19-07-2014

Innovative tectonostratigraphic framework

The strata in the Upper Jurassic - Lower Cretaceous consist of complex and heterogenous sediments with lateral facies changes, repetitive log patterns, and long-term trends. Also local salt tectonics, and structural compartmentalisation further hamper straightforward seismic interpretation and log correlation.

Objective
To develop a new regional tectonostratigraphic multi-basin model for the entire Dutch Offshore during the Upper Jurassic- Lower Cretaceous interval with independent control on the absolute timing of tectonic events (e.g. fault movement of blocks) through isotope stratigraphy.

Methodology

  • Independent reconstruction of geological time and facies changes in the infill of the basins.
  • Determination of the level of detail stratigraphy to improve 3D lithofacies models to de-risk well planning targets.

Innovative approach
Aiming at:

  • Pushing the boundaries of stratigraphic detail that is used in operational geology through integrated biostratigraphical and stable isotope analyses. High-order changes related to global carbon and sea level cycles are a backbone for interpreting short-terms high-order changes that can be correlated. This new level of detail can potentially significantly reduce planning risks and is based on the latest scientific insights on global event stratigraphy.
  • Direct calibration of regional stratigraphic results to the global standard through isotope stratigraphy (first-time calibration to absolute ages), which can be applied as an interpretive model in more complex inverted and compartmentalised basins.
  • Coupling the level of stratigraphic detail to the confidence level of 3D facies modelling by adding successive time horizons from the integrated bio and stable isotope results. The combined results potentially lead to a new tectono-stratigraphic multi-basin model that has a relevant level of detail for well planning and de-risking the Upper Jurassic - Lower Cretaceous sequences in the Southern North Sea.

Methodology
By successive addition of this stratigraphic detail to facies models the right amount of control needed for well planning and reservoir modeling can be determined in an iterative way.

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