... reflection data inversion seismogram Ultra-low frequency AVA analysis of plane-wave primary reflection seismograms Lasse Amundsen*, Equinor Summary An amplitude versus angle (AVA) method is presented for estimating density and velocities of a stratified elastic medium. The seismograms are multiple-free...

... prone to the cycle-skipping problem. Therefore, to facilitate the practical application of reflection data in velocity reconstruction, we design a two-stage workflow, in which reflection traveltime inversion (RTI) and RWI are cascaded and solved using the truncated Gauss-Newton method to obtain...

... We present a stochastic inversion procedure for surface-based common-offset ground-penetrating radar (GPR) reflection data. The method is based on simulated annealing (SA) and conditioned to borehole information available along the GPR profile. Application to synthetic and field data indicates...

... ABSTRACT Reflection-waveform inversion (RWI) utilizes reflection data to recover the background velocity. Due to the limited apertures of reflection data illuminating targets, and the trade-off between the depth of reflectors and the average velocity above the reflectors, RWI is inherently ill...

... amplitude noise annual meeting essential step sdc workflow facies trim static application gradient seismic data conditioning well synthetic reflection data data conditioning upstream oil & gas facies prediction variation References References Chopra , S. , and J...

... inversion upstream oil & gas log-validated waveform inversion full waveform inversion reflection data workflow 1 seismic data reflectivity shot record reservoir characterization amplitude modelled shot record margrave migration References References Bleibinhaus , F. , J...

... ABSTRACT Reflection full-waveform inversion (RFWI) is a wave equation based model building approach that utilizes reflection data and can update deeper parts of a velocity model not accessible by diving waves of standard FWI. In this paper, we propose an efficient RFWI workflow that uses full...

... denote reflection response artifact function retrieval marchenko equation reflection data reflection References References da Costa Filho , C. A. , M. , Ravasi , A. , Curtis , and G. A. , Meles , 2014 , Elastodynamic Green’s function retrieval through single-sided...

... estimates from these virtual responses. The prestack multiples are adaptively subtracted from the original reflection data, and then images are created. We provide detailed comparisons between the image obtained from the multiples-attenuated image, the migrated original dataset, and an image obtained...

... ABSTRACT Although, with the usual seismic acquisition, much of the information about subsurface parameters is contained in the reflections data, many of the current Full Waveform Inversion applications still focus on the use of the transmitted energy (i.e. refractions). In order to reduce...

... : Geophysics , 78 , no . 6 , R223 – R233 , 10.1190/geo2013-0004.1 . Tarantola , A. , 1984 , Inversion of seismic reflection data in the acoustic approximation : Geophysics , 49 , 1259 – 1266 , 10.1190/1.1441754 . Xu , S. , D. Wang , F. Chen , G...

... reflector artificial intelligence optimization problem yang optimal-transport fwi yunan yang reflection waveform inversion optimal transport four-layer model wasserstein metric reflection data initial model upstream oil & gas iteration seg international exposition velocity model...

... We investigate the benefits of improving the quantitative estimation of reflectivity in reflection FWI (RFWI). This is an important step of the inversion process, since it not only affects the generation of the synthetic reflection data, but also the generation of the "rabbit ears" along...

... ABSTRACT We present a Reflection FWI (RFWI) workflow to update the velocity model using the low-wavenumber component of the FWI gradient of reflection data. This is achieved by alternately using high-wavenumber and low-wavenumber components to update density and velocity models, respectively...

... the coherence of the reflection energy and minimizing the misfit between model arrival times and the recorded first arrival times. This approach can alleviate inherent limitations in shallow refraction data by using coherent reflection data. Presentation Date: Thursday, September 28, 2017 Start Time: 8:30 AM...

... approximate inverse operator seg seg international exposition true amplitude imaging interpolation velocity model seismic data inverse operator original data migration reservoir characterization geophysics reflection data modeling operator operator iteration upstream oil & gas incomplete...

... are updated simultaneously. The algorithm is applied to multicomponent reflection data generated for a modified section of the BP TI model. The inversion significantly reduces the data misfit and recovers the long-wavelength components of the attenuation parameters, especially in the upper part of the section...

... ABSTRACT A modified implementation of Marchenko redatuming leads to a filter that removes internal multiples from reflection data. It produces local reflectivity at two-way travel time. The method creates new primary reflections resulting from emitted events that eliminate internal multiples...

... ABSTRACT The Green’s theorem wave-separation methods (e.g., separating the reference wave and the reflection data, and deghosting) have an important property of naturally accommodating an arbitrary measurement surface. However, for non-horizontal acquisition, those methods cannot locate...

... ABSTRACT Band limitation of seismic reflection data leads to a nonunique estimate of the acoustic impedance profile; and thus, hinders the direct interpretation of observed data in terms of rock properties. The prevalent inversion methods counter the nonuniqueness either by stabilizing...