Nonlinear beamforming seismic data reconstruction: A novel kinematic wavefront based method

In 3D seismic data acquisition, sufficiently dense spatial sampling is most often not possible, because of physical, financial, and temporal constraints. The resulting aliased data is a major obstacle for accurate subsurface images. Therefore, methods are needed to reconstruct these sparse data to an adequate sampling. We develop a novel...

Discerning small time-lapse traveltime changes by isolating the seismic response of a reservoir using the Marchenko method

4D seismic studies aim to observe time-lapse changes in the subsurface between a baseline and a monitor study. These changes are generally small, and the seismic response from a deep reservoir can be concealed by reflections from shallow structures. Here, we introduce a novel way of isolating the reservoir response by means of the Marchenko...

Locating scatterers while drilling using seismic noise due to tunnel boring machine

Unexpected geological structures can cause safety and economic risks during underground excavation. Therefore, predicting possible geological threats while drilling a tunnel is important for operational safety and for preventing expensive standstills. Subsurface information for tunneling is provided by exploratory wells and by surface...

Anisotropic traveltime inversion of hard rock targets: Synthetic and Field Study at the Grimsel Test Site

New method for discriminating 4D time shifts in the overburden and reservoirr

Understanding seismic changes in the subsurface is important for reservoir management and health, safety and environmental (HSE) issues. Typically the changes are interpreted based on the time shifts in seismic time-lapse (4D) data, where sources are at the surface and receivers are either at the surface or in a borehole. With these types of...

A modified delay-time method for statics estimation with the virtual refraction

Topography and near-surface heterogeneities lead to traveltime perturbations in surface land-seismic experiments. Usually, these perturbations are estimated and removed prior to further processing of the data. A common technique to estimate these perturbations is the delay-time method. We have developed the “modified delay-time method,” wherein...

Route Level Evaluation of Queue Lengths Display at the Amsterdam Orbital Motorway: Evaluation of Route Information Amsterdam, Phase 4

Report published by the Delft University of Technology, Transportation Planning and Traffic Engineering Section, commissioned by the Ministry of Transportation, North Holland Directorate. The use of Variabie Message Signs (VMS's) is generally considered to be a powerful tool to influence (en-route) route choice in order to improve safety and...

Velocity analysis by subtraction of zero-offset traveltime