... analysis in seismic processing to improve the image quality and to estimate the anisotropic model parameters. Using azimuthal residual moveout analysis, the direction of azimuthal anisotropy in the reservoir was predicted, and it was found that the results are consistent with fracture orientations obtained...

...Yanis Saadallah; Arild Buland ABSTRACT Residual moveout (RMO) can have a severe impact on seismic amplitude-variation-with-offset (AVO) analysis. It is, therefore, common practice to quality control and correct the processed seismic data for RMO before AVO analysis. However, a complicating factor...

... have encountered a lower velocity than the primaries, and thus multiples are expected to exhibit an increasing residual moveout (RMO) along the offset dimension. Although suffering from their own set of limitations, separation-based methods are of a computationally simpler nature and can be applied...

... that waveform moveouts are clearly visible, and that the standard deviation of the audio recordings is a straightforward yet promising metric that could help quantify burst damage. Although improvements are needed before mines can routinely use this monitoring strategy, DAS‐based seismoacoustic arrays may...

..., thus extending the approximation of residual moveout correction inherent in traditional velocity model building approaches. Moreover, FWI is capable of inverting information from the entire wavefield (i.e., early arrivals, reflections, refractions, and multiple energy) rather than from a subset...

... with the generalized moveout approximation (GMA) for P and S waves is applied in numerical examples. We find that our proposed approximation indicates higher accuracy than the GMA counterpart for P and S waves. The error sensitivity of P and S waves in the depth, vertical velocity ratio, and the anellipticity...

...Chao Ding; Jianwei Ma ABSTRACT Migration velocity analysis is a crucial seismic processing step that aims to translate residual moveout (RMO) in common-image gathers (CIGs) into velocity updates. However, this is often an iterative process that requires migration and significant human effort...

...Song Jin; Alexey Stovas; Xiangyun Hu ABSTRACT Reflection moveout approximations written as explicit functions of offset are convenient tools commonly applied in seismic data modeling, processing, and inversion. The generalized moveout approximation (GMA) has a flexible functional form...

... estimation via analysis of converted-wave moveout and tomography is still immature. We derive a general residual moveout (RMO) relation as a function of incident angle or as a reflection angle for converted waves, which can be used for converted-wave tomography based on angle-domain common-image gathers. Our...

... as residual moveout (RMO) effects induced by erroneous velocity models. Surface-offset extensions have proven to be a robust alternative to angle gathers as well as subsurface extensions when applied to narrow-azimuth data acquisitions, especially when using erroneous velocity models. As such, least-squares...

... axis. Our approximation for traveltime is a modified version of the extended generalized moveout approximation that comprises six parameters. Our direct approximations for the ray parameter and curvature use new algebraically simple equations with three parameters. We define these parameters for each...

... accordingly to achieve better signal alignment before stacking. Specifically, we have developed a 2.5D MF reflection traveltime equation that explicitly takes into account the midpoint dispersion and cross-dip effects. The new formulation corrects for normal, inline, and crossline dip moveouts (DMOs...

... ) . Next, the rank-reduced matrix L ( f ) can be calculated by extracting the first L principal components, that is, L ( f ) = ∑ i = 1 L σ i u i v i T . (5) The first field example (Figure  9 ) is a stacked data set after applying dip-moveout...

... at Brady Hot Springs, Nevada, USA. Although this data set was acquired with the original intent of monitoring changes in a geothermal reservoir, it is shown that the data can also be used to identify and monitor vehicle movements on a nearby highway. Analysis of moveout patterns and recorded amplitudes...

...Luke Decker; Qunshan Zhang ABSTRACT We have developed a novel application of dynamic time warping (DTW) for correcting residual moveout in image gathers, enhancing seismic images, and determining azimuthal anisotropic orientation and relative intensity when moveout is caused by wave propagation...

...Véronique Farra; Ivan Pšenčík ABSTRACT We present an approximate nonhyperbolic P-wave moveout formula applicable to horizontally layered media of moderate or weak anisotropy of arbitrary symmetry and orientation. Anisotropy symmetry and its orientation may differ from layer to layer. Instead...

...Yanadet Sripanich; Sergey Fomel; Jeannot Trampert; William Burnett; Thomas Hess ABSTRACT Parameter estimation from reflection moveout analysis represents one of the most fundamental problems in subsurface model building. We have developed an efficient moveout inversion method based on the process...

... phase velocity equation is readily calculated, there is not an explicit equation for the exact group velocity as a function of group angle nor for the traveltime as a function of offset. Accordingly, we have developed new approximate phase velocity, group velocity, and moveout equations for acoustic...

...Shibo Xu; Alexey Stovas ABSTRACT The moveout approximations are commonly used in seismic data processing such as velocity analysis, modeling, and time migration. The anisotropic effect is very obvious for a converted wave when estimating the physical and processing parameters from the real data...