... Angle-domain common image gathers (ADCIGs) describe reflectivity variations over reflection angles and azimuth for model building and amplitude versus angle (AVA) analysis. The ADCIGs can be obtained from migration, such as reverse-time migration (RTM). In this paper we present image-domain...

... angle-domain common-image gathers (ADCIGs) which represent the positions of reflective layers to a certain extent, can be obtained easily without increasing computational cost. In this study, we develop a convolutional neural network to study the connection between ADCIGs and the reflective layers...

... angle gather least-square migration seg international exposition deconvolution imaging condition frequency wem adcig iterative least-square migration lsm upstream oil & gas imaging condition migration lswem angle domain angle image illumination exploration geophysicist 10 cross...

... built by using ray-based reflection tomography. Unlike conventional beam migration algorithms, CRAM enables to extract specular energy via bottom-up ray tracing from each image point, and directly calculate angle domain common image gather (ADCIG). The resulted stacked section of CRAM showed higher SNR...

... gathers (ADCIGs). Numerical examples demonstrate that there are significant differences in the subsurface offset behavior between the VSP survey and the surface seismic survey. We conclude that the strategies functioning well in surface seismic processing workflow may not be suitable for direct...

... effects of the derivative operator, we introduce a low-wavenumber compensation operator into the angle domain objective function. Combined with the true-amplitude angle domain common image gathers (ADCIGs), the DSO kernel can generate artifact-free inversion results. Numerical examples illustrate...

... ABSTRACT Angle-domain common imaging gathers (ADCIGs) from reverse time migration (RTM) are essential for velocity updates and amplitude variation with angle inversions. However, the extraction of ADCIGs from RTM is still challenging in computational stability and efficiency. We develop...

... migration odcig amplitude reflection coefficient adcig biondi migration velocity Aki , K. , and P. G. , Richards , 2002 , Quantitative seismology : University Science Books . Albertin , U. , D. , Yingst , P. , Kitchenside , and V. , Tcheverda...

... equation migration velocity analysis adcig reservoir characterization tcalc upstream oil & gas saudi arabia government rmo sog velocity error seg international exposition rec angle-domain common-image gather migration geophysics elastic reverse time migration src...

... present an anisotropic tomography method based on angle domain common imaging gathers (ADCIGs). As the most sensitive parameter related to traveltime is velocity, we firstly use the isotropic tomography method to obtain an accurate velocity model. On this basis, the anisotropic RTM is conducted to obtain...

... ABSTRACT Angle domain common image gathers (ADCIGs) can be generated by reverse time migration (RTM). The kinematic moveouts are important for velocity model building, and the amplitude fidelity is crucial for attribute analysis. ADCIGs can be generated from conversion of time-shift or offset...

... Summary Angle domain common image gathers (ADCIGs) play an important role for migration quality control and velocity analysis. ADCIGs can be constructed by employing optical flow to compute the propagation direction of seismic waves during imaging, from source and receiver locations. When up...

... reservoir characterization adcig upstream oil & gas pvrtm diffraction Chang , C. , Y. Zhang , and Y. Gdong , 2004 , Cellular automata for edge detection of images : Proceedings of 2004 International Conference on Machine Learning and Cybernetics (IEEE Cat. No. 04EX826...

... direction polarization vector adcig imaging condition mcmechan upstream oil & gas propagation direction geophysics seg seg international exposition ps image reverse time migration elastic reverse time migration particle velocity decomposition vector propagation vector polarity reservoir...

... ABSTRACT Poynting vectors are being a tool of calculating vector wavefield and sort data into angle-domain common-image gathers (ADCIGs) intrinsically, whereas conventional reverse time migration (RTM) requires extra processing to bin data into ADCIGs. The difficulty of Poynting vectors occurs...

... ABSTRACT This paper presents an angle domain illumination compensation factor to heal the amplitude errors caused by irregular seismic acquisition geometries. The resulting angle domain common image gathers (ADCIG) from 3D reverse time migration (RTM) can preserve the amplitude of the seismic...

... wavefield migration result adcig imaging condition seg seg international exposition upstream oil & gas particle velocity vector reservoir characterization vector-based excitation amplitude imaging condition wave reflection coefficient Chang , W. , and G. A. Mcmechan , 1987...

... ABSTRACT Due to insufficient velocity information and complicated wave propagation phenomena, such as scattering, interference and multipathing, angle-domain common-image gathers (ADCIGs) may not be flat after velocity model building and migration. This can degrade the quality of stacked...

... imaging condition data quality amplitude reservoir characterization source direction reflector normal local window adcig reverse time migration seg seg international exposition decomposition fourier artifact upstream oil & gas artifact migration fourier transform sacig...

.... Presentation Date: Wednesday, October 19, 2016 Start Time: 8:50:00 AM Location: 142 Presentation Type: ORAL adcig reflector seg seg international exposition efficient approach annual international meeting upstream oil & gas geophysics waveseis llc summary velocity model migration...