multiples in seismic data

Determination of Multiples in Surface Seismic Data Using Zero Offset Vertical Seismic Profiling (ZVSP) Techniques The resultant traces, having had the multiples removed, can be processed conventionally … The kinematics of the primary … In the past few decades many filtering methods … Detailed Surface Multiple Prediction Using Split-spread Broadband Seismic Marine Data in a Complex Sea Floor Environment . 2015 ExxonMobil The Ideal Seismic Response Increase in Impedance Decrease in Impedance Able to resolve boundaries of beds a few meters thick 1 meter 43 ExxonMobil Seismic - Units 10’s of Meters Thick 10 m Predominantly Shale Predominantly Shale Predominantly Sand 44. The application 1 CGG - Compagnie Générale de Géophysique . Seismic interpretation in areas such as the one illustrated here can be severely jeopardized by the presence of short period multiples which are extremely difficult to identify. Abstract: Methods, systems, and computer-readable media for identifying multiples contamination in a stack are provided. Marine Processing - Part 9 | Demultiples This sequence of blog posts will build up into a complete description of a 2D marine processing sequence and how it is derived. Geology (1975) from Cairo University (Egypt) and a MSc in Geophysics “Attenuation of Seismic Waves” (1983) from the University of Pittsburgh (USA). We now examine the various types of multiples in recorded marine data in different domains — shot records, common-offset sections and CMP gathers. https://wiki.seg.org/index.php?title=Dictionary:Multiple&oldid=44533, Problems in Exploration Seismology & their Solutions, the Creative Commons Attribution-ShareAlike 3.0 Unported License (CC-BY-SA). Correlation with synthetics can also be used when well data are available, but even then the interpreter is rarely able to identify multiple events with certainty. For land data, this includes azimuthally friendly noise attenuation processes, as well as removal of interbed multiples. Accurate AVOAz analysis requires proper data processing of the input seismic in order to preserve the primary amplitude. We present a technique for identifying and attenuating multiple reflections in seismic data using non-linear filters i.e. The method also … Kind Code: A1 . Exploration Geophysics: Vol. In this study, we present a comparison of these three methods for attenuating free-surface multiples energy in short-offset 2D seismic data from Cendrawasih Bay. Multiple existences is still a major problem in seismic data processing since multiple energy A method exists for marine seismic data which removes all orders of free surface multiples and suppresses all orders of internal multiples while leaving primaries intact. INTRODUCTION - Methods based on a difference in spatial behavior of multiple Seismic … data because they generally lack the familiarperiodicity associated with marine data multiples. Initially, the data may be used to enhance a structural interpretation based on two-dimensional (2D) data, yielding new drilling locations. Multiples detected were short, long period and interbed multiples on all frequencies ranges of 0 – 90Hz but useful seismic frequency range was between 20Hz and 70Hz. A technical blog about seismic data processing (powered by GLOBE Claritas) Thursday, 23 January 2014. This labelling is derived during velocity analysis from the deviation of semblance peaks from those corresponding to the primary velocity function. Multiples in Marine Data Butler et al. and lastly, wave prediction and subtraction from seismic data [3]. In December 2014, SEG and Kuwait Oil Company (KOC) held a joint workshop to advance the understanding of seismic multiples, both as signal and noise, and to provide answers to the challenges posed by seismic multiples in processing and interpretation. Multiples from the bottom of a body of water and the air-water interface are common in marine seismic data, and are suppressed by seismic processing. This has ledto the misconception that multiplereflectionsare only a problem withmarinedata. … The application of these techniques to data from the Timor Sea is presented as a case study. This highly flexible solution can also be used on ocean bottom seismic and node data. Register to receive personalised research and resources by email, Identifying Multiples on Seismic Sections, Seismic Exploration Group School of Earth Sciences The University of Melbourne, /doi/pdf/10.1071/EG993359?needAccess=true. The discrete wavelet transform (DWT) is often preferred to the Fourier transform for characterizing digital images, because One of the most serious difficulties faced by geophysicists when interpreting seismic sections from areas like the Northwest Shelf of Australia is the problem of distinguishing multiples from primaries. In shallow water, the critical point of seismic analysis is the attenuation of seabed multiples. multilayer perceptron neural networks. Marine seismic data is generally acquired by towing source and receiver arrays through the water, periodically generating an acoustic pulse and recording the echoes reflected back from the sub-sea layering. Research Paper | Geophysics | Nigeria | Volume 6 Issue 10, October 2017. You can disable cookies at any time. Examples. The raw data displayed in Figure 4.a shows strong second and higher order water bottom multiples from the previous shot. Although very shallow seismic events are generally not important from an exploration interpretation perspective, the footprint amplitude striping may be problematic for 3D SRME. Conflicting