... to cracks is difficult because many other parameters affect the wavespeed. We model how nonlinear wave interactions can be used to separate the effects of cracks. Specifically, we model how sensitive nonlinear wave interactions are to crack orientation with a particular focus on sets of randomly oriented...

... ABSTRACT We successfully adapted and applied principles from elastography and harmonic imaging from diagnostic ultrasound imaging to estimating elastic nonlinearity parameters in rocks, which are sensitive to pore structure changes and fluid content variations. Because diseased tissue has very...

... ABSTRACT We show the nonlinear interactions of P- and S-waves numerically, complementing the existing theoretical and experimental works. In agreement with experimental studies, we show that the nonlinear interaction of P- and S-waves is largest when the particle motion is aligned...

... Summary In standard seismic full waveform inversion updates (e.g., of Gauss- Newton type) small angle, backscattered amplitudes are incorporated linearly. Making an effort to include nonlinearity in each update may be useful, however, both for estimation of difficult-to-discriminate...

... SUMMARY The nonlinearity of the seismic amplitude-variation-with-offset (AVO) response in the presence of large relative changes in acoustic and elastic medium properties is investigated with physical modelling data. A procedure for pre-processing reflection data, acquired using the CREWES...

... upstream oil & gas reservoir characterization phillips seismic vibrator standard control vibrator reduction inova geophysical equipment salla nonlinearity vibroseis source signature low frequency frequency-time plot harmonic distortion weighted-sum ground force nonlinear control hdr...

... hyperbolic gamma from depth-migrated common image gathers and adjusting the velocity model accordingly, an efficient step that can significantly reduce the nonlinearity in the inversion problem, 2) employing ray-based tomography, an industry-workhorse which is routinely used to construct a low-frequency...

... ABSTRACT Accurate modeling of processes associated with the geophysical monitoring of fluid flow commonly leads to coupled systems of nonlinear equations. Using an asymptotic technique, valid for a medium with smoothly-varying heterogeneity, one can derive an expression for the slowness...

... – connected to each digitizer. In conventional systems the amplitude, phase, and nonlinear properties of the analog front end (AFE) – i.e. amplifier, analog filters, analog-todigital converter, and others – are tested using a test signal generator. The electronic noise is tested by connecting a reference...

...-based reservoir characterisation approach (SBRC). Due to vanishing pore pressure perturbations locally, the diffusivity at the triggering front is equal to the initial diffusivity of the medium regardless whether the process of pore pressure diffusion is linear or nonlinear. Behind the triggering front...

... for nonlinearities in the velocity to pore pressure transform and spatial correlation between the different input variables. The linearized and stochastic approaches are compared in the context of a seismic pore pressure prediction study involving overpressured reservoir sands. upstream oil & gas...

... ABSTRACT No preview is available for this paper. p-wave anisotropy nonlinear elasticity relative variation murnaghan coefficient stress-induced anisotropy s-wave birefringence approximation anisotropy perpendicular fontainebleau sandstone propagation pyrex upstream oil...

... ABSTRACT No preview is available for this paper. seismic emission nikolaev upstream oil & gas physics reservoir characterization ashkhabad seismic activity institute deformation nontraditional method nonlinear property nonlinearity seismic noise temporal variation...

... ABSTRACT No preview is available for this paper. total ambiguity nonlinearity velocity-depth ambiguity interval velocity determinant experiment reservoir characterization geophysics bickel traveltime measurement ambiguity velocity variation equation variation noise...

... equation geophone frequency range nonlinearity Seismic 15 -W- Corfu Profile III: Final Model I PAXOS I I RIDGE ! PU 473 -EE LAYERPI fp=5.9 I !I LAYER TUf Vp 6.3? - I 0 II 2 .I I I 6 I ..I 8 1 I 10 12 I 14 16 16 Distance in KM I 20 22 I r., .I. 24 26 I .n t J 26 30 32 FIG. 4. Composite seismic...