Recording P- and S-wave modes acquires more information related to rock properties of the earth’s interior. Elastic migration, as a part multicomponent seismic data processing, potentially offers great improvement over conventional acoustic migration create spatial image some medium properties. In framework elastic reverse time we have developed new scalar vector imaging conditions assisted by efficient polarization-based mode decoupling avoid crosstalk among different wave for isotropic...

Seismic data processing requires careful interpolation or reconstruction to restore the regularly irregularly missing traces. In practice, seismic with consecutively traces are quite common, which will lead a great challenge for conventional methods. To effectively reconstruct successively blank in data, we proposed self-supervised deep learning approach, convolutional neural network is trained supervised manner pseudolabels obtained from unlabeled observed data. The automatically generated...

In elastic imaging, the extrapolated vector fields are decoupled into pure wave modes, such that imaging condition produces interpretable images. Conventionally, mode decoupling in anisotropic media is costly because operators involved dependent on velocity, and thus they not stationary. We have developed an efficient pseudospectral approach to directly extrapolate waves using low-rank approximate mixed-domain integral basis of displacement equation. applied [Formula: see text]-space...

Elastic reflection waveform inversion (ERWI) utilizes reflections to update the low and intermediate wavenumbers in deeper part of elastic models can provide good initial for full (EFWI). Although ERWI aims mitigate nonlinearity when starting from a poor model, it suffers cycle-skipping problem due objective function fitting. Building P- S-wave velocity EFWI through wave-equation traveltime (ERTI) would be effective robust since information relates background model more linearly. However,...

Conventionally, multicomponent geophones used to record the elastic wavefields in solid seabed are necessary for ocean bottom seismic (OBS) data reverse time migration (RTM). Particle velocity components usually injected directly as boundary conditions elastic-wave equation receiver-side wavefield extrapolation step, which causes artifacts resulting images. We have deduced a first-order acoustic-elastic coupled (AECE) by substituting pressure fields into velocity-stress (EVSE). AECE has...

Multicomponent seismic data acquisition can reveal more information about geologic structures and rock properties than single component acquisition. Full elastic wave imaging, which uses multicomponent to its full potential, is promising because it provides opportunities understand the material of earth by joint use P- S-waves. A prerequisite imaging availability a reliable macrovelocity model. Migration velocity analysis for P-waves, fill that requirement P-wave velocity, has been...

Summary Elastic reverse time migration is developed for better characterization of the subsurface using multi-component data. Typically, imaging condition applied to pure P- and Swave fields separated by divergence curl operators in isotropic media. However, S-wave are scalar vector wavefields, respectively. Directly crosscorrelating P-wave mode with components cannot obtain unique image. A scalarization step needed implement converted wave imaging. Meanwhile, polarity reversal causes...

Quasi-P (qP)-wavefield separation is a crucial step for elastic P-wave imaging in anisotropic media. It is, however, notoriously challenging to quickly and accurately obtain separated qP-wavefields. Based on the concepts of trace stress tensor pressure fields defined isotropic media, we have developed new method rapidly separate qP-wave transversely medium with vertical symmetry axis (VTI) by synthesized from ocean-bottom seismic (OBS) data as preprocessing reverse time migration (ERTM)....

We present an approach to separate the P- and S-waves in elastic displacement component data recorded at earth's surface by using so-called pure mode wave propagators anisotropic media. First, we reverse-time extrapolate common-shot a vertically homogeneous computational model with equation reference depth close surface. Then forward propagate these extrapolated wavefields pseudo-pure equations reconstruct equivalent within narrow band near Finally, project those onto polarization direction...

Elastic reverse time migration (ERTM) contributes to migrate the multi-component seismic data which have recorded vector wavefields in subsurface media. Besides obtain structure image, it also provides more opportunity for reservoir prediction and characterization. Angle-domain prestack depth (PSDM) can generate common image gathers (CIGs) with fewer artifacts than conventional offset-domain PSDM, thus is helpful estimating elastic parameters (such as velocities of P- S-waves) parameters. To...

Converted-wave has the potential to provide a better imaging result than compressional (P) wave in some special cases. However, shear (S) velocity is necessary be estimated, addition P-wave velocity. Differential semblance optimization (DSO) shown robust method estimate background As one of equation migration analysis (WEMVA) methods, it can overcome problems ray-based solutions. With given velocity, we automatically S-wave via DSO elastic media. The operator based solely on kinematic...