... parameter slowness vertical velocity local anisotropy estimation vertical seismic profile machine learning feasibility das vsp annual meeting horizontal slowness travel time slowness component Gaiser , J. E. , 1990 , Transversely isotropic phase velocity analysis from slowness...

... of estimating layered VTI velocity models suitable to accurately locate microseismic events during a hydraulic stimulation in the VacaMuerta shale formation. Presentation Date: Wednesday, October 17, 2018 Start Time: 9:20:00 AM Location: Poster Station 15 Presentation Type: Poster vertical velocity...

... on a regularization of the objective function and a specific parameterization of an acoustic Transversely Isotropic (TI) medium consisting of the vertical velocity, and Thomsen parameters epsilon and delta. We show, by using synthetic data, that Total Variation (TV) regularization significantly reduces leakage...

... sensitivity kernel semblance vti media angle image gather vti sensitivity kernel isotropic media sensitivity kernel-based tomography media depth residual kernel vertical velocity image point upstream oil & gas rtm angle image gather velocity model tomography reservoir...

... gain in the coarse-grain method. The efficiency of the coarse-grain method 2 is less than the coarse-grain method 1 again because of more memory access, as we compare (19) and (18). Figures 2-4 show the comparison of the vertical velocities for normal and coarse-grain 1 implementation recorded...

.... The parameters should be reliably recon- structed from the surface data with limited trade-off. Gholami et al. (2013) suggest a parametrization using a vertical velocity (VP0), a horizontal velocity (Vh), and the Thompsen parame- ter (Thomsen, 1986) for wide aperture acquisition geome- tries. The horizontal...

... azimuth distribution as shown in Figure 1b. waz obc data vertical velocity reservoir characterization cig gather upstream oil & gas curvature orthorhombic model anisotropy isotropic model azimuth imaging velocity model building event continuity orthorhombic velocity model building...

.... Introduction Seismic anisotropy (Thomsen, 1986) plays a key role in exploration seismology. In industry applications of FWI it is still common practice to update for vertical velocity only, while keeping the anisotropic parameters fixed during the inversion (see for example, Warner et al., 2013...

... Summary Most shale reservoirs are described assuming transverse isotropy (TI) elasticity. A full characterization for such reservoirs requires the knowledge of density, P- and S-wave vertical velocities, and the three anisotropic Thomsen parameters ?, e, d and . Of the three Thomsen...

... an image obtained from one azimuth to constrain the image-space velocity anal- ysis on other azimuths. This method directly tackles the dif- ferences in anisotropic parameters among different azimuths. By keeping the vertical velocity constant across the azimuths, we separate the kinematic effects due...

... fracture gassmann seg houston 2013 isotropic rock water saturation synthetic sandstone model gurevich bulk modulus porosity fluid substitution hti medium schoenberg equation vertical velocity geophysics saturation reservoir characterization Fluid substitution for an HTI medium Long Huang...

.... Specifically, the scattering equations are used to get the travel- time sensitivity kernels for the parameter, NMO velocity and vertical velocity. Cross-correlation and unwrapped phase are used to compare the two approaches for WET. We start with a simple homogeneous model to show the properties of the ker...

... SUMMARY In this paper I introduce two different model-space parametrizations for early-arrival waveform inversion of velocity and anisotropic parameter. More specifically, I jointly invert for vertical velocity and e parameter, while keeping the d parameter fixed. A model space parametrized...

... offsets. The method is applied to field data, showing how this approach can obtain a good anisotropic focusing velocity if the data contains sufficiently large offsets, although still one or more wells are needed to constrain vertical velocity. residual moveout velocity analysis nicola bienati...

... coefficients, and can be measured in the lab. Figure 1: Anisotropic model used in this study in terms of (a) Vertical Vp, (b) and (c) Synthetic forward modeling Figure 1 shows our anisotropic model in terms of vertical velocity (Vp), and Thomsen s parameters and (Thomsen, 1986). The model consists...

... (multiples with two reflections: from the boundary and free surface) for estimation of a layered depth velocity model above the borehole receiver array. A three-term NMO approximation function is used to estimate NMO velocity and a non-hyperbolic parameter. Assuming that the interval vertical velocity...

... retrieves a ve- locity closer to the NMO velocity than to the vertical velocity. Similar comments have been made with traveltime inversion. FWI is carried out with a quasi-Newton method that requires the gradient of the misfit functional. The least-squares misfit functional is, with d the observed data...

... with checkshots. workflow seg seg denver 2010 well location tomography inversion vertical velocity reservoir characterization initial model seismic image depth interpolation anisotropic model geologically plausible anisotropic depth model upstream oil & gas thomsen parameter anisotropy...

...-elliptic parameter predomi- nantly influence imaging (Alkhalifah and Tsvankin, 1995; Alkhal- ifah et al., 2001). Vertical velocity (vz) controls mainly place- ment of the image in depth. Nevertheless, estimating even two parameters that can vary laterally and vertically from image gathers is difficult...

... constraints. As a result we recover the anisotropic velocity field around the well. We present a synthetic data example of anisotropic tomography applied to a 1D VTI model. We demonstrate three different cases of introducing additional information. In the first case vertical velocity is known and tomography...