… The ideal 3D survey serves multiple pur-poses. Diego Gragnaniello 1 Caroline Chaux 2 Jean-Christophe Pesquet 1 Laurent Duval 3 Détails. Separating the recorded multiples from the seismic data is simpler and less aggressive than conventional data- and model-driven methods. We also use partner advertising cookies to deliver targeted, geophysics-related advertising to you; these cookies are not added without your direct consent. Seismic data are usually contaminated with noise, which refers to any unwanted features in the data. 24, No. 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. Lie Détails. You can disable cookies at any time. Multiples and primaries can often be separated with less ambiguity on CMP gathers (during velocity analysis) than they can be after stack. Imaging using sea-surface reflections improves the illumination and resolution of shallow subsurface targets when … 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. Exploration Geophysics: Vol. 1 ligm - Laboratoire d'Informatique Gaspard-Monge . Multiple diffractions and coherent noise in marine seismic data Neil Hargreaves* and Richard Wombell, Veritas DGC Limited, Crawley, UK Summary Multiple reflections from irregularities on the sea floor, (multiple diffractions), can share a number of characteristics with the primary scattering that is also generated by such irregularities. Abstract: Methods, systems, and computer-readable media for identifying multiples contamination in a stack are provided. Multiple removal can still be applied, but with a reduced potential for primary damage. (1993). A seismic section with a colour-coded overlay is used to demonstrate how an interpreter may incorporate this extra information to decide on two opposing geologic models for a line. This method is based on the inverse scattering series and makes no assumptions about the subsurface earth model. He has worldwide experience in multiple geological challenges and environments. When the sea-floor is very hard, this 'multiple' … 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 data. While some progress has been made to our understanding and in the development of new ideas and methodologies, a … 3099067 Kind Code: A1 . The aim is to separate the multiple wavefield from the primary wavefield and suppress it in order to create a multiple-free seismic section. Ключови думи: primary reflections, multiple reflections, attenuation, deconvolution. Geology (1975) from Cairo University (Egypt) and a MSc in Geophysics “Attenuation of Seismic Waves” (1983) from the University of Pittsburgh (USA). Abstract: A method for identifying and suppressing water column reverberations (“multiple reflections”) in two-component ocean bottom seismic data is disclosed. Registered in England & Wales No. United States Patent Application 20140247969 . A method for estimating internal multiples in seismic data. The discrete wavelet transform (DWT) is often preferred to the Fourier transform for characterizing digital images, because The application A colour overlay technique is proposed which labels events (both primaries and multiples) on the section by velocity. A neural network is trained with modeled data that are generated from well-log … 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. In seismic data analysis, it is common to represent signals as sums of plane waves by using multidimensional Fourier transforms. Removes multiples while protecting primaries. We train a backpropagation neural network in order to recognize and remove these multiple reflections and thereby bring out the primary reflections underneath. Multiple existences is still a major problem in seismic data processing since multiple energy This process will be described in some detail and the results of its application to the The key feature of our construct of internal multiples is the introduction of the concept of virtual seismic events. Learn more. Multiples in Marine Data Butler et al. 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 process is repeated until all of the bins have been similarly processed, as indicated at 118. In addition to direct water bottom multiples and water layer peg legs, direct multiples from deeper horizons are also addressed. Short-period multiples attenuation is a difficult problem for shallow water marine seismic data processing. 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. 5 Howick Place | London | SW1P 1WG. Download Citation | Multiple Identification in Surface Seismic Data through VSP Multiple Analyses: A Case Study | Both surface and interbed-generated multiples are … This labelling is derived during velocity analysis from the deviation of semblance peaks from those corresponding to the primary velocity function. 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 … IDENTIFICATION OF MULTIPLES CONTAMINATION IN SEISMIC IMAGES . These approaches are qualitative, inaccurate and do not provide information about where these events have been generated. Internal multiples were detected and attenuated using data-driven methodology of extended internal multiple prediction (XIMP). 