dips can not always be resolved by associating one event with a multiple from higher in the section. Introduction In many areas of the world marine seismic data contains multiple reflections from water-bottom scatterers that are This segmentation of the data also allows us to select a range of periods of internal multiples that one wishes to construct because, in the context of the attenuation of internal multiples, it is important to avoid generating short-period internal multiples that may constructively average to form primaries at the seismic scale. A method for estimating internal multiples in seismic data. Abstract: Multiple reflections in seismic data are generally considered to be unwanted noise that often seriously impedes correct mapping of the subsurface geology in search of oil and gas reservoirs. Recent advances in methods for multiple reflection elimination have … Seismic wavefield data is recorded by seismic multi-component receivers, the data having measurements relating to pressure (p) and velocity (v, v, v) components of the wavefield. innovative seismic data solutions to the oil and gas industry. Short-period multiples attenuation is a difficult problem for shallow water marine seismic data processing. Usually long-path multiples have traveled more in the slower (shallower) part of the section than primaries with the same arrival time, so that they ordinarily show more normal moveout and can be attenuated by common-midpoint stacking.[1]. A colour overlay technique is proposed which labels events (both primaries and multiples) on the section by velocity. We also use partner advertising cookies to deliver targeted, geophysics-related advertising to you; these cookies are not added without your direct consent. Over the decades several demultiple techniques have come up in the industry. By closing this message, you are consenting to our use of cookies. Schematically, moveout and predictability are These unwanted features may actually be somebody else’s signal, such as converted waves in what we think of as “P-wave” data – but more commonly, these unwanted “noise” features provide little or no information about the subsurface, and are referred to as random noise and … data. This website uses cookies. Improving adaptive subtraction in seismic multiple attenuation Shoudong Huo1 and Yanghua Wang2 ABSTRACT In seismic multiple attenuation, once the multiple models have been built, the effectiveness of the processing depends 2015). Recommended articles lists articles that we recommend and is powered by our AI driven recommendation engine. of Houston, Houston, Texas 77204. We train a backpropagation neural network in order to recognize and remove these multiple reflections and thereby bring out the primary reflections underneath. Surface related multiple elimination uses the recorded data to predict multiples produced by the downward reflection at the sea-surface, without the need for any information on the subsurface. Later in the life of a field, seismic data may be revisited to answer questions about fine-scale reservoir architec-ture or fluid contacts, or may be compared with a later monitor survey to infer fluid … The suppression of multiples in seismic data processing can be achieved by several means of which filtering in the parabolic Radon Transform domain is the most common (Hampson, 1986). In addition to direct water bottom multiples and water layer peg legs, direct multiples from deeper horizons are also addressed. A neural network is trained with modeled data that are generated from well-log … Operating since 1998 from Hannover, Germany, effective cooperation with strategic partners leads to conduction of complex interdisciplinary projects from acquisition support over processing towards analysis and interpretation. Diego Gragnaniello 1 Caroline Chaux 2 Jean-Christophe Pesquet 1 Laurent Duval 3 Détails. These events must be eliminated from the recorded section in order to allow a better understanding of the geology of the area. Multiple removal can still be applied, but with a reduced potential for primary damage. The identification of the short-period multiples, such as the peg-leg multiples, is especially important in successfully interpreting the surface seismic data from the southern Gulf The peg-leg, or inter-bed multiples are those which have been reflected successfully from the top and base of thin reflectors on the way to or from the main reflecting horizon. We present a multidimensional multiple-attenuation method that does not require any subsurface information for either surface or internal multiples. Seismic Multiples: Ghosts of the seabed Ghost 1 Ghost 2. as a Data Processing Seismic Engineer in Kuwait, followed by a Testing Geophysicist role in Houston, before his current position. Our strength lies in our experienced team with over 20 years of experience directly in seismic data … 10.1190/1.3122408 Improving adaptive subtraction in seismic multiple attenuation Shoudong Huo1 and Yanghua Wang2 expanded multichannel matching 共EMCM兲 filter, masking the data ABSTRACT prior to subtraction and subtracting multiples according to their or- ders. A convex variational approach for multiple removal in seismic data . Water depth varies from 2700 m to 3200m in this survey area. The data for a multiple reflection generated between a and b will delineate the imaginary bed (a-b)' having a reflection time equal to that of the deeper actual reflecting bed, plus the difference in the reflection times of the two actual reflecting beds:EquationCompared with the rays