Imaging of multiples, as a supplement to imaging primaries, can provide wider range subsurface illumination. Therefore, it more detailed information on structures. However, multiples suffers from crosstalk issues generated by unrelated events. Many strategies have been proposed attenuate crosstalk, among which the angle domain Radon attenuation algorithm achieves good application effect. In dom...

The accuracy of computed traveltimes in a velocity model plays crucial role localization microseismic events. conventional approach usually utilizes robust fast sweeping or marching methods to solve the eikonal equation numerically with finite-difference scheme. These introduce traveltime errors that strongly depend on direction wave propagation. Such error results moveout changes and introduce...

The conventional velocity scan can be computationally expensive for large-scale seismic data sets, particularly when the presence of anisotropy requires multiparameter scanning. We introduce a fast algorithm for 3D azimuthally anisotropic velocity scan by generalizing the previously proposed 2D butterfly algorithm for hyperbolic Radon transforms. To compute semblance in a two-parameter residual...

The computational tools for imaging in transversely isotropic media with tilted axes of symmetry (TTI) are complex and in most cases do not have an explicit closed-form representation. As discussed in this paper, developing such tools for a TTI medium with tilt constrained to be normal to the reflector dip (DTI) reduces their complexity and allows for closed-form representations. We show that, ...

In data continuation, the information present in the collected data is used to estimate data at new positions. We investigate two examples of data continuation: data healing and dip moveout. By composing a modeling operator with an imaging operator we can construct an operator to perform each of the tasks. We review the theory and present an algorithm for data continuation specifically directed...

Ray-based reflection tomography has become widely used as a tool for updating velocity models in depth imaging. Historically, development of ray-based tomography for depth imaging followed two separate methodologies. Early ray-based tomography was based on differences in traveltime observed between modeled data and actual seismic data (Bishop et al, 1983). As technology for imaging in complex a...

In this paper, we demonstrate that better primary preservation and effective surface multiple attenuation can be achieved by applying various iterative surface multiple attenuation approaches in different domains and in different areas. In areas where smaller moveout separation between primary and multiple exist, a conservative least-squares adaptive subtraction method is used to preserve prima...