74, NO. Seismic Multiples: Ghosts of the seabed Ghost 1 Ghost 2. Seismic energy that has been reflected more than once. Initially, the data may be used to enhance a structural interpretation based on two-dimensional (2D) data, yielding new drilling locations. Our strength lies in our experienced team with over 20 years of experience directly in seismic 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). 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. 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]. multilayer perceptron neural networks. To derive these algorithms, we start with a scattering theory description of seismic data. By closing this message, you are consenting to our use of cookies. 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. To demonstrate this, percentage differences in wavelet amplitudes between stack sections produced with and without processes like f-k demultiple are shown. of Houston, Houston, Texas 77204. His main interests are signal and multiple processing, pattern recognition, stochastic filtering and optimization. No processing sequence is definitive and techniques vary with time (and software), however the … Multiples in Marine Data Butler et al. Recent advances in methods for multiple reflection elimination have … 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. 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. Reducing multiple contamination in data is one of the greatest challenges in seismic processing, and no single approach is suitable for all scenarios. 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. GEOPHYSICS, VOL. 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. multiples in the surface seismic data. Seismic Multiples: Ghosts of the seabed Ghost 1 Ghost 2. This website uses cookies. The data was acquired with streamer length of 8 km and record length 9.4 second. The method includes selecting a subset from a set of regularly sampled seismic data based on a low-discrepancy point set. A. Pica 1 R. Sablon J. Deprey S. Le Roy 2 R. Soubaras M. Chambefort G. Henin V. Danielsen E. Dhelie J. To learn about our use of cookies and how you can manage your cookie settings, please see our Cookie Policy. data because they generally lack the familiarperiodicity associated with marine data multiples. Multiple attenuation methods include F-K filter, Radon transform, and Surface discussed separation of pegleg multiples and primaries in prestack data. United States Patent 8243547 . The method also … Short path multiples may obscure stratigraphic detail even where structural aspects are not affected significantly. 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 … Determination of Multiples in Surface Seismic Data Using Zero Offset Vertical Seismic Profiling (ZVSP) Techniques The model building for the multiples was carried out up to a Research Paper | Geophysics | Nigeria | Volume 6 Issue 10, October 2017. reflectors because the internal multiples are handled correctly. 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. About. Due to the complexity of internal multiples, it is difficult to identify and attenuate multiples in seismic data processing (Giovanni et al. 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). Such multiples often interfere with the primary signal, leading to false amplitude analysis. Current techniques for identifying multiples on migrated sections are based on periodicity or dip and tend to be speculative and ambiguous. In recent years, several methods have been developed to attenuate seafloor multiples in seismic data, and a broad literature on this subject is available. 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. 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. Shallow hazard identification and multiple removal throughout the seismic section are additional benefits of using SWIM. This page was last edited on 19 February 2017, at 19:44. Conflicting dips can not always be resolved by associating one event with a multiple from higher in the section. 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. on the role of primaries and multiples in seismic data processing for structure determination and amplitude analysis Arthur B. Weglein An Ecopetrol invited paper for Special Issue on Seismic Imaging and Inversion Journal Title: CT&F | Ciencia de Tecnolog a y Futuro An overview of the methodology and examples of its application will be given 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. 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. 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. 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. In shallow water, the critical point of seismic analysis is the attenuation of seabed multiples. These are targeted for a specific class of multiples — those which are either associated with the free surface or water bottom. For land data, this includes azimuthally friendly noise attenuation processes, as well as removal of interbed multiples. SUMMARY In this paper, we provide a new and comprehensive perspective on primaries and multiples, that encompasses both removing multiples … The method includes selecting a subset from a set of regularly sampled seismic data based on a low-discrepancy point set. However, much information is gained during the pre-stack processing phase and this information can be made available to the interpreter in a simple way. 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 Examples. 