Pub Date : 2021-10-18DOI: 10.3997/2214-4609.202113232
E. Duveneck
Summary I present a method for computing reflection angle gathers using time-shift extended least-squares reverse-time migration. The method is aimed at producing image gathers that can be interpreted in terms of angle-dependent reflection coefficients, also under complex overburdens. It is based on a two-step procedure involving an iterative inversion to estimate a time-shift extended representation of the subsurface reflectivity, followed by a transform of this reflectivity to the reflection angle domain. Using a formulation in terms of time-shift extended imaging allows to naturally handle complex wave-field effects like multi-pathing. The main building blocks of the method include an adjoint pair of time-shift extended linearized modelling and imaging operators, an effective time-shift extended-domain preconditioner and a transform from the time-shift domain to the reflection angle domain that properly handles amplitudes. The method is demonstrated on a synthetic data example.
{"title":"Angle gathers from time-shift extended least-squares reverse-time migration","authors":"E. Duveneck","doi":"10.3997/2214-4609.202113232","DOIUrl":"https://doi.org/10.3997/2214-4609.202113232","url":null,"abstract":"Summary I present a method for computing reflection angle gathers using time-shift extended least-squares reverse-time migration. The method is aimed at producing image gathers that can be interpreted in terms of angle-dependent reflection coefficients, also under complex overburdens. It is based on a two-step procedure involving an iterative inversion to estimate a time-shift extended representation of the subsurface reflectivity, followed by a transform of this reflectivity to the reflection angle domain. Using a formulation in terms of time-shift extended imaging allows to naturally handle complex wave-field effects like multi-pathing. The main building blocks of the method include an adjoint pair of time-shift extended linearized modelling and imaging operators, an effective time-shift extended-domain preconditioner and a transform from the time-shift domain to the reflection angle domain that properly handles amplitudes. The method is demonstrated on a synthetic data example.","PeriodicalId":265130,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133596910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.3997/2214-4609.202113257
W. Jia, J. Gao, H. Li, M. Cao, Q. Zeng
Summary In the regions with igneous rocks, it is very difficult to conduct velocity modelling and velocity imaging because of large buried depth, low signal-to-noise ratio of seismic data, large change of lithologies, drastic change of lateral velocity and complex seismic wave field. In this paper, an igneous rock velocity modelling method based on facies-controlled inversion is proposed and applied to migration imaging. Firstly, based on the analysis of lithofacies in this method, the active periods and lithofacies of volcanic rocks are determined, and the initial velocity model is established by using facies-controlled velocity inversion. Secondly, a high-precision velocity model is constructed by multi-information constrained target inversion method. This method has been successfully applied in many prospect areas in western China. Through the comparative analysis of imaging sections and comprehensive attributes, it shows that this method can eliminate the inherited pseudo structures and pseudo faults in the underlying strata of igneous rocks to the maximum extent, and restore the real underground structures, which provides a reference for the velocity-depth modelling and imaging of similar special geologic bodies.
{"title":"A Velocity Model Building Method in the Igneous Rock Based on Facies-controlled Inversion","authors":"W. Jia, J. Gao, H. Li, M. Cao, Q. Zeng","doi":"10.3997/2214-4609.202113257","DOIUrl":"https://doi.org/10.3997/2214-4609.202113257","url":null,"abstract":"Summary In the regions with igneous rocks, it is very difficult to conduct velocity modelling and velocity imaging because of large buried depth, low signal-to-noise ratio of seismic data, large change of lithologies, drastic change of lateral velocity and complex seismic wave field. In this paper, an igneous rock velocity modelling method based on facies-controlled inversion is proposed and applied to migration imaging. Firstly, based on the analysis of lithofacies in this method, the active periods and lithofacies of volcanic rocks are determined, and the initial velocity model is established by using facies-controlled velocity inversion. Secondly, a high-precision velocity model is constructed by multi-information constrained target inversion method. This method has been successfully applied in many prospect areas in western China. Through the comparative analysis of imaging sections and comprehensive attributes, it shows that this method can eliminate the inherited pseudo structures and pseudo faults in the underlying strata of igneous rocks to the maximum extent, and restore the real underground structures, which provides a reference for the velocity-depth modelling and imaging of similar special geologic bodies.","PeriodicalId":265130,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132370976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.3997/2214-4609.202112989
S. Wang
Summary The transient percolation mathematical model with threshold pressure gradient in vertically fractured multi-well system is developed and solved by using finite element method. Then the wellbore storage coefficient and skin factor are introduced by Laplace Transformation and Stethfest Inversion. In this paper, simulated computation of fractured multi-well system is made by taking the element of rectangular well pattern in the circular impermeable reservoir as an example, and type curves of pressure behavior are drawn. The characteristic of type curves and influences of well property, productivity in adjacent wells, injection-production ratio, well spacing and fracture conductivity are analyzed. The study shows that the testing data of production wells are easily influenced by adjacent wells in the subordinate phase of oil and gas field development. During the well test interpretation, using fractured multi-well system model can eliminate the interferences to a large extent, and improve the utilization and effect of well testing data.
