determine the phase. Hale, 1982, inverse q filtering has never become a standard element of the seismic processing flow. Seismic inverse q filtering by yanghua wang seismic inverse q filtering by yanghua wang pdf, epub ebook d0wnl0ad seismic inverse q filtering is a data processing technology for enhancing the resolution of seismic images. Inverse qfilter for seismic resolution enhancement spiral. The precision of seismic reflection data does not fulfil to explore private and complex structure oilgas pools. Bandpass filter, inverse q, and radon transform are applied to the migrated prestack data, over the time range of 06000 ms. Inverse attenuationfiltering mohamed haiba and igor b. Seismic imaging of subsurface geology training course. Q filter dug insight user manual downunder geosolutions.
The effects of anelastic attenuation are present in all seismic data and range from subtle to. Mar 14, 2009 in this paper, we present a method to estimate the swave q values from prestack converted wave gathers. Bibliography includes bibliographical references p. Reflections on the deconvolution of land seismic data. There are several methods used during processing to enhance the frequency content of the seismic data.
Ideally, the process of inverse q filtering improves the. Q filter dug insight 4 user manual dug insight user manual. It employs a wave propagation reversal procedure that compensates for energy absorption and corrects wavelet distortion due. In the forward q filter, each method is characterized by a particular accuracy and computational. Application of inverse q filtering to land seismic data to. When enabled, the q filter will be applied only below the sea floor, using the timereferencing corrections described in ganyuan. Pdf inverseq filtering is an important seismicprocessing operation often used to correct. Seismic inverse q filtering is a data processing technology for enhancing the resolution of reflection seismology images.
The q filter applies or removes corrections for dispersion and attenuation. Cmp processing greatly enhances the signal to noise ratio and allows coherent reflections to be visible. An inverse qfiltering procedure attempts to remove the qeffect to produce highresolution seismic data. Viewing software information help viewing system information help checking for updates help disabling automatic update.
Enhancing time resolution by stabilized inverse filter and. Through the use of conventional inverse q filtering algorithm can be applied to derive a stable and efficient inverse q filtering algorithm continuous medium, and through a stable and efficient data. Interactive common sourcecommon receivercmp attribute maps, cmp fold map, location map for. It is based on the inverse filter design by bob mcclure. Read seismic migration with inverse q filtering, geophysical research letters on deepdyve, the largest online rental service for scholarly research with thousands of academic.
A principal limitation on seismic resolution is the earth attenuation, or q effect, including the energy dissipation of highfrequency wave components and the. Reflections on the deconvolution of land seismic data cseg. Searched for inverse q filtering in all fields 1 results found d. In seismic wave propagation, both the amplitude attenuation and the phase distortion are the exponential functions of the frequency and the travelling time. Furthermore, we extend a stable and effective poststack inverse q filtering method to prestack data which uses wave field continuation along the ray path to compensate for attenuation in prestack common shot pp and pswaves. At best, inverse q filtering can be applied to post or prestack data appendix b. Comparing three methods for inverseq filtering carlos a. Opendtect, and the processing is performed with geoview software form.
By compensating for amplitude attenuation, seismic. Xia, proper timereferencing for prestack q estimation and compensation, eage. Robinson pointed out that the algorithm of inverseq filtering is similar to seismic deconvolution. Although practical methods for inverse q filtering have existed for many years e. Application of inverse q filtering to land seismic data to improve signal where there is no vsp data control r. A stable and efficient approach of inverse q filtering. Different methods to apply forward and inverse q filtering can be applied. Deriving the inverse kernel of a given 2d convolution kernel. The suite of tools, including omega platform and ocean software development framework plugins plugins for the petrel platform, is designed for anyone needing to handle seismic data for conditioning, processing, modeling, imaging, seismic interpretation, and inversion or avo modeling. An inverse qfilter neither suppresses nor amplifies the data components with high frequencies at late times. Seismic inverse q filtering is a data processing technology for enhancing the resolution of seismic images. An inverse qfilter algorithm based on stable wavefield. Based on the expression of amplitude attenuation and phase velocity dispersion proposed by futterman, and considering the wellseismic matching, we derived the expression of seismic wave.