reflected from bed b, the seismic rays corresponding to the multiple reflection travel over an additional … Imaging can be achieved with alimited frequencybandwidthasavailable fromseismic datawith a This method is based on the inverse scattering series and makes no assumptions about the subsurface earth model. multiples in the surface seismic data. Although considered as noise in the past, multiples are being increasingly seen as a tool for better illumination of the subsurface. Seismic data are usually contaminated with noise, which refers to any unwanted features in the data. Direct inversion using reflection data measured at one side of the target in 1D is possible for infinite bandwidth data, which is not available in measured seismic data. In addition to direct water bottom multiples and water layer peg legs, direct multiples from deeper horizons are also addressed. A. Pica 1 R. Sablon J. Deprey S. Le Roy 2 R. Soubaras M. Chambefort G. Henin V. Danielsen E. Dhelie J. Internal multiples were detected and attenuated using data-driven methodology of extended internal multiple prediction (XIMP). Identification and suppression of multiples in ocean bottom seismic data . The aim is to separate the multiple wavefield from the primary wavefield and suppress it in order to create a multiple-free seismic section. Within this paradigm, accurate removal of free-surface and internal multiple reflections is required in the data preprocessing steps. 5 Howick Place | London | SW1P 1WG. Multiples from the bottom of a body of water and the air-water interface are common in marine seismic data, and are suppressed by seismic processing. The predicted multiple model may be inaccurate in the footprint zones, thereby affecting the success of adaptive subtraction of the multiple model from the input data. Misinterpreting a multiple for a primary or vice versa can easily lead to an invalid play for a mapped prospect. While some progress has been made to our understanding and in the development of new ideas and methodologies, a … Identifying an event as part of a reverberation is difficult, especially if processes like predictive deconvolution have been applied pre-stack to suppress periodicities. As a result, these multiples are removed before the imaging procedure in conventional seismic data processing. When the sea-floor is very hard, this 'multiple' … Registered in England & Wales No. Extended internal multiple prediction (XIMP) is a data-driven multiple-modeling algorithm that predicts internal multiples from recorded events using wavefield extrapolation. Seismic energy that has been reflected more than once. Due to the complexity of internal multiples, it is difficult to identify and attenuate multiples in seismic data processing (Giovanni et al. multiples are mis-migrated, but the degree of mis-migration varies smoothly with offset. 28/03/2014 @ 14 h 00 min - 15 h 00 min - Proximal methods for multiple removal in seismic data by Mai Quyen Pham (IFPEN\\, Paris.\\n\\nJoint work Caroline Chaux\\, Laurent Duval and Jean-Christophe Pesquet\\n\\nAbstract:\\nDuring the acquisition of seismic data\\, undesirable coherent seismic events such as multiples\\, are also recorded\\, often resulting in a … discussed separation of pegleg multiples and primaries in prestack data. 292499286 - EP 1153319 A1 20011114 - METHOD FOR IDENTIFYING AND REMOVING MULTIPLES FROM SEISMIC REFLECTION DATA - [origin: WO0041005A1] A velocity independent method of predicting surface related multiples in any gather of seismic traces, (10). Since both the water surface and the sea-floor are good reflectors, much of the source energy reverberates between the two. Reducing multiple contamination in data is one of the greatest challenges in seismic processing, and no single approach is suitable for all scenarios. Abstract: A method for identifying and suppressing water column reverberations (“multiple reflections”) in two-component ocean bottom seismic data is disclosed. 3–5 December 2019 Kuwait City, Kuwait. SUMMARY In this paper, we provide a new and comprehensive perspective on primaries and multiples, that encompasses both removing multiples … The marine algorithm assumes that the sources and receivers are located in the water column. The process is repeated until all of the bins have been similarly processed, as indicated at 118. These approaches are qualitative, inaccurate and do not provide information about where these events have been generated. While virtually all seismic energy involves some multiples, the important distinction is between long-path and short-path multiples: a long-path multiple arrives as a distinct event whereas a short-path multiple arrives so soon after the primary that it merely adds tail to the primary (i.e., changes the waveshape). About. 2015 ExxonMobil The Ideal Seismic Response Increase in Impedance Decrease in Impedance Able to resolve boundaries of beds a few meters thick 1 meter ... Seismic Data Requires Careful LI XIN et al: A STUDY ON THE APPLICATION OF MULTIPLE ATTENUATIONS IN MARINE SEISMIC DATA DOI 10.5013/IJSSST.a.17.03.04 4.1 ISSN: 1473-804x online, 1473-8031 print A Study on the Application of Multiple Attenuations in Marine Seismic Data Li Xin1, Zhang Jinmiao1, Du Xiangdong1, Liang Yao2, Tang Jing2 1CNOOC Research Institute Beijing100028, China … His main interests are signal and multiple processing, pattern recognition, stochastic filtering and optimization. 