Midland Valley

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Stress Analysis

A graphical tool for analysing and understanding the stress response behaviour of fault and fracture systems

Stress Analysis

The Stress Analysis module enables you to rapidly visualize and evaluate 3D stress states and potential fault and fracture activity.

This information can then be used to build and analyse a wide range of scenarios encountered in reservoir and mine planning, CO2 storage, waste disposal and other engineering applications, where it is essential to understand the likely failure envelope of key structural features.

Evaluate the risk of leakage within reservoir seals, predict mineralisation potential and geotechnical failure. Test a series of principal stresses and pressure profiles through depth, taking into consideration hydrostatic, pore and lithostatic pressures.

Features

  • Compute stress attributes for slip tendency, dilation tendency, fracture stability, slip stability, retention capacity and leakage factor of planes and lines.
  • Visualize and evaluate critically stressed planes in a 3D View. Any orientation data selected on the stereonet plot or Mohr diagram is simultaneously selected in the 3D model.
  • Visually display shear and normal stress values for ease of use on the Mohr diagram when moving the cursor over the stereonet plot.
  • Use colour mapping to show a colour scale of the current displayed stress attribute that is plotted on the stereonet plot and Mohr diagram at a specific depth.
  • Define and display pore pressure profiles.
  • Quickly estimate which fracture sets and fault planes are more likely to fail or reactivate by looking at the colour map: warmer colours indicate the faults more favourably orientated to failure in a user-defined stress state.

New for 2017

  • Max shear direction is now showing the sense of slip.
  • Lineation data can now be displayed with a sense of slip.
  • Lineation data can now be displayed with a tangential slip representation (tangent lineation / Hoeppner plot). The slip vector can be set to represent either hanging wall or footwall movement.
  • Lineation data can now be projected onto slip planes.
  • The sense of slip is now used correctly for stress inversion.
  • Seismic Moment Tensor Decomposition is now available in Stress Analysis. The user can choose between a shear and tensile source model.
  • When analysing fractures in the Stress Analysis module, the specific orientation data that meet a failure criterion are shown as filtered points or as a filtered fractures in the view. All Stress Overlays with its appropriate tolerance can be used for this filtering method. Furthermore, the filtered information can be created as an object for further usage in projects.
  • The palaeo-stress state can be determined from striation data within the Lineation / Stress Inversion sheet. The method used for determining the stress state is from Angelier (1990).