{"title":"Pressure Transient Analysis in Vertically Fractured Multi-well System","authors":"S. Wang","doi":"10.3997/2214-4609.202112989","DOIUrl":"https://doi.org/10.3997/2214-4609.202112989","url":null,"abstract":"Summary The transient percolation mathematical model with threshold pressure gradient in vertically fractured multi-well system is developed and solved by using finite element method. Then the wellbore storage coefficient and skin factor are introduced by Laplace Transformation and Stethfest Inversion. In this paper, simulated computation of fractured multi-well system is made by taking the element of rectangular well pattern in the circular impermeable reservoir as an example, and type curves of pressure behavior are drawn. The characteristic of type curves and influences of well property, productivity in adjacent wells, injection-production ratio, well spacing and fracture conductivity are analyzed. The study shows that the testing data of production wells are easily influenced by adjacent wells in the subordinate phase of oil and gas field development. During the well test interpretation, using fractured multi-well system model can eliminate the interferences to a large extent, and improve the utilization and effect of well testing data.","PeriodicalId":265130,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132172586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.3997/2214-4609.202113087
G. Bancalà, S. Ratti, M. Speziali, F. Winter
Summary Red Sea represents an example of paramount importance in understanding the transition from continental rifting to seafloor spreading and hydrocarbon formation. However, it remains underexplored compared to the Arabian Gulf because of very challenging conditions and vastness. The region lacks homogeneous data coverage, high-quality structural data and quantitative models, all necessary to plan future explorations. We discuss a multiscale modelling workflow including an integrated multi-physics interpretation to unravel the Northern Red Sea complexity. Applied workflow consists of three main tiers. Firstly, available potential fields data were merged with public-domain and legacy data, analyzed in frequency domain, filtered, and enhanced to derive key regional structural elements on interpreted maps. Analytic solutions of regional Moho and basement reliefs were derived using layered inversion of gravity and magnetics. Newly acquired seismic and non-seismic data were, thus integrated with available well logs and public domain data to derive an integrated earth model. The regional models were iteratively refined through 2.5D and 3D modelling with a cooperative approach between seismic and potential fields domain to provide a characterization from regional to local scale. The objective is improving multiscale understanding and supporting future exploration activities in the area by integrating all available geological and geophysical information.