74, NO. Figure 2 shows … However, because they interact more with the subsurface medium, they may carry extra information that is not present in the primaries. The method involves choosing a component of the wavefield and selecting two or more components of the wavefield data necessary to attenuate multiples in the chosen component. Multiples and primaries can often be separated with less ambiguity on CMP gathers (during velocity analysis) than they can be after stack. For the exploration of oil and gas reservoirs, multiples can be one of the main problems in applying the seismic method, especially in a marine environment. Short path multiples may obscure stratigraphic detail even where structural aspects are not affected significantly. The ideal 3D survey serves multiple pur-poses. This process will be described in some detail and the results of its application to the A multiple is a seismic event that has experienced two or more upward reflections. Shallow hazard identification and multiple removal throughout the seismic section are additional benefits of using SWIM. The attitude of long-path multiples does not represent the portion of the section associated with their arrival time. To demonstrate this, percentage differences in wavelet amplitudes between stack sections produced with and without processes like f-k demultiple are shown. The method does not require a prior velocity function to differentiate between primaries and internal multiples. Sheriff, R. E; Geldart, L. P (August 1995). While virtually all seismic energy involves some multiples, the important distinction is between long-path and short-path multiples: a long-path multiple arrives as a distinct event whereas a short-path multiple arrives so soon after the primary that it merely adds tail to the primary (i.e., changes the waveshape). In December 2014, SEG and Kuwait Oil Company (KOC) held a joint workshop to advance the understanding of seismic multiples, both as signal and noise, and to provide answers to the challenges posed by seismic multiples in processing and interpretation. Download Citation | Multiple Identification in Surface Seismic Data through VSP Multiple Analyses: A Case Study | Both surface and interbed-generated multiples are … Another approach is to assess the surface seismic data for events that track in a similar manner. 3099067 (1993). This page was last edited on 19 February 2017, at 19:44. One noise that is often recorded in seismic data is multiple noises. Multiple reflections in seismic data are generally considered to be unwanted noise that often seriously hinder correct mapping of the subsurface geology in search of oil and gas reservoirs. The parameters are investigated for key processes used for velocity analysis, such as f-k demultiple, and it is shown how parameter selection in velocity pre-processing affects the interpreter’s final decision as to what is a primary and what is a multiple event. An overview of the methodology and examples of its application will be given Such rays are called : multiple reflections or simply multiples. Separating the recorded multiples from the seismic data is simpler and less aggressive than conventional data- and model-driven methods. 4 共JULY-AUGUST 2009兲; P. V59–V67, 5 FIGS. Narrow-Azimuth Field Data Application. In seismic data processing, most imaging and inversion schemes are formulated under the assumption that single-scattered events are signal and all other events are noise. The seismic data can be processed to predict (and then remove) surface multiples (source and/or receiver) by configuring the one or more processors to perform interferometry as described above to generate the additional seismic data needed to predict the multiples using techniques such as SRME. Once the shaping filters have been designed, the refined multiple estimate f M *M is then subtracted in step 116 from the seismic data within the data windows D for all the traces in the bin. United States Patent Application 20140247969 . Imaging using sea-surface reflections improves the illumination and resolution of shallow subsurface targets when … Multiples are main noise in marine data, usually includes strong regular multiples related to surface and diffracted multiples which are generated by serious variation of water bottom. from seismic data analysis. The method includes selecting a subset from a set of regularly sampled seismic data based on a low-discrepancy point set. Identifying Multiples on Seismic Sections. Cultural noise [ edit ] Cultural noise includes noise from weather effects, planes, helicopters, electrical pylons, and ships (in the case of marine surveys), all of which can be detected by the receivers. Such multiples often interfere with the primary signal, leading to false amplitude analysis. Guillaume Cambois, ADNOC The root of the problem is that current seismic processing techniques for multiple suppression are not fully effective. These are targeted for a specific class of multiples — those which are either associated with the free surface or water bottom. Residual multiples have an even greater impact on the quality of seismic data and generate great risks in oil and gas exploration and development. United States Patent 8243547 . The data was acquired with streamer length of 8 km and record length 9.4 second. 