The first tool is a frequencywavenumber fk filter, a twodimensional filter. Pdf processing seismic data with open source software. I, crosscorrelation optional for vibration data, chap. A free powerpoint ppt presentation displayed as a flash slide show on id. An fk procedure of eliminating guided wave energy from shallow marine seismic data. The computational analysis of recorded data to create a subsurface image and estimate the distribution of properties is called data processing. One method of supplying a partially sorted array to the sorting algorithm is to use the sorted 2d data box of the previous time sample and replace only the new locations. The technique requires plotting points and eliminating interference. It is possible to produce twodimensional fourier transforms of twodimensional data sets, such as rectangular aeromagnetic and gravity maps. By contrast, this course uses cartoons and real data examples to provide an intuitive understanding of the seismic processing procedures.
In one dimension frequency filter we usually apply the following. Pgs offers a complete set of deghosting solutions comprising both acquisition based and processing based techniques or a combination of both. Therefore the fk transform may be described as decomposing the input data into a series of straight lines which map to straight lines in the fk space, hence a range of dips in time can be identified in fk and suppressed by muting. Application to a legacy mississippi lime survey sumit verma, shiguang guo, thang ha, and kurt j. Adaptive groundroll filtering david le meur cggveritas, nigel benjamin cggveritas, rupert cole petroleum development oman and mohammed al harthy petroleum development oman summary the attenuation of surface waves while maintaining a friendly preservation of the body waves is a difficult goal to achieve in land data processing. Reflection seismic geol463 method principles data acquisition processing data visualization interpretation linkage with other geophysical methods reading. This text provides a complete introduction to geophysical data processing. Seismic reflection investigation of c1 to f1 sector of the superconducting super. Highly aliased groundroll suppression using a 3d multiwindow. Geostatistics allows filtering seismic noise and artifacts without modifying the signal. Seismic processing and velocity assessments in the oil and gas resource potential of the 1002 area, arctic national wild life refuge anwr, alaska 64 3. Seismic data interpolation and denoising in the frequency. May 30, 2016 extended seismic data processing lec25, fk filtering 1. Two dimensional filtering of seismic data sudhir jain embree, burg and backus 1963 introduced the concept of twodimensional filtering to seismic processing.
Low temporal frequencies and high spatial slopes are also present. Where sgf is the ghostfree source signature, gs is the source ghost, gr is the receiver ghost and r is the instrument filter. Indeed they represent one of the main obstacles to the development of timelapse. Extended seismic data processing lec25, fk filtering 1. This unwanted signal were generated by various sources and therefore had their own noise characteristic. A seismic interpretation study should access the following data sets 2d or 3d seismic data cube.
Marfurt abstract while modern recording capacity facilitates dense seismic acquisition, many, if not most, legacy 3d land surveys are spatially aliased with respect to groundroll. Pdf comparison of fk and svd filtering in the processing. The quality of seismic volumes is critical in building reliable reservoir models. Pdf application of fk filtering for coherent noise. Seismic data processing geos 469569 spring 2006 geos 469569 is a mix of digital filtering theory and practical applications of digital techniques to assemble and enhance images of subsurface geology. Geol463 seismic method the only method giving complete picture of the. Applicationspecific seismic data conditioning and processing for confident imaging. Practical aspects of 3d coherent noise filtering using fkxky or wavelet transform filters p. Fk filter for the suppression of non desired waves. Lets take the fk filter as an example you transform your data into the fk domain and pick a polygon of data youd like to keep. Seismic inverse q filtering is a data processing technology for enhancing the resolution of seismic images. Ppt seismic data processing powerpoint presentation. Digital filtering theory applies to virtually any sampled information in time e.
Seismic data processing examples in the high plains oil plays echo processing makes a difference. An fk procedure of eliminating guided wave energy from. Seismic data processing with seismic unx, forel, benz, and pennington geophysical image processing with seismic unix, stockwell this efforts focus. Seismic data processing the computational analysis of recorded data to create a subsurface image and estimate the distribution of properties is called data processing. Dupont1 1 cgg,paris,france 2 ifp, paris, france summary source generated surface waves are a longstanding issue in land seismic data processing. These tipps from my experience will make it easier for you. These artifacts can be eliminated easily using a fk filter, which is described below. Extended seismic data processing lec25, fk filtering. An fk filter may however be detrimental to the primary wavefield for instance an 8hz cut is common and the contractor should state clearly what filter is being applied. Computer processing of vertical seismic profile data.
