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

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.