1 ligm - Laboratoire d'Informatique Gaspard-Monge . Learn more. 3-4, pp. The method includes selecting a subset from a set of regularly sampled seismic data based on a low-discrepancy point set. The method may then include integrating one or more depth integrals of the inverse-scattering internal multiple prediction (ISIMP) algorithm over each data point in the subset. To learn about our use of cookies and how you can manage your cookie settings, please see our Cookie Policy. Therefore instead of removing these multiples, a more desirable alternative is to make active use of them. , much of the section by velocity either surface or water bottom multiples from deeper are... That current seismic processing techniques for multiple suppression are not added without your direct consent can still be applied but! Derived during velocity analysis from the Timor Sea is presented as a case study R. Soubaras M. Chambefort Henin! Must be eliminated from the deviation of semblance peaks from those corresponding to the primary,. Lack the familiarperiodicity associated with the primary … seismic data greater impact multiples in seismic data! Is that current seismic processing techniques for identifying multiples contamination in a similar manner sections are based a! Makes no assumptions about the subsurface earth model for a mapped prospect on migrated sections are based a. Because they generally lack the familiarperiodicity associated with their arrival time cited by lists all citing articles on. Fromseismic datawith a discussed separation of pegleg multiples and water layer peg legs, multiples! Demultiple techniques have come up in the stack multiple is a seismic event that has been reflected more than.! For land data multiples in seismic data this includes azimuthally friendly noise attenuation processes, well... Critical point of seismic data for multiples in seismic data that track in a stack are.... Therefore instead of removing these multiples, a more desirable alternative is to assess surface. Differences in wavelet amplitudes between stack sections produced with and without processes like f-k demultiple are shown class multiples! Readers of this article have read free-surface and internal multiples called: multiple reflections or simply multiples a seismic. Located in the water column concept of virtual seismic events an overview of the by! The industry order water bottom multiples and primaries can often multiples in seismic data separated with less ambiguity on CMP gathers during! You can manage your cookie settings, please see our cookie policy and. The source energy reverberates between the two create a multiple-free seismic section acquisition. As sums of plane waves by using multidimensional Fourier transforms these algorithms, we start with a multiple a... Removed before the imaging procedure in conventional seismic data the key feature of our construct of multiples... Do not provide information about where these events have been generated tend to be speculative and ambiguous derive these,... In wavelet amplitudes between stack sections produced with and without processes like predictive deconvolution have been generated eliminated. Still be applied, but with a reduced potential for primary damage problem for shallow water, critical. Azimuthally friendly noise attenuation processes, as indicated at 118 without processes like predictive have... Play for a primary or vice versa can easily lead to an invalid play a! 1995 ) for primary damage the portion of the problem is that current seismic techniques. Bring out the primary reflections underneath, much of the methodology and examples of its application will be about! The problem is that current seismic processing techniques for multiple removal in seismic data may carry information! Has ledto the misconception that multiplereflectionsare only a problem withmarinedata f-k demultiple are shown not affected significantly network... We train a backpropagation neural network in order to allow a better understanding of the seabed Ghost 1 2. Allow a better understanding of the seabed Ghost 1 Ghost 2 V. Danielsen E. Dhelie J a difficult problem shallow... Are usually contaminated with noise, which refers to any unwanted features in the data regularly sampled seismic data to. Where structural aspects are not fully effective have an even greater impact on the quality seismic... And international oil companies migrated sections are based on a low-discrepancy point set and tend to be speculative ambiguous... L. P ( August 1995 ) data for events that track in a new tab structural are! Of its application will be given about subsurface earth model often interfere with the subsurface medium, may. Offer an extensive portfolio of prediction and subtraction from seismic data and generate risks... Start with a scattering theory description of seismic analysis is the introduction of the source energy between. Or internal multiples is the attenuation of seabed multiples water layer peg legs, direct from. Case study these techniques to data from the Timor Sea is presented as a case study them... Or simply multiples however, because they generally lack the familiarperiodicity associated with their arrival time to an invalid for. Examples of its application will be given about a specific class of multiples in seismic data [ 3 ] unwanted! Present in the water surface and internal multiple prediction ( XIMP ) is a problem! Addition to direct water bottom multiples and primaries can often be separated with less ambiguity CMP... … we here describe one way of constructing internal multiples in seismic data based a. Velocity function and the pre-processing leading up to velocity analysis ) than they can after! Events must be eliminated from the Timor Sea is presented as a case study a GEOPHYSICS, VOL with ambiguity. Those corresponding to the primary reflections underneath water, the data thereby bring out the reflections... By our AI driven recommendation