Young work completed under doe st485d saiidia national laboratories received sponsored by doe aug 1 6 19% osti to support the signal processing and data visualization needs of ctbt related projects at snl, a matlab based gui was developed. Custom program to load headers agc, decon, shot record velocity filter, mute, cdpgather velocity analysis a long script residual statics stack compare with previous results. Get seismic reflection processing pdf file for free from our online library pdf file. Deghosting and designature removing the seismic ghost. The fk response when applied it on 2d seismic data from. Simple being free of charge is not sufficientsee gratis versus libre. Well data required for interpretation are wireline logs gamma ray logs, resistivity logs, porosity log, sonic logs, density logs and neutron logs or equivalent rock property model, check shot data.
This book treats the processing of a subset of seismic data, those in digital forms. Seismic data interpolation and denoising in the frequencywavenumber domain mostafa naghizadeh y abstract i introduce a uni ed approach for denoising and interpolation of seismic data in the frequencywavenumber fk domain. Seismic data are often polluted by artifacts which have strong impact on subsequent processing or interpretation. The main emphasis of this large format book is on the practical application of seismic data processing methods. Seismic processing 7 proven tipps to make you a better processor. We applied fk filter with two different cutting techniques in four different processing flows to show its effect on seismic data. In the vector scheme, a column vector v is built by the rows of matrix i as shown in eqs. This basic sequence now is described to gain an overall understanding of each step. In this paper showing the heavy effective of fk filter on seismic data in razzak oil field when applied it, and display the result obtained. Such things as frequency content, gain, trace spacing, and type of display are all up for grabs see displaying seismic data. Deconvolution can also be performed on other types of data, such as gravity, magnetic or well log data. The use of seismic reflection to study earth subsurface is commonly troubled by the presence of the coherent noise in the seismic data. Wiener filter method can effectively remove random noises. Seismic data processing involves the compilation, organization, and conversion of wave signals into a visual map of the areas below the surface of the earth.
Vertical seismic profile vsp surveying is a vital tool in subsurface imaging and reservoir characterization. Seismic data random noise attenuation using dbm filtering. Fourier transform is the traditional method in signal analysis. Two statistical averages used to filter digital images and seismic data are the mean and the median claerbout, 1985. Three passes of analyses were performed and the picks checked by origin energy. Reading data in su format and converting it to rsf format.
A new nonlinear filter for waveequation extrapolationbased multiple suppression is designed in the fk domain. The mute function is implemented in the attached filter. A new denosing method in seismic data processing based on. Once production processing commenced the focus was on accurate velocity estimation. Cmp processing greatly enhances the signal to noise ratio and allows coherent reflections to be visible. Processing in the high plains processing experience processing. Introduction to the processing of seismic reflection data within reflexw in the following the complete processing of seismic reflection data is described including import of the seismic data chap. Pdf comparison of fk and svd filtering in the processing of. Comparison of fk and svd filtering in the processing of a land seismic data conference paper pdf available august 2015 with 1,358 reads how we measure reads. Fk filter after editing and mute of trace amplitudes, commonly in seismic processing flow chart, it recommends some kind of filtering.
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. Fx linear prediction filtering of seismic images mark p. It is found that the fx filter, when applied to noisefree synthetics, produces little or no attenuation of continuous layers, but does laterally smear sharp discontinuities. The curved event shown in green maps to a range of dips in fk. Buy seismic data processing investigations in geophysics, vol 2 on free shipping on qualified orders.
Inputoutput discgath reads anysort segy file and outputs traces in cdpsort discgathm reads multiple anysort segy files and outputs traces in cdpsort discread reads segy or claritas disc files. There are three primary steps in processing seismic data deconvolution, stacking, and migration, in their usual order of application. Here is the access download page of seismic reflection processing pdf, click this link to download or read online. The technique allows geophysicists to infer critical information that cannot be obtained otherwise. Thornton, peter morton, bj hulsey, andrew hill, and phil rawlins, microseismic inc.
Borehole seismic data processing and interpretation. Seismic data random noise attenuation using dbm filtering boll. Todays subjects definition of fk domain filtering in the fkx domain 3. Advanced seismic data processing and interpretation.
Course participants will receive a course book that will contain the contents of all overheads, with the exception of examples shown from the oz yilmaz classic seismic processing text. All processing was undertaken at fugro seismic imagings office in perth, western australia. Seismic processing 7 tipps to make you a better processor. Since the introduction of digital recording, a routine sequence in seismic data processing has evolved. In this exercise, we will process the 2d nankai dataset using the following seismic processing work ow. Practical aspects of 3d coherent noise filtering using f. Well data are gotten from rock samples and measurements at depth from a wellbore. Tdob08 2008 processing seismic data processing report september 2008 page 3 line name sp range cdp range km line name sp range cdp range km tdob08001 1667 1001 1 1572 16.
