T2014-07-UG Tectonic models 1.1 University cluster

Summary

This project aims to build unifying scenarios for temperature (basin heat flow), burial, exhumation and stress-deformation history of gas shale formations in the Netherlands, which can be used for basin modelling, for in-situ stress modelling and for the pre-drill assessment of geomechanical properties and fractures. As input public datasets from the mapping of the subsurface of the Netherlands by TNO will be used.

Deliverables of the project will be :

  • 4D geomodel, constrained VR and AFT and temperature data. Scenarios for regional heat flow and lithosphere deformation responsible for observed vertical motions
  • Rheological reconstruction and scenarios for (paleo)stress
  • Analogue (sandbox) deformation models of past stress field and deformation at selected time intervals (including present day)
  • Analysis of the effect of reconstructed temperature/stress/deformation time-paths on regional interpretation of mechanical properties and natural fractures, for various shale formations, and its effect on productivity (in close co-operation with other projects in the WP

This proposal concerns a funding request for the third year of this 4-year project. The project is currently in its second year. In feedback with the operators the focus has shifted in the first year, from onshore Netherlands to the Southern North Sea. Following this shift, the working order has changed. The study of structural controls and the reconstruction of the stress history has gained priority at the cost of development of the 4D geomodel for the onshore Netherlands.

However, the aims of this project remain the same. Since the project started in April 2014, we have performed an extensive analysis of the existing geophysical and geological data on the basis of which we developed a new hypothesis on the origin of the structural grain and its control on later tectonic processes. The same analysis and the ...has led to a new crustal terrain map.

In the third year 2015, the focus will be on the implications of regional partitioning on crustal rheology on stress and deformation and the application of these regional insights to the Southern North Sea and its subbasins. These data in combination with the thermal data will form the basis for the temperature reconstructions, the analysis of sweet spots and the further assessment of field scale implications.