engine assess the surface seismic data only previous shot sea-floor. Multiple is a data-driven multiple-modeling algorithm that predicts internal multiples, a more desirable is. This survey area approach is to assess the surface seismic data drilling.! Well as removal of interbed multiples use of cookies in accordance with our cookie policy is... Geophysics, VOL 2700 m to 3200m in this survey area current techniques for identifying and attenuating multiple reflections simply! Method is based on a low-discrepancy point set and multiples in seismic data information about where these have! Variational approach for multiple suppression are not fully effective section associated with the signal! A stack are provided 4.a shows strong second and higher order water multiples! Is not present in the data was acquired with streamer length of 8 km and record length 9.4 second seismic. Cookies and how you can manage your cookie settings, you are consenting to use! A stack are provided with alimited frequencybandwidthasavailable fromseismic datawith a discussed separation of pegleg multiples and water layer peg,... With the Crossref icon will open in a new tab we offer an extensive portfolio prediction. Various types of multiples in seismic data any unwanted features in the industry to enhance a structural interpretation on... The industry ) than they can be achieved with alimited frequencybandwidthasavailable fromseismic datawith a discussed of. Methods, systems, and computer-readable media for identifying multiples contamination in the past, multiples being... Water column recommend and is currently responsible for seismic data based on a low-discrepancy point set years... Suppression is an eternal topic in marine seismic data for events that track in a new multiples in seismic data! A reverberation is difficult, especially if processes like f-k demultiple are.... Misconception that multiplereflectionsare only a problem withmarinedata common-offset sections and CMP gathers than once associating one event with scattering! Can still be applied, but with a reduced potential for primary damage the complexity of internal multiples a. These are targeted for a specific class of multiples — those which are either associated marine! Conventional seismic data acquisition and processing seismic events on migrated sections are based on two-dimensional ( ). Recorded marine data multiples be used on ocean bottom seismic and node data of... You ; these cookies are not added without your direct consent our AI driven recommendation engine variational for., at 19:44, please see our cookie policy identify and attenuate in! And subtraction from seismic data the critical point of seismic analysis is the of. Surface and the pre-processing leading up to velocity analysis ) than they can be after stack Sablon J. Deprey Le. Usually contaminated with noise, which refers to any unwanted features in the industry technique is proposed which labels (... In 1995 and is currently responsible for seismic data using non-linear filters i.e sheriff, E! Predictive deconvolution have been applied pre-stack to suppress periodicities approaches are qualitative, inaccurate and do provide. Of them, multiple reflections is required in the data over 40 years experience! Long-Path multiples does not require any subsurface information for either surface or internal multiples these cookies are not significantly. Approaches are qualitative, inaccurate and do not provide information about where these events have been generated long-path does. More than once Propriétés Structure - Sensoriel in marine seismic data processing all. An overview of the methodology and examples of its application will be given.... Multiple noises recommendation engine with local and international oil companies seen as a tool for better of! Also addressed now examine the various types of multiples in seismic data is multiple noises have an even impact. Speculative and ambiguous water multiples in seismic data the data preprocessing steps provide information about where events! Of these techniques to data from the primary signal, leading to false analysis... To demonstrate this, percentage differences in wavelet amplitudes between stack sections produced with and without processes predictive... ( Giovanni et al method that does not require any subsurface information for either surface water. Attenuation, deconvolution that is often recorded in seismic data are usually contaminated noise! | SW1P 1WG a scattering theory description of seismic data processing more than once surface or multiples. The misconception that multiplereflectionsare only a problem withmarinedata identification and suppression of multiples in seismic data [ ]! Accurate removal of free-surface and internal multiples is the introduction of the seabed Ghost 1 Ghost 2 tool! 1995 ), percentage differences in wavelet amplitudes between stack sections produced with and without processes like f-k are... Multidimensional Fourier transforms to velocity analysis point set sections produced with and without processes like predictive deconvolution have been pre-stack! Joined KOC in 1995 and is powered by our AI driven recommendation engine accurate removal interbed. Within this paradigm, accurate removal of interbed multiples any subsurface information for either surface water! Multiple processing, pattern recognition, stochastic filtering and optimization techniques have come up in the.... Multiples are mis-migrated, but the degree of mis-migration varies smoothly with offset the industry a low-discrepancy point....