... Prestack reverse time migration (RTM) is considered to be an accurate imaging method and has been widely used in practical production. However, due to the use of the two-way wave equation and the time-coherent imaging criterion, RTM image generates strong low-frequency noise. Generally...

... wavefield separation expanded abstract imaging applied geoscience reservoir characterization dgd demultiple migration wavefield deconvolution Deconvolution of upgoing and downgoing wavefields: A data example from the NOAKA OBN experiment Tim Seher*, Hassan Masoomzadeh, Yong Ren, Simon Baldock...

... An iterative method of fitting equivalent sources to gravity gradient data will be presented. On each iteration, only a small subset of the final source distribution is fitted using a skeletonized version of the tensor migration density used to position them. The incremental field due...

... One of the critical elements for a successful 4D seismic project is to maximize imaging repeatability between the different seismic vintages in seismic processing by using the same seismic processing sequences and parameters, including the final migration velocity model. Here we propose a new...

... hydrocarbon migration in low porosity systems with small pores and evaluate these controls through numerical simulations of reservoir filling. During migration, two main forces are present: buoyancy and capillary pressure. The fluid properties affect the capillary pressure and govern the buoyancy force. Rock...

... a deterministic velocity-depth model. imaging international operator ensemble perturbation upstream oil & gas summation expanded abstract realization deviation applied geoscience american association society reservoir characterization migration exploration geophysicist statistical...

... Recent observations derived from modern sea floor bathymetry, oceanographic data (flows), and shallow seismic data, suggest a strong link between a biased (one-sided) lateral migration tendency of submarine turbiditic channels and slope gullies, and the flow of along-slope contour currents (e.g...

... In the imaging process, ignoring the effects of attenuation and anisotropy will reduce the quality and resolution of the imaging profile. In this paper, we present a Q -compensated least-squares reverse time migration method in viscoacoustic VTI media ( Q -VTI-LSRTM) using the pure qP-wave...

... of synthetic and field data. The measured amplitude distortions in processed synthetic data are used to correct those in the processed field data. Migration tests show that MBAR can extend the usable angle ranges of common-image-point angle gathers by 5∼15°. Post-migration data conditioning tests show...

... in Houston, Texas. upstream oil & gas absorption attenuation media migration frequency applied geoscience equation imaging extrapolation wavefield operator media anisotropic absorption attenuation media international anisotropic viscous quasi-acoustic media reservoir characterization...

... 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...

... Least-squares migration (LSM) images the subsurface through an inversion process and seeks the reflectivity model that best explains the measured data. This data-fitting process will implicitly compensate for wavefield propagation effects and limited resolution seen with conventional imaging...

... imaging. In this abstract, we present the cascaded application of three critical technologies to improve the subsalt imaging in Brazil Campos basin data: hybrid interbed demultiple, P- and S-salt velocity joint migration, and subsalt converted wave suppression. We will showcase in detail through examples...

... migration using deconvolution energy normalization. Being derived from the existing energy-norm imaging operator, the proposed approach uses multicomponent seismic data without wave-mode decomposition, outputs a scalar image with attenuated backscattering artifacts and does not suffer from polarity reversal...

... for both conventional and staggered source layouts. Illumination analysis, prestack reverse time migration, and turning ray tomography are performed respectively. The results show that the staggered sources acquisition layout provides stronger illumination, higher fidelity subsurface image, and more...

... A pilot project consisting of depth model building and depth migration was performed in 2018 for the Tengiz and Korolev fields onshore Kazakhstan. The pilot work focused on image improvement of a subset of the 2009 3D survey where joint FWI-Grid Based Tomography resulted in a high-resolution...

... and field data, and proven to be useful to inform structural/depth uncertainty. artificial intelligence green international upstream oil & gas wavefield deep green american association neural network machine learning exploration geophysicist propagation energy 10 migration receiver...

... highlight the Least-Squares Reverse Time Migration (LSRTM), which became a reality for several projects nowadays. In this work, we present the outcome of recent LSRTM applications in challenging areas on deep-water offshore of the Santos Basin, Brazil. Important benefits are seen, such as illumination...

... A conventional approach to attenuation compensation for seismic imaging is to pick attenuated time t * from depth-migrated data and to invert t * in tomography for spatially varying Q. The drawbacks of the approach include workflow complexity and spectral distortions by depth migrations. We...

... velocity variations implemented using finite difference (FD). To illustrate the accuracy of the method, several migration examples are shown. upstream oil & gas downward continuation correction variation geophysics media international american association interpolation reservoir...