{"title":"Multiscale potential field modelling and integrated interpretation in the underexplored Northern Red Sea","authors":"G. Bancalà, S. Ratti, M. Speziali, F. Winter","doi":"10.3997/2214-4609.202113087","DOIUrl":"https://doi.org/10.3997/2214-4609.202113087","url":null,"abstract":"Summary Red Sea represents an example of paramount importance in understanding the transition from continental rifting to seafloor spreading and hydrocarbon formation. However, it remains underexplored compared to the Arabian Gulf because of very challenging conditions and vastness. The region lacks homogeneous data coverage, high-quality structural data and quantitative models, all necessary to plan future explorations. We discuss a multiscale modelling workflow including an integrated multi-physics interpretation to unravel the Northern Red Sea complexity. Applied workflow consists of three main tiers. Firstly, available potential fields data were merged with public-domain and legacy data, analyzed in frequency domain, filtered, and enhanced to derive key regional structural elements on interpreted maps. Analytic solutions of regional Moho and basement reliefs were derived using layered inversion of gravity and magnetics. Newly acquired seismic and non-seismic data were, thus integrated with available well logs and public domain data to derive an integrated earth model. The regional models were iteratively refined through 2.5D and 3D modelling with a cooperative approach between seismic and potential fields domain to provide a characterization from regional to local scale. The objective is improving multiscale understanding and supporting future exploration activities in the area by integrating all available geological and geophysical information.","PeriodicalId":265130,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133866295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.3997/2214-4609.202113149
S. Patruno, A. Green, D. Caldarella, V. Scisciani, J. Corcoran, M. Nuzzo, M. Przywara, G. Gillott
Summary A potential carbon capture and storage (CCS) fill-and-spill mega-fairway is here identified in UKCS Quadrants 43-44, by combining regional wellbore data with 3D seismic interpretation and migration modelling. In the study area, the Triassic Bunter Sandstone reservoir shows consistent thicknesses (90-216 m) and prospective core-based porosities and permeabilities (11-28%, 9-669 mD). A connected reservoir is suggested regionally from consistent, near-hydrostatic aquifer pressure gradients (~0.51 psi/ft) and leakage is mitigated through a thick, laterally-effective top seal. Structural closures in the area are generally less than the CO2 column heights necessary to breach the seal. At least eleven mapped closures are shown to link together into the proposed regional fill-and-spill “Silverpit CCS Fairway”. If filled to spill, these traps could cumulatively host up to 7.9 Gt of CO2, three times that of the proposed Endurance CCS Field. Through management of the injection and fill-spill strategy, this fairway could be future-proofed in relation to CO2 spill hazards, whilst possibly requiring less ‘injector hubs’ to fill the traps. Migration spill-point modelling along the fairway may also inform the placement of permanent, cost-effective multi-physics seabed system for leakage and migration monitoring. Exploiting fill-and-spill fairways for CCS is a new concept with vast potential applicability globally.
{"title":"A fill-and-spill CCS mega-fairway in the Southern North Sea: a new concept to optimise CO2 storage","authors":"S. Patruno, A. Green, D. Caldarella, V. Scisciani, J. Corcoran, M. Nuzzo, M. Przywara, G. Gillott","doi":"10.3997/2214-4609.202113149","DOIUrl":"https://doi.org/10.3997/2214-4609.202113149","url":null,"abstract":"Summary A potential carbon capture and storage (CCS) fill-and-spill mega-fairway is here identified in UKCS Quadrants 43-44, by combining regional wellbore data with 3D seismic interpretation and migration modelling. In the study area, the Triassic Bunter Sandstone reservoir shows consistent thicknesses (90-216 m) and prospective core-based porosities and permeabilities (11-28%, 9-669 mD). A connected reservoir is suggested regionally from consistent, near-hydrostatic aquifer pressure gradients (~0.51 psi/ft) and leakage is mitigated through a thick, laterally-effective top seal. Structural closures in the area are generally less than the CO2 column heights necessary to breach the seal. At least eleven mapped closures are shown to link together into the proposed regional fill-and-spill “Silverpit CCS Fairway”. If filled to spill, these traps could cumulatively host up to 7.9 Gt of CO2, three times that of the proposed Endurance CCS Field. Through management of the injection and fill-spill strategy, this fairway could be future-proofed in relation to CO2 spill hazards, whilst possibly requiring less ‘injector hubs’ to fill the traps. Migration spill-point modelling along the fairway may also inform the placement of permanent, cost-effective multi-physics seabed system for leakage and migration monitoring. Exploiting fill-and-spill fairways for CCS is a new concept with vast potential applicability globally.","PeriodicalId":265130,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127805350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.3997/2214-4609.202113123
D. Reust