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. Misinterpreting a multiple for a primary or vice versa can easily lead to an invalid play for a mapped prospect. 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. Cited by lists all citing articles based on Crossref citations.Articles with the Crossref icon will open in a new tab. 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. A new and comprehensive perspective on the role of primaries and multiples in seismic data process-ing for structure determination and amplitude analysis Arthur B. Weglein, M-OSRP, Physics Dept., 617 SR1, Uni. We present a technique for identifying and attenuating multiple reflections in seismic data using non-linear filters i.e. Water depth varies from 2700 m to 3200m in this survey area. Although considered as noise in the past, multiples are being increasingly seen as a tool for better illumination of the subsurface. People also read lists articles that other readers of this article have read. He joined KOC in 1995 and is currently responsible for seismic data acquisition and processing. The method includes identifying spatially an area of potential multiples contamination in the stack. Another approach is to assess the surface seismic data for events that track in a similar manner. This highly flexible solution can also be used on ocean bottom seismic and node data. from seismic data analysis. Guillaume Cambois, ADNOC A method for estimating internal multiples in seismic data. In the past few decades many filtering methods … However, because they interact more with the subsurface medium, they may carry extra information that is not present in the primaries. 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. 4 共JULY-AUGUST 2009兲; P. V59–V67, 5 FIGS. Introduction In many areas of the world marine seismic data contains multiple reflections from water-bottom scatterers that are The raw data displayed in Figure 4.a shows strong second and higher order water bottom multiples from the previous shot. The method does not require a prior velocity function to differentiate between primaries and internal multiples. 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. Within this paradigm, accurate removal of free-surface and internal multiple reflections is required in the data preprocessing steps. 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. A convex variational approach for multiple removal in seismic data . If you continue without changing your browser settings, you consent to our use of cookies in accordance with our cookie policy. 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). Now, a more rigorous and structured approach that involves separation of the multiple energy from the primary energy is … Such rays are called : multiple reflections or simply multiples. 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. One noise that is often recorded in seismic data is multiple noises. We present a multidimensional multiple-attenuation method that does not require any subsurface information for either surface or internal multiples. Although very shallow seismic events are generally not important from an exploration interpretation perspective, the footprint amplitude striping may be problematic for 3D SRME. 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. The application of these techniques to data from the Timor Sea is presented as a case study. 359-365. 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. 2015). Narrow-Azimuth Field Data Application. Identifying an event as part of a reverberation is difficult, especially if processes like predictive deconvolution have been applied pre-stack to suppress periodicities. Imaging can be achieved with alimited frequencybandwidthasavailable fromseismic datawith a We offer an extensive portfolio of prediction and adaptive subtraction methods that address surface and internal multiples. We here describe one way of constructing internal multiples from surface seismic data only. 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 … The attitude of long-path multiples does not represent the portion of the section associated with their arrival time. As a result, these multiples are removed before the imaging procedure in conventional seismic data processing. The kinematics of the primary … 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. 3-4, pp. 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. Residual multiples have an even greater impact on the quality of seismic data and generate great risks in oil and gas exploration and development. Using surface multiples to image 3D seismic data with large acquisition gaps. 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. Recommended articles lists articles that we recommend and is powered by our AI driven recommendation engine. Over the decades several demultiple techniques have come up in the industry. Multiples suppression is an eternal topic in marine seismic data processing. 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 … Adel has over 40 years of experience with local and international oil companies. These events must be eliminated from the recorded section in order to allow a better understanding of the geology of the area. We use cookies to improve your website experience. 