Main Menu

• New View/Edit File option. In the File menu, a new View/Edit File… option is implemented to view and edit the current stress model file (*.stress, *.rock, and *.xml files) and fracture file (*.fracs and *.ts files) as well as any other files used in analysis.

• Extended Stress Units. In Consistent with GMI•WellCheck, the Stress Units option in the View menu explicitly offers five pressure gradients (PPG, SG, lb/ft3, PSI/ft, kPa/m) and three pressure units (PSI, MPa, kg/cm2)

• User-defined Azimuth of SHmax. The Modify Input window allows the manual entry of the Azimuth of SHmax. This fixed value of SHmax overrides values given by an input file and allows flexible analysis of the effect of stress orientation.

• Depletion/Injection Graphics. If depletion or injection is applied, both the tadpole plot and the stress model plot indicate the depletion/injection zone by means of shading.

• Depletion/Injection History. If Consider History is checked in the Modify Input window then the depletion/injection (defined by the values of dPp and A in this window) is applied to the stress profile from the preceding phase and the effects are cumulated. Thus, reservoir depletion/injection can be analyzed in several phases with different stress paths.

• Representative Stress State in “Set of Fractures” Program Mode. The Set of Fractures program mode was originally implemented in GMI•MohrFracs in order to allow comparison of multiple fractures in one Mohr diagram and one stereoplot. These plots require a fixed depth-independent state of stress that is represented by fixed gradients of Sv, SHmax, Shmin, and Pp inside the analysis depth range. To assess the approximation error over this depth range, GMI•MohrFracs now shows the representative stress state as vertical dashed lines between the top and bottom horizontal bars that define the analysis range.

• Well Trajectory View. This feature computes for a given stress state the proximity to failure of a hypothetical fracture oriented normal to the wellbore trajectory. It is an optional view that allows the user to better visualize the likelihood a given well trajectory would intersect fractures that may be critically stressed. This functionality is useful in both a post mortem and predictive sense. The feature substantially improves the visualization of the potential for enhanced production through a fractured reservoir.

• Improved GoCAD T-Surf export. The GoCAD file reader is improved (the previous version failed to read untypical *.ts file).

• Expanded exported data file. Output ASCII file *.wout has been extended to include Sv, SHmax and Shmin (or S1, S2, S3 in case of inclined stress).

• XML Data Transfer. In addition to the regular input of a stress model from ASCII files (*.stress, *.rock), GMI•MohrFracs can load a stress model from XML files. The XML files can also deliver formation tops (before this was only available through ASCII files), lithology columns and the well trajectory.

• Lithology Column. Information on lithostratigraphic units can be imported through XML files (see above) and a lithology column is then displayed on the right-hand side of the tadpole plot in the Analysis window. The lithology column also appears in the Summary plot.

• Rock file as stress input file.GMI•MohrFracs can load a stress model from the GMI•Wellcheck rock file (*.rock) in addition to the regular stress input file (*.stress).

• Extended Output File.The output ASCII file has five new columns (Sv, SHmax, Shmin, Pp, AziSH) that represent the reference state of stress at individual fractures. The reference state is the original stress model given by the input file plus any effects due to depletion/injection (if applied).