Summary A seismic vibrator has been transformed into a powerful low frequency source by taking advantage of an underutilized asset: the carrier vehicle’s mass. At very low frequencies, a portion of vehicle mass is compliantly coupled to the reaction mass by hydraulic dampers. This increased its output force at very low frequencies by a factor of about 4 and improved its ground force waveforms as well. A revised method of estimating ground force has been implemented and verified with load cells. A small investment has made a smaller obsolete vibrator outperform the newest and best vibrators at 2 Hertz and below
{"title":"Low frequency vibrator transformation","authors":"D. Reust","doi":"10.3997/2214-4609.202113123","DOIUrl":"https://doi.org/10.3997/2214-4609.202113123","url":null,"abstract":"Summary A seismic vibrator has been transformed into a powerful low frequency source by taking advantage of an underutilized asset: the carrier vehicle’s mass. At very low frequencies, a portion of vehicle mass is compliantly coupled to the reaction mass by hydraulic dampers. This increased its output force at very low frequencies by a factor of about 4 and improved its ground force waveforms as well. A revised method of estimating ground force has been implemented and verified with load cells. A small investment has made a smaller obsolete vibrator outperform the newest and best vibrators at 2 Hertz and below","PeriodicalId":265130,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115544389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.3997/2214-4609.202113259
H. Quintero, J. González, D. Barbosa, A. Villar, A. Mouret, C. Bruchenon
Summary This experimental study got to analyze the potential effects of residual polymer concentrations on production fluids in well produced and surface treatment conditions. The results provide an approach to understand the potential polymer effects on production fluids at laboratory scale and it will be the input to working on the problem mitigation at field scale. The evaluation in producing well conditions was carried out to identifying potential impacts of the residual polymer in BS&W, particle size distribution and viscosity of the W/O emulsions. If the emulsion have significant changes in those parameters, it could affect the systems for lifting and transport of production fluids. The evaluation at surface treatment conditions focused on observing the possible effects of the polymeric residual contents on the oil dehydration and water clarification processes. The experimental tests have highlighted a potential incompatibility between the water clarifiers currently used on site and the residual polymer contained in the back produced fluids. An adaptation or a change of these products is to be studied to maintain a good produced water quality on the field in EOR context.
{"title":"Experimental evaluation of residual polymer impacts on fluids separation in Colombian field conditions","authors":"H. Quintero, J. González, D. Barbosa, A. Villar, A. Mouret, C. Bruchenon","doi":"10.3997/2214-4609.202113259","DOIUrl":"https://doi.org/10.3997/2214-4609.202113259","url":null,"abstract":"Summary This experimental study got to analyze the potential effects of residual polymer concentrations on production fluids in well produced and surface treatment conditions. The results provide an approach to understand the potential polymer effects on production fluids at laboratory scale and it will be the input to working on the problem mitigation at field scale. The evaluation in producing well conditions was carried out to identifying potential impacts of the residual polymer in BS&W, particle size distribution and viscosity of the W/O emulsions. If the emulsion have significant changes in those parameters, it could affect the systems for lifting and transport of production fluids. The evaluation at surface treatment conditions focused on observing the possible effects of the polymeric residual contents on the oil dehydration and water clarification processes. The experimental tests have highlighted a potential incompatibility between the water clarifiers currently used on site and the residual polymer contained in the back produced fluids. An adaptation or a change of these products is to be studied to maintain a good produced water quality on the field in EOR context.","PeriodicalId":265130,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114377112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.3997/2214-4609.202113171
K. Roberts, A. Laurain, Y. Albuquerque
Summary In this work we present an optimization methodology that inverts for the sharp interface of a salt body by recasting full waveform inversion as a shape optimization problem. In this framework, a shape representing the salt body can morph throughout the optimization process while preserving the model discontinuity between the salt and background sediment. We employ a distributed expression of the shape derivative instead of a boundary expression; this allows working with non-smooth domains, low regularity functions and often offers better accuracy than the boundary expression for numerical approximation. For a better resolution of these sharp interfaces, we utilize a finite element method with unstructured triangular meshes and variable mesh resolution to solve the optimization problem. All developments are available in an open-source coding package called spyro which uses the finite element library Firedrake.