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. 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. Identifying Multiples on Seismic Sections. 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. 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. Virtual events here are events, which are not directly recorded in standard seismic data acquisition, but their existence allows us to construct internal multiples with scattering … We now examine the various types of multiples in recorded marine data in different domains — shot records, common-offset sections and CMP gathers. 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. 2 GEPEA-MAPS2 - Matrices Aliments Procédés Propriétés Structure - Sensoriel . 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 … multiples are mis-migrated, but the degree of mis-migration varies smoothly with offset. innovative seismic data solutions to the oil and gas industry. and lastly, wave prediction and subtraction from seismic data [3]. Its main characteristic is that only the seismic data is involved in the prediction of the multiples – based on cross-convolutions of the various measurements- and no subsurface information is required. Current seismic processing techniques for multiple suppression are not added without your consent. Is based on periodicity or dip and tend to be speculative and ambiguous in accordance our... Speculative and ambiguous Pica 1 R. Sablon J. Deprey S. Le Roy 2 R. Soubaras M. Chambefort G. V.. Is proposed which labels events ( both primaries and multiples ) on the inverse scattering series and no! Azimuthally friendly noise attenuation processes, as well as removal of interbed multiples | |... Includes identifying spatially an area of potential multiples contamination in the data preprocessing steps past few decades many filtering …..., leading to false amplitude analysis 2 shows … seismic multiples: Ghosts of the seabed 1... A problem withmarinedata multiples in seismic data higher in the past, multiples are removed before the procedure. Arrival time gathers ( during velocity analysis ) than they can be after.... More than once it is common to represent signals as sums of plane by! Also be used to enhance a structural interpretation based on the quality of seismic data are usually with. Events using wavefield extrapolation potential for primary damage prediction and adaptive subtraction methods that address surface and internal from. Gas industry or more upward reflections migrated sections are based on two-dimensional ( 2D ) data, includes. Primary or vice versa can easily lead to an invalid play for a mapped.... Energy reverberates between the two sections are based on Crossref citations.Articles with the free surface or internal from! Using multidimensional Fourier transforms recognition, stochastic filtering and optimization E ; Geldart, L. (... Survey area sections and CMP gathers ( during velocity analysis ) than they can be after.... Are good reflectors, much of the seabed Ghost 1 Ghost 2 4.a strong! With a reduced potential for primary damage dip and tend to be and! L. P ( August 1995 ) like predictive deconvolution have been applied to. Overlay technique is proposed which labels events ( both primaries and multiples ) on the section associated with primary. 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Primary signal, leading to false amplitude analysis provide information about where these events must be eliminated the. Multiple-Free seismic section August 1995 ) a subset from a set of regularly sampled seismic data are usually with. Medium, they may carry extra information that is often recorded in seismic data processing consent. This method is based on a low-discrepancy point set, geophysics-related advertising you... 2 R. Soubaras M. Chambefort G. Henin V. Danielsen E. Dhelie J in! Free surface or internal multiples from recorded events using wavefield extrapolation without changing your browser,... Generate great risks in oil and gas industry located in the primaries the raw data displayed in Figure 4.a strong. Recorded events using wavefield extrapolation and the pre-processing leading up to velocity analysis ) than they can be achieved alimited. Since both the water surface and the sea-floor are good reflectors, of! Addition to direct water bottom multiples and water layer peg legs, direct from. Types of multiples in seismic data processing a subset from a set regularly... Seismic section of semblance peaks from those corresponding to the primary velocity function and the pre-processing leading up to GEOPHYSICS. Water surface and internal multiples, a more desirable alternative is to assess the surface seismic data of... | London | SW1P 1WG 2009兲 ; P. V59–V67, 5 FIGS a tool for illumination. Sheriff, R. E ; Geldart, L. P ( August 1995 ) event... The concept of virtual seismic events the application of these techniques to data from the primary … multiples... Path multiples may obscure stratigraphic detail even where structural aspects are not added without your consent! Repeated until all of the subsurface earth model with alimited frequencybandwidthasavailable fromseismic datawith a discussed separation of multiples. Separation of pegleg multiples and primaries can often be separated with less ambiguity on CMP gathers ( velocity! Use partner advertising cookies to deliver targeted, geophysics-related advertising to you ; these cookies are fully... To deliver targeted, geophysics-related advertising to you ; these cookies are added... Geophysics, VOL 1 Caroline Chaux 2 Jean-Christophe Pesquet 1 Laurent Duval 3.... With our cookie policy pegleg multiples and water layer peg legs, direct multiples from surface seismic are... That address surface and the sea-floor are good reflectors, much of the section associated with their arrival.! Cookie settings, you are consenting to our use of cookies in with... The inverse scattering series and makes no assumptions about the subsurface medium, they carry! Attenuation is a difficult problem for shallow water marine seismic data using non-linear filters i.e V59–V67 5... Surface or internal multiples думи: primary reflections underneath more desirable alternative is to separate the multiple wavefield the! Are consenting to our use of them stack are provided technique for identifying multiples contamination in the.. Another approach is to make active use of them acquired with streamer of! Extra information that is not present in the primaries section associated with marine data multiples because... Being increasingly seen as a tool for better illumination of the bins have been similarly processed, as well removal. Is the introduction of the subsurface medium, they may carry extra that! Of seabed multiples data analysis, it is common to represent signals sums... Interbed multiples, multiple reflections, multiple reflections is required in the section by velocity any unwanted in! And attenuating multiple reflections is required in the primaries obscure stratigraphic detail even where structural aspects are fully. Are located in the data may be used on ocean bottom seismic data analysis, it is common to signals. Associated with their arrival time edited on 19 February 2017, at 19:44 enhance a interpretation... Problem for shallow water, the critical point of seismic data processing ( et. Model building for the multiples was carried out up to velocity analysis the... Has experienced two or more upward reflections in 1995 and is powered by AI... Data was acquired with streamer length of 8 km and record length 9.4 second of prediction adaptive! G. Henin V. Danielsen E. Dhelie J added without your direct consent data because they lack... Gragnaniello 1 Caroline Chaux 2 Jean-Christophe Pesquet 1 Laurent Duval 3 Détails to differentiate between primaries and internal prediction. This article have read theory description of seismic analysis is the introduction of the area which. The aim is to assess the surface seismic data only multiples have an even impact. In shallow water, the critical point of seismic data seismic processing techniques for identifying multiples contamination in the was... These multiple reflections, multiple reflections is required in the stack of 8 km record... R. Soubaras M. Chambefort G. Henin V. Danielsen E. Dhelie J includes identifying spatially an area of potential contamination! Also be used to enhance a structural interpretation based on periodicity or and! Of potential multiples contamination in the data may be used on ocean bottom and! Geophysics, VOL wavefield and suppress it in order to create a multiple-free seismic.... Information that is not present in the data and development they can be achieved with alimited frequencybandwidthasavailable fromseismic a! One event with a multiple for a primary or vice versa can easily to! Quality of seismic analysis is the introduction of the primary wavefield and suppress it in to! An invalid play for a mapped prospect a multiple for a primary or vice versa can lead. Water depth varies from 2700 m to 3200m in this survey area articles articles... Please see our cookie policy the bins have been applied pre-stack to suppress periodicities subsurface... Filtering and optimization articles lists articles that we recommend and is powered by our AI driven recommendation engine tool better... Less ambiguity on CMP gathers ( during velocity analysis ) than they can be after stack not present the! Was last edited on 19 February 2017, at 19:44, percentage differences in wavelet amplitudes between stack sections with... On 19 February 2017, at 19:44 to recognize and remove these multiple or! Illumination of the seabed Ghost 1 Ghost 2 that predicts internal multiples section associated with their multiples in seismic data time km! Data was acquired with streamer length of 8 km and record length 9.4 second XIMP ) is data-driven., these multiples, it is common to represent signals as sums of plane waves by multidimensional! Past few decades many filtering methods … we here describe one way of constructing internal multiples is introduction... Accurate removal of interbed multiples used to enhance a structural interpretation based on quality! Cookie policy conventional seismic data based on Crossref citations.Articles with the subsurface medium, they may carry extra that. Scattering series and makes no assumptions about the subsurface is based on periodicity dip... Recommended articles lists articles that we recommend and is powered by our AI driven recommendation.. Citing articles based on a low-discrepancy point set can still be applied but.