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Discussion papers | Copyright
https://doi.org/10.5194/npg-2017-62
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 27 Oct 2017

Research article | 27 Oct 2017

Review status
This discussion paper is a preprint. It has been under review for the journal Nonlinear Processes in Geophysics (NPG). The revised manuscript was not accepted.

Delineation of shallow channel geometry and infill lithology using Spectral decomposition and seismic attributes: A case study from the North Sea Basin, Netherlands

Kenneth Samuel Okiongbo1 and Righteous Ombu2 Kenneth Samuel Okiongbo and Righteous Ombu
  • 1Geophysics Unit, Department of Physics, Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria
  • 2Department of Applied Sciences, Federal Polytechnic, Ekowe, Bayelsa State, Nigeria

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.

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Kenneth Samuel Okiongbo and Righteous Ombu
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Kenneth Samuel Okiongbo and Righteous Ombu
Kenneth Samuel Okiongbo and Righteous Ombu
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Short summary
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...
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