... Velocity model building is an essential step in seismic exploration, which runs through the whole process of seismic data acquisition, processing, and interpretation. The velocity information is conventionally obtained by iterative optimization methods such as full-waveform inversion...

... settings within the area covered by the surface seismic surveys. Large aperture 3-component (3C) borehole geophone arrays and both P-wave and S-wave vibrator sources were utilized, providing valuable time-depth and velocity information. In addition to the travel time information, high-resolution VSP...

... velocity information without the need of acquiring ocean bottom seismometer data. The diffraction based processing uses a multiparameter stacking operator which naturally enhances diffractions and at the same time generate kinematic wavefield attributes. These attributes together with the stack serve...

... tomography solution. The JARR method provided accurate near-surface velocity information. A post-stack Stolt (FK) migration was applied to the data using the JARR method calculated near-surface velocities. The results show that the JARR method provided accurate near-surface velocities suitable for FK...

... demonstrate that pure time/amplitude warping without background velocity information can produce quantitative relative velocity changes for time-lapse applications. Our warping method uses total variation norms for regularization, and piecewise linear basis functions for the time warping function. Although...

... ABSTRACT We propose an image-domain velocity model building method using the two-way wave equation and extended seismic images. We show that common-image-point gathers can effectively extract velocity information from steep reflections imaged with the two-way wave propagator. Such gathers have...

... into the computation of the semblance functional that estimates image coherency. The resulting velocity estimator provides velocity estimates that are: 1) unbiased by reflector curvature, and 2) consistent with the velocity information that we routinely obtain by measuring coherency over aperture/azimuth angles...

... a challenging exploration environment in resource rich areas like the Gulf of Mexico, deepwater Angola or offshore Brazil. Velocity information derived from sub-salt seismic data itself can be inaccurate and of low resolution. The quality and validity of any interpretation in such a setting highly depends...

... migration (PSDM) we integrated all available sources of velocity and geological information. We used the subweathering velocity models derived from refraction statics analysis together with constant velocity migrations for velocity information in the shallow section. The locations of velocity pull-ups...

... SUMMARY A reliable and clear depth image requires accurate near-surface velocity information. Such valuable data are usually expensive to obtain from an uphole program. Here, we show that a fairly accurate model of the shallow subsurface can be obtained from high-resolution seismic data. Using...

... geometries are used for ray tracing to preserve azimuthal information during the tomographic inversion. Multi-scale tomography is used to improve the ray coverage and to help the inversion converge to the global minimum without losing detailed velocity information. geophysics workflow ray path...

... a prestack migrated image, a limited number of independent experiments that contain all the velocity information needed for MVA. The basic element of the method is the modeling of one isolated Subsurface-Offset Domain Common Image Gather (SODCIG) by using the prestack image as an initial condition. Taking...

... ABSTRACT We propose a method for estimating interval velocity using kinematic information in diffractions. We extract velocity information after migration by analyzing residual diffraction focusing in physical space using prestack residual migration. We invert for interval velocity using...

... interactive horizontal algorithm san antonio non-vertical velocity analysis algorithm velocity information non-vertical algorithm option velocity model upstream oil & gas information vertical velocity analysis constraint analysis algorithm pore pressure information seg int velocity analysis...

... Abstract In performing explicit finite-difference prestack depth imaging on Alberta Foothills structures, we compared several prestack and poststack migrations. The results from the Shaw-Basing data set demonstrated that, due to the lack of near-surface velocity information, prestack depth...

... velocity model cmp gather reservoir characterization accuracy velocity information interval velocity Building Velocity Model for PreSDMa non-iterative Strategy Zhang, C., East China University of Petroleum, China. Summary: Traveltimes of seismic waves are completely determined by subsurface...

... velocity alba field lithological insight true geological variation velocity estimate velocity information lithology A lithological insight from seismic velocities: an example from the Central North Sea Campbell, A. G.* & Waltham, D. Dept. of Geology, Royal Holloway (University of London) Summary...

... ABSTRACT No preview is available for this paper. information time-to-depth conversion reservoir characterization seismic velocity spatial velocity analysis migration velocity information upstream oil & gas interval velocity data integration velocity map factorial...

.... Velocity information can be derived from seismic data in two different ways, both of which are used in the current work: from the moveout relation (low frequency) and from seismic amplitudes (high frequency). In the low frequency stage, the interval velocities are obtained at closely spaced CDP locations...

... ABSTRACT No preview is available for this paper. assoc mtg model building deregowski velocity information limitation correction reliability doicin geophy residual depth error europ upstream oil & gas audebert crp gather migration internat reservoir characterization...