Re-start option failure GOFT/GENER

[AMCHE]

Dear Matt (and others),

I am using the PetraSim software for modelling CO2 sequestration. In order to look at both advective as well as diffuse scenarios affecting the caprock, I am, as a first step trying to equilibrate the rock fluid to a choosen mineralogy of both a reservoir and a caprock region in the model before adding a gas phase. I find no problems in doing that. However, when I add gas, and prepare to set up for a restart run, using the equilibrated system I get the same error of “Element (*number*) in data block “ Goft†does not have a valid “Gener†item –ignore this and proceed “, and the system chrashes. This is also the case when running the "gas-scenario" without equilibration of the fluid.

I have first started using the program; and suspect it is due to my unexperience. I would very much welcome any clue as to why set-up fails; thanks

Anne-Mette

[Alison]

Hi Anne-Mette:

As mentioned in the other post, the message you are encountering is an warning message, and not a fatal error. It is ignored by TOUGHREACT, and should not be the cause of the problem with the model.

It is possible that this problem is caused because you are trying to restart a model using a previous simulation that had run for more than 99,999 time steps. The fixed format used by TOUGH2 and TOUGHREACT will cause overflow characters in the time step field (KCYC), and will cause the model crash during restart.

If this is not the problem, I'd be happy to take a look at your model to see if there is something else going on. Please send your files to alison@rockware.com.

Best Regards,

Alison