In this paper we present a new source-over-cable marine seismic acquisition technique that initially was developed to meet imaging challenges of the Loppa High in the Norwegian Barents Sea. Two seismic vessels operate in tandem; one streamer vessel towing a spread of deep, densely ...
We demonstrate a recently developed method for computing tomography model uncertainties and mapping them into the migrated domain. The method generates after the final tomography a series of equi-probable velocity model perturbations within a standard deviation confidence level. This allows computing standard deviation-like attributes ...
Self-published 12-page White Paper on the subject of National Data Repositories. Distributed at NDR conference in June 2017.
We present a workflow for 3D MAZ PSDM velocity modeling with tilted orthorhombic anisotropy. We focus on two aspects of depth-velocity modeling that are extremely important for seismic data from the NW Australian shelf: (1) high resolution adaptive seismic tomography to deal with strong ...
It is well known that imaging of complex regions can be significantly improved with increased illumination in terms of offset and azimuth sampling. In this case study we illustrate how an existing large scale acquisition can be enriched by acquiring a second complementary survey ...
Absorption effects in the Earth attenuate high frequency seismic signal progressively with depth, reducing resolution and limiting the interpretability of the data. Conventional post-migration Q compensation methods often rely on artificial mechanisms to limit amplification of noise, at the expense of unintentionally restricting recovery ...
The North Sea is a mature basin where it is increasingly challenging to make new and economically viable discoveries. Even after discoveries have been made, it is vitally important to have high confidence in the reservoir’s extent and spatial location before committing to a ...
Complex overburden geology often creates difficulties in imaging reservoirs situated below. We used a field dataset from the GOM to demonstrate the benefits of combining FWI and LSM. We were able to generate a high-resolution velocity model through FWI, then use LSM to further ...
Images from Kirchhoff migration can suffer from uneven illumination and contamination by migration artefacts. One of the issues is that migration is not a true inverse operation – it is based on the adjoint of the forward modelling operator. In contrast, least squares migration ...