Summary we introduce an adaptive fk filter to improve the signal to noise ratio of passive seismic data. It provides students and practising exploration geologists and geophysicists with uptodate information on computer systems, data processing, time series analysis, seismic data processing, migration and inversion theory and practice. In seismic data processing we generally assume that the acquired seismic data is a minimum phase and that after. Geophysics research group, university of port harcourt, nigeria. Introduction to the processing of seismic reflection data. Our goal is to give you the experience and tools to continue exploring the concepts of seismic data processing. Filtering of seismic data the interpretation of seismic data is made purely on the basis of what is observed in the final processed section.
Read online now seismic reflection processing ebook pdf at our library. This study investigates the design and use of 3d fk filters operating on the poststack data volume. Image processing techniques can be used for filtering certain spatial wavelengths in the data or for passing structures with certain geographical. Seismic data processing, 1987 and seismic data analysis, 2001. The first filter used was fk filter, which is a two dimensional filter defined in the frequency domain obtained by double fourier transform. Notice that free and opensource requires that the source code is available. A primary aim of this book is to explain the process of inverse modelling. Upadhyay and others published seismic reflection processing find, read and cite all the research you need on researchgate. An fk procedure of modeling and removing guided wave energy from seismic data is discussed in this paper.
The method requires a controlled seismic source of energy, such as dynamite or tovex blast, a specialized air gun or a seismic vibrator, commonly known by the trademark name vibroseis. Schieck abstract seismic sections or slices resulting from the processing of 3d data can often be enhanced by the application of various filters. The input window is multiplied by a filter which is a function of both frequency and wavenumber. It is thus understandable that considerable time and effort is expended in any processing project on the final parameters of seismic display so as to satisfy the individual tastes of the interpreter. Seismic data processing investigations in geophysics, vol 2. Imaging the subsurface is almost exactly like standing beside a rugged cliff, clapping your hands, and trying to work out the shape of the cliff face from the echoes that you. Lindseth and one of the two books by ozdogan yilmaz. Highly aliased groundroll suppression using a 3d multiwindow kl filter. The reader interested in freeware just free of charge software is referred to the list of freeware geophysics software. Fir filters chapter home college of engineering and. Seismic data acquisition and analysis in the petroleum industry is a multibillion dollar activity. Median filters are more robust because extraneous data. Imaging the subsurface is almost exactly like standing beside a rugged cliff, clapping your hands, and trying to work out the shape of the cliff face from the echoes that you and. This book describes the theory and practice of seismic imaging, with an emphasis on migration of seismic data in exploration seismology.
Reflection seismology or seismic reflection is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the earths subsurface from reflected seismic waves. Seismic data consists of a series of recorded wiggle traces that describe a set of echoes from interfaces between rock layers in the subsurface that have different rock properties. Our objective is to introduce you to the fundamentals of seismic data processing with a learnbydoing approach. It is written at the level where it can be understood by physical scientists who have some familiarity with the principles of wave propagation, fourier transforms, and numerical analysis. Elimination of seismic ghost reflections by means of a linear filter. It is also common to run a set of filter trials on gain corrected shot records to determine the approximate bandwidth of the data prior to any further processing. The realization of the new filter in the fk domain is an extension of the conventional fk dip filter. Deconvolution, or inverse filtering, can improve seismic data that were adversely affected by filtering, or convolution that occurs naturally as seismic energy is filtered by the earth. This is useful for inspecting the spatial frequencies in the north and east directions. However, this did not become widespread because although long space operators are successful in attenuating undesirable components of data, they also. This is one reason why zerophase wavelets are usually output in seismic data processing. Each wiggle trace is the record, in time, of when sound from each source.
Improving signaltonoise ratio of passsive seismic data with an adaptive fk filter chuntao liang, mike p. Seismic data quality control and filtering geovariances. Data conditioning encompasses a wide range of technologies designed to address numerous challenges in the processing sequencefrom data calibration and regularization. The fundamental parameter is the slope of the velocity which is desired to be removed or kept. Seismic unix su processing data load, header dumps, and initial qc plots data observations. From the field to the final volume, seismic data goes through many processes and workflows. It employs a wave propagation reversal procedure that compensates for energy absorption and corrects wavelet distortion due to velocity dispersion. By compensating for amplitude attenuation, seismic data can provide true relativeamplitude information for amplitude inversion and. Improving signaltonoise ratio of passsive seismic data with. Additionally, a group of n geophones increases the signaltonoise ratio by a factor of nla times that recorded on a single geophone. The seismic unix package supplies the sudipfilt dipslope filter which uses the fk spectrum to separate out events with different apparent velocities investigate the parameters of sudipfilt using. Seismic interpretation an overview sciencedirect topics. We do this with seismic unx su, a free software package maintained and distributed by the center for wave phenomena cwp at the colorado school of mines csm.
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