Received: 09 Oct 2017 – Discussion started: 27 Oct 2017
Abstract. In the Southern North Sea, 3D seismic data had been widely acquired to explore for hydrocarbons, but interpretations of these datasets until now focus mainly on the deep exploration targets of the petroleum companies. Less attention is given to shallow sediments. But these sediments often contain channels that can serve as potential reservoir units. Thus the mapping and identification of these shallow channels and defining their infill lithology is important. In this study, seismic spectral decomposition technique has been used to delineate shallow thin channel geometry in a 3D seismic data acquired in the Dutch sector of the North Sea. The concurrent interpretation of curvature and coherence cubes with seismic facies analysis based on reflection terminations and geometry, amplitude and continuity enables the discrimination between shale versus sand filled channels. The results of the spectral decomposition show two distinct low sinuosity channel features in NNE–SSW direction but becomes diffuse towards the North. The strong negative curvature anomaly along the channels's axes observed in the most negative curvature attribute implies that the sediments within the channels have undergone more compaction. These strong negative curvature anomalies are interpreted to be due to differential compaction of shale filled channels.
This preprint has been retracted.
How to cite. Okiongbo, K. S. and Ombu, R.: Delineation of shallow channel geometry and infill lithology using Spectral decomposition and seismic attributes: A case study from the North Sea Basin, Netherlands, Nonlin. Processes Geophys. Discuss. [preprint], https://doi.org/10.5194/npg-2017-62, 2017.
In the exploration of hydrocarbons, shallow sediments are often times ignored. But these sediments can be potential reservoir units. A gas filled stratigraphic trap serve as a tool for shallow geohazard analysis and might indicate the presence of deeper hydrocarbon reserves. Using spectral decomposition method coupled with coherence and curvature attributes, we define the channel geometry and infill lithology in the F3 Block, Netherlands. The channels are shale filled and thus non productive.
In the exploration of hydrocarbons, shallow sediments are often times ignored. But these...