{"title":"Sharp-interface imaging in full waveform inversion using finite elements","authors":"K. Roberts, A. Laurain, Y. Albuquerque","doi":"10.3997/2214-4609.202113171","DOIUrl":"https://doi.org/10.3997/2214-4609.202113171","url":null,"abstract":"Summary In this work we present an optimization methodology that inverts for the sharp interface of a salt body by recasting full waveform inversion as a shape optimization problem. In this framework, a shape representing the salt body can morph throughout the optimization process while preserving the model discontinuity between the salt and background sediment. We employ a distributed expression of the shape derivative instead of a boundary expression; this allows working with non-smooth domains, low regularity functions and often offers better accuracy than the boundary expression for numerical approximation. For a better resolution of these sharp interfaces, we utilize a finite element method with unstructured triangular meshes and variable mesh resolution to solve the optimization problem. All developments are available in an open-source coding package called spyro which uses the finite element library Firedrake.","PeriodicalId":265130,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114607817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.3997/2214-4609.202113118
S. Lauro, J. Baniamerian, E. Pettinelli, E. Mattei, B. Cosciotti
Summary Amplitude of electromagnetic (EM) waves is attenuated when propagating in a lossy medium. The attenuation which is commonly characterized by the loss tangent depends on the electromagnetic properties of the composing materials, medium structure and the nominal operating frequency of the transmitted signal. Therefore, evaluating the EM waves attenuation can give insights to the material’s constitutive parameters. Assuming a Ricker wavelet as the source wavelet, a nonlinear equation relating the frequency to two-way travel time, loss tangent and nominal frequency is derived that is then solved by probabilistic approach inversion to recover the sought model parameters. The proposed approach is applied into a real dataset acquired on Mount Etna volcano, Italy.
{"title":"A New Centroid Frequency-Based Algorithm to Estimate the Attenuation of Ground Penetrating Radar","authors":"S. Lauro, J. Baniamerian, E. Pettinelli, E. Mattei, B. Cosciotti","doi":"10.3997/2214-4609.202113118","DOIUrl":"https://doi.org/10.3997/2214-4609.202113118","url":null,"abstract":"Summary Amplitude of electromagnetic (EM) waves is attenuated when propagating in a lossy medium. The attenuation which is commonly characterized by the loss tangent depends on the electromagnetic properties of the composing materials, medium structure and the nominal operating frequency of the transmitted signal. Therefore, evaluating the EM waves attenuation can give insights to the material’s constitutive parameters. Assuming a Ricker wavelet as the source wavelet, a nonlinear equation relating the frequency to two-way travel time, loss tangent and nominal frequency is derived that is then solved by probabilistic approach inversion to recover the sought model parameters. The proposed approach is applied into a real dataset acquired on Mount Etna volcano, Italy.","PeriodicalId":265130,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124967316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.3997/2214-4609.202113164
H. Masoomzadeh, M. Romanenko
Summary Internal multiples contaminate weak primary reflection signals received from sub-basalt interfaces. We compare two methods of predicting internal multiples in seismic lines acquired in the Norwegian Sea. We compare a wave-equation based method that respects the structure but predicts only a subset of internal multiples corresponding to a downward bounce at the sea bottom, against a fast approximation which relies on a flat-earth assumption but predicts internal multiples generated at many subsurface boundaries all at once. The latter approach provides a better result by making a more realistic estimation of amplitudes, while compromising the accuracy of temporal dynamics.
{"title":"Internal multiple elimination in the Vøring Basin: a comparison of two approaches","authors":"H. Masoomzadeh, M. Romanenko","doi":"10.3997/2214-4609.202113164","DOIUrl":"https://doi.org/10.3997/2214-4609.202113164","url":null,"abstract":"Summary Internal multiples contaminate weak primary reflection signals received from sub-basalt interfaces. We compare two methods of predicting internal multiples in seismic lines acquired in the Norwegian Sea. We compare a wave-equation based method that respects the structure but predicts only a subset of internal multiples corresponding to a downward bounce at the sea bottom, against a fast approximation which relies on a flat-earth assumption but predicts internal multiples generated at many subsurface boundaries all at once. The latter approach provides a better result by making a more realistic estimation of amplitudes, while compromising the accuracy of temporal dynamics.","PeriodicalId":265130,"journal":{"name":"82nd EAGE Annual Conference & Exhibition","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122118113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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