Tectonic models for natural stress, exhumation and temperature in shale gas basins

Tectonic models for natural stress, exhumation and temperature in shale gas basins

Publieke samenvatting / Public summary

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

The project deliverables are:

  • A 4D geomodel, constrained VR and AFT and temperature data, and 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 the regional interpretation of mechanical properties and natural fractures for various shale formations; and their effect on productivity (in close co-operation with other projects in the WP).

Using feedback from operators, one or more case studies will be analysed in detail to validate the basin to field-scale approach.

The project will be carried out over 4 years, of which the first year served as pilot year. In the already-funded pilot year (2013) the focus was on the 4D geomodel, and a forward look at the implications of regional partitioning in crustal rheology on stress and deformation.