... Dispersion curve inversion is a key step in obtaining the acoustic velocity of formations around wells and information evaluation. Traditional dispersion inversion methods, based on wellbore sound propagation theory, suffer from low efficiency and multimodality issues. Methods based on deep...

... characterization applied geoscience & energy 10 wave-equation ambient noise tomography geology geomechanics tomography inversion exploration geophysicist hz band case study giuseppe provenzano summary geological subdiscipline brossier traveltime tomography landslide dispersion curve american...

... reservoir characterization anisotropy exploration geophysicist trade-off dispersion curve About the importance of the horizontal components of the wavefield for a well-constrained velocity inversion: 3-C versus 1-C inversions Isabelle Dumont, Sophie Beauprêtre, Anaïs Lavou Dan Hollis, Chloé Gradon...

... of conventional methods to obtain accurate dispersion curves and reconstruct the surface wave model. Then, it is adaptively subtracted from the original seismic data to achieve more accurate surface wave suppression, thereby improving the shallow signal-to-noise ratio of seismic data. To provide a near surface...

... velocity poisson apparent poisson wavelength dispersion curve geologist geological subdiscipline p-wave velocity inversion applied geoscience & energy 10 objective function reservoir characterization s-wave velocity average velocity analysis method american association P-wave Velocity...

... dispersion curve. Finally, a high-precision velocity model in the entire computational domain is established through model merging, and the imaging accuracy of complex structures is greatly improved through prestack depth migration processing, providing an effective approach to seismic imaging quality...

... relations of the formation right beneath a receiver. Our numerical modeling results demonstrate that this approach is applicable to heterogeneous models and can image small-scale surface anomalies with very high lateral resolution. applied geoscience imaging love wave dispersion curve frequency...

... fault in the area. The virtual shot gathers are, then, inverted to generate the 1D near-surface shear-wave model. frequency shot gather interferometry inversion upstream oil & gas thickness virtual csg dispersion curve reservoir characterization applied geoscience hanafy exploration...

... Estimation of near-surface shear wave velocity from the surface waves (Rayleigh and Love) dispersion curve has been a routine analysis for decades in civil and environmental engineering. Robust and accurate forward simulation of dispersion curve is critical in the Rayleigh wave dispersion...

.... As Rayleigh wave is generally the dominant signal in surface seismic data, the proposed method is established based on the derivation of Rayleigh wave dispersion from single station 6C data. A subsurface velocity model can be immediately constructed by consolidating the dispersion curves derived from...

... joint estimation of VS and transversely isotropic parameters, which can provide near surface anisotropy for different applications. applied geoscience love-wave phase velocity receiver component dispersion curve anisotropic multimode elastic anisotropy shot gather inversion result...

... inversion approaches only utilize the fundamental mode. However, putting this generally leads to damaging trade-offs in the resulting inferred models. We observe that surface DAS data, with its wide frequency range, makes multimodal dispersion curve picking much more straightforward, opening up...

...-wave velocity model can be obtained from its group or phase velocity dispersion curve. The applicability of this method is demonstrated with the data from a 2-m thick coal seam from the Rydułtowy mine, Poland. Derived quasi 2D S-wave velocity profile strongly correlates with the mechanical quality...

... consists of two components: dispersion curve picking using a machine learning (ML)-based method and dispersion curve inversion. The method is shown to be robust and it is believed to be a good candidate for an early stage of an elastic model building workflow when Scholte waves are observed. upstream...

... impact makes this imaging method particularly suitable for large cover-mapping surveys. upstream oil & gas seismic noise velocity model inversion reservoir characterization thickness metals & mining velocity layer variation application bedrock dispersion curve applied geoscience...

... Multi-mode dispersion curve picking is required by many approaches for shallow-subsurface characterization using surface waves, but is typically a labor-intensive process. Previously we automated the picking procedure using convolutional neural network (CNN) based machine learning (ML) method...

... Extraction of the dispersion curves is an important step in surface wave imaging of subsurface shear wave velocity distribution. Accurate extraction of the dispersion curve is crucial for the precision of the inverted velocity, but this step requires experience and is time consuming. Therefore...

... area exploration geophysicist 10 reservoir characterization investigation area san leandro upstream oil & gas microtremor measurement francisco bay area peak frequency hayward fault velocity model dispersion curve coyote hill northeast side east san francisco bay area microtremor...

... effect on the dispersion curves than the tilt. The relative direction between dipole and eccentered directions affects the dispersion curves. S-wave velocity in LWD can be estimated stably in a screw mode even for the tool eccentered/tilted in the borehole. Finally, the effect of the eccentricity...

... exploration geophysicist 10 imaging method upstream oil & gas multichannel analysis energy peak dispersion spectra microtremor assumption seg international exposition louie surface wave geophysics dispersion curve passive surface wave receiver array Comparisons between non-interferometric...