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Everything posted by Alison

  1. How to handle convergence problems

    Ellen, This error is fairly common, and typically means that the model has reached a state not supported by the simulator (for example, a very high pressure or temperature). What TOUGH2 module are you using? I would typically approach this problem by turning on the print options for element 2, and then rerunning the model. You can then view the results for this specific cell through the Results menu. If you continue to have problems, please go ahead and send me your SIM file. Thanks, Alison
  2. There is currently no way to do this. The program includes tools for creating conceptual models, and gridded surfaces created in Petrel could be loaded as ASCII files to create layer or internal boundaries. We would like to explore adding support for more input options, so if you'd like to send me an example of a grid exported from Petrel, please feel free to. My email address is Alison @ rockware.com. Thanks, Alison
  3. We hadn’t responded to this one because there is really no easy way to do this. However, because we've gotten more requests here, I thought that I would go ahead and post the following suggestion.I was able to establish the desired initial conditions using the following instructions. However, it would be important for you the experiment with adding boundary conditions such as fixed state cells, heat sources, etc. to be sure that these initial conditions are realistic steady state conditions. 1. Create the model and set the top layer as a fixed state layer. Run the model for several years to establish a hydrostatic pressure gradient. 2. Save the SIM file with a new name (and in a new folder), and then load the SAVE file created during step 1 as Initial conditions 3. Select the layers for which you have desired temperatures and make them fixed state, with a constant pressure and temperature. You can select a cell from the layer to determine the pressure that you should assign to the layer. Its important for you to assign a constant pressure to each model layer. 4. You will need to lower the permeability of the material in the model to a very low value, otherwise, fluid movement caused by convection will created convection cells. 5. Run the model for a very long time (for example, 1m years), and you should end up with results that mimic the desired temperature gradient (with linear gradients in-between the fixed state layers. I hope that this helps. Again, this isn’t really the best way to do this, but if it might help speed up the modeling process. I think that the ideal way to establish these types of conditions would be for you to build a model that reproduces the process that created the conditions in the first place (for example, the instruction of heat sources or fixed T cells at the bottom of the model, combined with fixed state cells at the edges of the geothermal feature being modeled. This is the recommendation of the TOUGH2 authors. Best Regards, Alison
  4. Ellen, If you've loaded internal boundaries that define the stratigraphy, then each conceptual model layer in your model (you may only have one called "Default") should be divided into Regions based on the internal boundaries. If you can select a specific region in the layer tree on the left side of the screen, you can tell the program to hide cells outside of the region with a right click. You can then select all of the cells with the interbed material type, right click, and change the material properties for the group of selected cells. If you have any problems with this, feel free to send me your SIM file and I'll take a look. Thanks, Alison
  5. well parameters

    The wells in PetraSim are really just meant to identify the cells that are intersected by the well, and to apply the appropriate sources/sinks for each cell. This is not a true coupled well model, so the well radius and casing is not taken into account. If you choose the "well on deliverability" option for a production well, then the productivity index value does taking into account a well radius and skin factor. You can find more about this on page 64 of the TOUGH2 manual. The well model option (which can't be applied to wells, but can be applied to individual cells allows you to link to output from wellbore flow simulation, which would presumably take into account the well radius. This is documented on page 66 of the TOUGH2 manual. Thanks, Alison
  6. automate volume calcuations

    Lara, I think that the Block Model Grade Statistics By Level program should give you what you want (it is a quicker way to achieve Option 2 above). Please take a look at the documentation for this feature, and let me know if you have any questions. I think that we just recently documented this feature in RockWorks16. If you are still using RockWorks15, contact me via email and I can send you a link to some basic documentation in our revision list. Best Regards, Alison (Alison @ rockware.com)
  7. 3D result

    The only reason that I can think that this would be happening is if you have all of the cells in your model set to "fixed state". Its also possible that your model has reached steady state.
  8. Modflow Export

    In this paper, I believe that they used the Lithology / Surface Map tool to extract lithology data that intersected grid surfaces that mimics the geometry of the MODFLOW layers. The lithology grids were then exported as either XYZ text files, or Surfer grids, through the Grid / Export menu in the RockWorks Utilities. This paper references the Groundwater Vistas interface, but my guess is that you could use a similar process in GMS or Visual MODFLOW. Best Regards, Alison
  9. Unfortunately, RockWorks lost this functionality when we added transparency to the two dimensional graphics. We will consider adding a PDF export to the program in the future that will support both transparency and vector objects. For what is worth, your graphics are now editable in RockWorks (they were not in RockWorks99). I think that many of our customers now make edits to the diagrams directly in RockPlot2D, rather than taking them out to another program. Please let me know if you have additional questions about this. Best Regards, Alison
  10. 3D T-Data Statistics Map (RW15) - elevation issue

