Changes to the Connection property output in 3.2 release

All of the Connection properties, available in earlier versions of TransGen, can be selected as output to file(s) via the Output - derived and user-defined properties page in WizGen. Most are unaffected by the inclusion of the new single-phase functionality to model user-defined and stochastically generated fault zone structure and simply reflect the geometry of the parent model. However the output files for UFTRANS, FTRANS and TRMULT will contain data for all connections in both the parent and user-defined models.

The UFTRANS output file

In previous versions of TransGen, this file contained "unfaulted" transmissibility values of each connection (neighbour and non-neighbour) in the model, i.e. the transmissibility value excluding fault rock effects calculated by the simulator and upon which any transmissibility multipliers will operate. Values for each of these connections are still contained in this file, but additional data have been added to reflect connections that exist in the user-defined model, but not the parent model. These connections have unfaulted transmissibility values of 0.0.

Under certain conditions a UFTRANS value will not be calculated by TransGen even though the connection exists in the user-defined model. This occurs on a user-defined trace (i.e. a trace included in the TransGen run using the TGTHROW keyword where no grid offsets are present in the parent model) which has a small enough throw to preserve neighbour connections. The faulted transmissibility of this connection is included in the simulator input output files as a TRANX or TRANY value, and no unfaulted transmissibility needs to be calculated. In this case the UFTRANS file will report the connection transmissibility as "UNFAULTED".

The FTRANS output file

The FTRANS file contain a listing of the final (i.e. including fault rock and/or geometrical modifications) transmissibilities of all connections in both the parent and the user-defined models. A connection that exists in the parent model, but not in the user-defined model, is assigned a transmissibility of 0.0.

The TRMULT output file

In previous versions of TransGen, the TRMULT file essentially contained the same data as the EDITNNC file, but with the addition of transmissibility multipliers for neighbour connections (i.e. connections output as faulted transmissibility values in the TRANX and TRANY files). In the current version, the file contains a listing for all connections present in either (or both) the parent model and the user-defined model.

If a connection exists in both, the file reports the transmissibility multiplier.

If a connection exists in the user-defined model, but not the parent model a value of INFINITY is reported.

If a connection exists in the parent model but not in the user-defined model, a value of 0.0 is reported.

If a neighbour connection exists on a user-defined trace which is unfaulted in the parent model, no unfaulted transmissibility has been calculated, hence a transmissibility multiplier cannot be derived. As in the UFTRANS file, transmissibility multipliers for these connections are reported as "UNFAULTED".