... Due to the influence of fault shadow, there are some false appearances in time domain such as “pull-up” or “pull-down” of seismic events in the footwall of the fault, which lead to the seismic event can’t reflect the true structural occurrence. In particular, the “pull-up” of seismic events...

... Time-domain inversion employs frequencies from a finite frequency-band wavelet to propagate seismic waves via a numerical approach. However, the classical time-domain FWI has been confined by the magnitude distribution of each frequency in a wavelet, resulting in an apparent “wavelet effect...

... deformation caused by the depth-time transformation in the time domain after the depth migration, it is especially necessary to carry out the interpretation work in the depth domain. In this paper, the research work on designing well depth prediction in low-profile structural is carried out, and the well...

... ABSTRACT In this study, we develop a time-domain FWI workflow without low-frequency information. The proposed FWI workflow combines sparse deconvolution and time domain radient-based time-shifting multiscale method. First, we extract the subsurface reflection impulse responses (SRIR...

... alternative encoding strategies to the conventional polarity encoding in time domain: In the first, we encode each shot applying a random static shift; In the second, we encode each shot applying a random phase rotation of the seismic wavefield. The velocity updates are carried out with the restarted L-BFGS...

.... In this paper, we propose an alternative approach to seismic inversion that delivers the desired output impedance and other products directly in the depth domain, whilst acknowledging wavelet non-stationarity in depth and performing the seismic misfit analysis ‘on the fly’ in the Time domain. Presentation Date...

... ABSTRACT We address the estimation of the impulse response at a reflector by deconvolving the up- and downgoing waves. Deconvolution in the time domain can be written as a linear system with multiple right-hand sides in the frequency domain. A straightforward way of solving these systems...

... ABSTRACT Time-Domain Electromagnetic (TDEM) soundings are widely used exploration geophysics method for mapping subsurface resources. TDEM is a relatively low cost, rapid, and noninvasive reconnaissance tool to locate potential water resources. TDEM method is well suited to near-surface...

..., and then induce a new expression of the sponge boundary condition. The new expression includes a frequency in the damping term even for time-domain modeling. This implies that it is difficult to apply the new sponge boundary condition in the time domain, because seismic waves generally have a range of frequencies...

... the data from depth domain to time domain before seismic interpretation. In this research, we interpret directly in depth domain, solve the well-to-seismic calibration problem in depth domain, and establish a interpretation process in depth domain. We apply this process in an oilfield with low amplitude...

... the reservoir distribution more intuitively and reliably than the result in time domain. Since the reflectivity method is much inefficient, we adopted the OpenMP parallel technology in order to make it better meet to the production needs, and the test shows that the acceleration effect is obvious. Finally...

... time domain annual meeting frequency domain waveform classification reservoir characterization seg international exposition biniv oil layer group velocity model ABSTRACT Conventional waveform clustering may be accomplished using single attribute and constant time window. To meet...

... types of noise, we estimate and evaluate the Q value in terms of compensation effects along with imaging resolution and noise level. The interval Q model in time domain can be obtained by a type of interpolation algorithm constrained by geological interfaces, which can be used as the input for time...

... decomposition in anisotropic media. Rather than decomposing elastic wavefields in the time domain into vector qP and qS wavefields for each time step, we conduct the wavefield decomposition in the frequency domain for a few given frequencies. In general, the number of selected frequencies is much smaller than...

... depth domain constraint velocity model trajectory high precision time-depth projection method well trajectory geological structure tvd time-depth relationship seg international exposition upstream oil & gas complex terrain condition reservoir characterization time domain...

... ABSTRACT The response of an inclined time domain electromagnetic (TEM) system over a layered earth is derived and studied both in the marine and land environments. On land, only horizontal current flow can be induced in a layered subsurface, regardless of transmitter orientation. In the marine...

... ABSTRACT Seismic wavefield simulation with the presence of rough surface topography provides important information for characterizing seismic wavefield simulation. Numerous researches have been carried out in the time domain. Compared with the time-domain seismic wavefield simulation...

... ABSTRACT In this study, we develop a gradient-based multiscale method in the time domain. Our time-shift method provides a natural and efficient way to realize multiscale inversion. Data preprocessing is not needed; instead, a time-shift cross-correlation is performed multiple times to extract...

... ABSTRACT We propose to estimate velocity and seismic quality factor () by using a time-domain viscoacoustic full waveform inversion (FWI) method. A newly developed fractional Laplacian constant- (CQ) wave equation is used as the forward modeling kernel in FWI. The adjoint operator...

... modeling center frequency dispersion adaptive padéseries upstream oil & gas ip effect geophysics electromagnetic modeling equation annual meeting differential equation conductivity time domain reservoir characterization electric field cole-cole model padéseries seg seg...