... Seismic diffractions generated by small-scale faults, inhomogeneities, and discontinuities contain quantities of valuable information and thus can be used for seismic interpretation in the exploitation of hydrocarbon reservoirs. Separating diffractions in migrated dip-angle domain gather...

... Fault-karst developed in carbonate is an important reservoir space for oil and gas. However, the fault-karst has various forms and scales, and its scale is much smaller than the seismic wavelength, it presents as diffraction in the seismic response. Using the diffraction information can improve...

... reflections and produce artificial diffractions from the stair endpoints. In this study, we proposed a stable 3-D immersed boundary method (3DIBM) for acoustic wavefield simulation to reduce the simulation errors caused by irregular topography, which provides a valuable forward modeling engine for 3-D land...

... properties across the geologic contacts where the reflections were generated. The wavefield propagating in the subsurface can also generate seismic diffractions when the waves interact with geologic contact terminations caused by faults, unconformities, stratigraphic pinch-outs, or karst. Since seismic...

... Diffractions are the seismic response of subsurface geological discontinuities, and thus, carry detailed geological information in 3D seismic exploration. It is a challenge to separate weak diffractions from specular reflections, especially when they have similar kinematical characteristics...

... We propose a new diffraction-separation method that uses a geometry mode decomposition (GMD) algorithm to remove reflections and separate diffractions in the common-offset or poststack domain. The key idea of this method is based on the fact that, in the frequency– wavenumber ( f – k ) domain...

... to generate diffraction seismic attribute volumes sensitive to a specific seismic lineament. The results have been correlated with an image log to confirm the nature and fill of the seismic lineaments. Understanding the variation in length and intensity of those events is critical to understanding...

... wavelength, the reflected wave becomes scattering, which is also known as the diffraction. Both reflection and diffraction can be used to image subsurface structures, and the latter is helpful to resolve small-scale discontinuities, such as fault plane, pinch-out, Karst caves and salt edge. However...

... The paper presents an approach to characterize fractured zones by seismic data. It combines diffraction imaging, analysis of scattering indicatrix, and topological analysis of diffraction images. The scattering indicatrix attributes comply with the topological analysis of diffraction images...

... Diffractions encode valuable geologic information about small-scale discontinuous structures, such as faults, pinch-outs, and fractures, and have the great potential of high-resolution imaging. However, diffractions are characterized by weak amplitude and rapid attenuation. We propose...

... The ballastless track is widely used in Chinese high-speed railways. The defect detection of it is an important task. Ground penetrating radar (GPR) is the main tool used for this task. In GPR data, the reflection from underground structures and the diffraction from potential defects (e.g. voids...

... in order to enhance the resolution. Waveform inversion schemes are more sensitive to starting parameters relative to the other inversion methods. In this work, we present a brief overview of the role of diffraction in increasing the resolution of inversion-based techniques such as seismic traveltime...

... reservoir characterization gajewski exploration geophysicist 10 localization microseismic event location geophysics eage extended abstract vanelle expanded abstract annual international conference diffraction exhibition eisner seg international exposition © 2020 Society of Exploration...

... The application of common offset wavenumber filtering on seismic data show improvements in isolating diffractions used to locate voids. F-k filtering is a simple method for attenuating primary waves and enhancing diffraction amplitudes. However, diffractions may also be attenuated where local...

... In order to separate weak diffraction from specular reflection in the shot domain, we build the common virtual source gather (CVSG). For the reflection generated from the same reflector, it can be regarded as originating from one virtual source. According to this behavior, the reflection can...

... Diffracted waves carry high resolution information that can help interpreting fine structural details at a scale smaller than the seismic wavelength. Because of the low signal-to-noise ratio of diffracted waves, it is challenging to preserve them during processing and to identify them...

... Diffractions carry information that can help imaging of small-scale heterogeneities smaller than the seismic wavelength. Extracting diffraction events is key step because the amplitude is weaker than that of overlapped reflection events. Recently, deep learning (DL) based approach has been used...

... Methods developed for diffraction imaging are commonly based on a separation technique between continuous and discontinuous structural elements, based on their seismic response. Seismic imaging in the dip-angle domain decomposes direction-dependent images where the response of different...

... While established methods for the retrieval of depth-velocity models require seismic data with sufficiently large channel counts, velocity-model building for zero-offset data remains challenging. Building on recent studies, we propose a workflow that exploits the diffracted wavefield for depth...

... reflector element. In this abstract, we give a general criterion for identifying edge diffraction that we formulate in terms of the NIPand N-wavefront curvatures. This allows us to complement the wavefront curvature based classification of possible wave phenomena present in seismic datasets. It has...