... problem. Moreover, the sparsity of OBN deployments mitigates the fold and can induce aliasing artifacts in the shallow part of the model. In this context, deriving a sufficientlyaccurate initial model that prevents cycle skipping is difficult. We circumvent this challenge with time-domain extendedsource...

... preconditioning scheme to provide a better sampled initial model for DL interpolation. The DL model works iteratively, passing the data between the unsupervised learning architecture for feature extraction and the iterative framework for reconstruction. An attention network highlights the important information...

... Elastic Full Waveform Inversion (EFWI) is increasingly being viewed as a key technology for seismic imaging. Most successful FWIs require a good set of initial models. Obtaining these models can be time-consuming and ad hoc methods are often used. Several ideas have been recently proposed...

... simulated annealing (VFSA) algorithm. We demonstrated the effectiveness of this inversion technique on a 2D line extracted from F3-Netherlands dataset. geology reservoir characterization initial model exploration geophysicist geologist seismic model impedance artificial intelligence seismic...

... waveform inversion applied geoscience & energy 10 geological subdiscipline inverted model bb method artificial intelligence economic geology iteration dataset petroleum geology machine learning gradient initial model deep-learning approximated inverse hessian american association...

...-middle layer: the initial model of the tomographic inversion is established by the combination of up-hole and first breaks, and the segmented offset inversion is performed to match ray depth with the thickness of the LVL. The error caused by the shallow depth of up-hole survey and the mismatch of offset...

... part around the organ of interest. Due to the nature of the garment, the exact position of the transducers is not accurately known a priori . Moreover, FWI is known to be computationally expensive and requires a reliable initial model to efficiently converge to an accurate model. Herein, we...

... that extended FWI enhance the velocity of complex overburden and improve the image below the salt. reservoir characterization fwi objective function velocity model geologist waveform inversion exploration geophysicist extended fwi imaging geology full waveform inversion initial model true...

... interpretation data, and initial models to invert elastic parameters and anisotropy parameters for fracture-type reservoirs. Results from datasets with different signal-to-noise ratios demonstrate that the joint-driven inversion method accurately and efficiently estimates the elastic parameters and anisotropy...

... Full-waveform inversion (FWI) applied to regions with large salt bodies often fails without a good initial model, long offsets, and low frequencies. To address this limitation, a previous study embedded U-Nets within a multi-scale FWI to assist in building salt bodies by flooding and unflooding...

...). structural geology geologist stratigraphy petroleum geology applied geoscience economic geology applied geoscience & energy 10 multiparameter full-waveform inversion rock type geological subdiscipline fwi model initial model final fwi model exploration geophysicist reflectivity american...

... initial model frazer prestack waveform inversion application inversion Seismic inversion method of prestack waveform of isotropic elastic medium and its application for exploration targets of shale reservoir Zhanqing Yu*, Cheng Wang Exploration and Development Research Institute of Daqing Oilfield...

... inversion inversion ei-43deg seismic inversion initial model western desert reservoir characterization optimizing elastic impedance inversion sand prediction exploration geophysicist 10 upstream oil & gas egypt ei-43deg target sand sand body lithology Optimizing Elastic Impedance...

...- utilized to stabilize the inversion. As an alternative, we pro- sponses in challenging scenarios, in particular at shallow water pose to simultaneously invert for the source signature and the depths and where the initial model built for FWI does not ac- medium parameters close to the source and receiver...

... seismic imaging projects to establish detailed velocity models. It is a natural More robust FWI algorithm thought to combine time-lapse seismic and FWI. A literature review of 4D FWI shows that choosing the The potential benefits of combining time-lapse seismic and optimal initial model suitable for both...

... upstream oil & gas initial model exploration geophysicist 10 vertical seismic profile applied geoscience boundary inversion elastic fwi elastic fwi workflow inverted model reservoir characterization elastic full waveform inversion geophysics complex anticline Elastic Full Waveform...

... Hz FWI inversions (with and without the sparse Despite numerous salt scenario tests and subsalt velocity nodes) were carried out to evaluate the impact of sparse node updates, the challenges in interpreting Cenozoic and data. Using the WATS data, a rough initial model was built Mesozoic sections were...

... impedance contrasts in correspondence of the boundaries. (FWI), to image shallow heterogeneities with high After testing various VS and VP initial models, retrieved by resolution. The study is focused on evaluating the DCs analysis, with 3D FWI based on a 2D acquisition effectiveness of using a 3D...

... in the salt can also be detected. Finally, an anisotropic FWI is applied for higher frequency iterations. As can be seen in Figure 5, it shows the initial model, inverted as well as true model. The inverted and true velocity models match with each other quite well. We use two validation wells which...

... of time residual and L2 norm to update the geophones were evenly distributed at the depth range from velocity model. 450 m to 3350 m, and the source was at 30 m from the well. We used the gradient Vp model as an initial model (green Formation attenuation has mainly two effects on the dashed curve...