.... In this study, we introduce a robust FWI approach that leverages PS converted waves to update shear velocity using single-mode propagators. Despite a slight reduction in accuracy, we successfully simulate PS converted waves by solving an approximated S-wave equation. By employing different imaging conditions...

...Waveform Inversion for Shear Velocity and Attenuation via the Spectral-Element Adjoint Method Fan V. Wu, Dmitry Borisov*1,2, Frederik J. Simons1, and Paul Williamson3 1Princeton University, 2Kansas Geological Survey, 3Total EP Research and Technology SUMMARY METHOD Intrinsic attenuation affects...

...). compressional velocities when hydrates formed; however, the same was not observed for shear velocities. The water TOP film around these hydrates could be an explanation for this response, as seen in Sahoo et al. (2018). Below 0 ºC, the E1 velocities were even higher due to the addition of ice formation...

... 16, 2019 Session Start Time: 1:50 PM Presentation Time: 3:05 PM Location: Poster Station 4 Presentation Type: Poster slow flexural wave velocity shear velocity borehole log analysis isotropic model low frequency well logging reservoir characterization anisotropy azimuth anisotropy...

... waveform compressional upstream oil & gas tang shear velocity stc slowness measurement slow formation well logging slowness quadrupole lwd formation shear slowness stoneley wave monopole data shear wave sonic log seg international exposition quadrupole data log analysis...

...% porosity, 4% anisotropic) and a fractured model (24% porosity, 26% anisotropic) with penny-shaped horizontal inclusions. When the dry solid model was saturated with the above fluids, compressional velocity increased by 11%–17% while the shear velocity showed a small decrease 1%–2% in all directions...

... of unipole acoustic logging tools and their relevance to dipole and quadrupole tools for slow formations : SPE Annual Technical Conference . characteristic orientation shear velocity dipole seg international exposition log analysis eccentric tool quadrupole wang unipole sonic lwd...

... receiver vsp data fiber-optic vsp data wavelet leaney modeling shear velocity Bettinelli , P. , and B. Frignet , 2015 , 1D anisotropic velocity model inversion from multi-offset VSP data sets (conventional array and optical cable) : 3rd EAGE Workshop on Borehole Geophysics...

... with proppant, the density of model P increased to 0.822 g/cc and porosity decreased to 21%. We observed approximately 10% reduction in both P and S velocities from model A to model P. We observed 40% increase in P-wave velocity when model A saturated with water and proppant. Shear velocity further decreased...

... elastic propagation kernel for the adjoint that we use for forward elastic modeling. We further derive inversion equations suitable for recovery of p-wave and shear velocities in fixed inhomogeneous density media with fixed inhomogeneous anisotropic coefficients, through the use of a chain rule...

... to in-situ conditions in a laboratory environment. Specifically, compressional and shear velocities are measured in 0°, 45°, and 90° orientation to bedding plane of the particular shale sample. In previous studies, these measurements were accomplished using three-plug-method, which would require to core...

..., laboratory measurements of the P- and S-wave velocities are conducted on a single bitumen-hosted dolomite sample from the Grosmont formation of Alberta, Canada. Compressional and shear velocities are estimated using the Pulse-Transmission method while studying the effects of confining and pore pressure...

... simultaneous joint tomographic inversion method can be successfully used. We also demonstrate a novel use of PP-PS event registration and high resolution tomographic update to resolve previously unconstrained shallow variations in the shear velocity model. The resultant earth models are geologically...

... and S velocities would be easier if the collar is made of an advanced composite material that has high compressional and shear velocities and density. This is a direct and easy change to implement and a new idea for an acoustic LWD tool design. Introduction Drill collars occupy most of the space...

... model shear velocity log analysis velocity estimation upstream oil & gas tight reservoir pu wang seg denver 2014 A new rock physics model for tight reservoirs Pu Wang, Guochen Wu, Ronghuo Dai, and Wenxiang Zhang, China University of Petroleum (East China) Summary Recently the exploration...

... a better estimate of the long-wavelength static than does the group-velocity inversion. surface wave dispersion curve static solution shear velocity inversion reservoir characterization phase-velocity method eikonal tomography gxt imaging solution tomography initial model phase-velocity...

... ABSTRACT We present the theory of Love wave inversion for shear velocity profiles using phase velocity, group velocity, and shear stress ratio measurements. This theory can be used to setup practical inversion schemes to estimate the near-surface velocity structure in the Earth. The method...

... a variety of formation heterogeneities. Radial variations of the formation shear velocity can be expressed in terms of a parametric exponential profile. Consequently, estimation of these parameters in the assumed profile yields the radial variation of the formation shear slowness away from the casing...

... upstream oil & gas prestack inversion key well inversion poisson ratio anomaly reservoir characterization wavelet compressional velocity inversion result stack inversion angle stack inversion prestack waveform inversion seg seg denver 2010 impedance shear velocity migrated...

...Asymmetric source acoustic LWD for improved formation shear velocity estimation Tianrun Chen, Bing Wang, Zhenya Zhu and Dan Burns, Earth Research Laboratory, Department of Earth, Atmo- spheric and Planetary Sciences, MIT SUMMARY Most acoustic logging while drilling (LWD) tools generate a single...