    Thanks for the explanation. Unfortunately, there is really no way to do this. I would recommend that you export the data for the sampling event to the Utilities and then model it through the Solid / Model menu (you can then delete any duplicate samples that you don't want to use). The other option would be to assign a very specific date (or maybe a date/time combination) to the samples that you want to use for the model. Please let me know if you have other questions. Thanks, Alison
  11. 3D T-Data Statistics Map (RW15) - elevation issue

    You would typically create a 3D model by going to T-Data -> Model. The statistics map is really designed for the creation of a 2D grid, which can be displayed as a contour map in 2D, or as a flat grid in 3D. When you say that you want to use the "highest values only", what exactly do you mean? Do you mean that you only want to use measurements above a specific concentration, or do you only want to use data that is screened above a specific elevation? Best Regards, Alison
  12. 3D T-Data Statistics Map (RW15) - elevation issue

    Mira, It sounds like you need to change the elevation at which the grid is being displayed. To do this, click on the 3-D Surface Options button. Choose the Flat option, and then specify an elevation within your project area for display. Best Regards, Alison
  13. 3D result

    I'm not quite sure if I understand your question. Are you seeing no change in these variables over time? Best Regards, Alison
  14. Error using PetraSim / TOUGH HYDRATE

    I would recommend that you take a look at the sample TOUGH-FX file that are posted on the PetraSim documentation page (these are posted under PetraSim v4). I am not able to post links on this website, so contact me via email, and I can send you a link to download these files. You may be able to reformat your output files fairly easily to match those that the program is expecting. If you'd like to send me an example of your input and output files, I'd be happy to take a look. We are hoping to add support for both HydrateResSim and TOUGH+/HYDRATE in future versions of the software. Thanks, Alison Alison @ rockware.com.
  15. Editing P-Data Types

    You should be able to simply delete the type Y from the P-Data Types table. To Access the Types table, view the P-data table and click on the P-data Types button displayed above the datasheet. Select the type Y cell with your mouse, right click and choose "Delete a Row". If there is any data still stored for this data type, you'll get a warning about deleting data before any modifications are made to the database. Please let me know if you have other questions. Thanks, Alison
  16. LAS Data loading

    During the import, you can tell the program to preserve the location information in the database, rather than pulling the location information from the LAS file. This is done in the in the last window of the import wizard, where the "Required Borehole Data" is displayed. To preserve the information stored in the database, right click in each location field (Easting, Northing, Elevation, etc.), and choose Read from Database. Please let us know if you have any additional questions. Best Regards, Alison
  17. Estimation of Mineral Resources

    The first step would be to determine the tons of material in a model cell. If you go to Solid / Statistics / Report, and run a statistical report on your solid model, the volume of a cell is listed at the Voxel Volume. You can convert this to tons by multiplying this number by the density of the material (presumably in tons/cubic feet or cubic meters). In the same solid model statistics report is a value titles the “Sum of all node values”. If you multiple this number by the tons of material in each cell, you’ll convert that sum from grams/ton to grams. I hope that this helps. Please let us know if you have questions. Thanks, Alison
  18. Tim, As long as you don't change the names or relationships of the existing fields, this should be fine. Please let us know if you have other questions. Best Regards, Alison
  19. Confined aquifer piezometric heads

    Hi Tim, I would typically recommend that you use the stratigraphy table to store the top and base of your hydro-stratigraphy. And then use the Aquifer table to store variations in the water level within the piezometers. Could you explain how you would want the piezometric heads to be displayed, if not with a water level symbol at the actual elevation of the water level in the piezometer? Would you want the symbols to always plot at the top of the aquifer boundary unless the aquifer is not completely saturated in the vertical direction? If you could provide some additional details about exactly how you would want the piezometric heads to display in the diagram, I can determine if it would be possible in RockWorks. Thanks, Alison
  20. Pitzer Ion Interaction Model

    The Pitzer model will be supported in a future version of PetraSim. We'll be sending out an announcement to our users once this is available. In the meantime, if you have purchased TOUGHREACT Pitzer from LBNL, the input files created by PetraSim could be used with the LBNL executable. Visualization of results wouldn't be possible in PetraSim unless you were to create the CSV files used by PetraSim for result visualization. You could create these by some post processing of the TOUGHREACT output files created by the simulator, or through some additions to the source code. If you'd like additional details about this, please let me know. Best Regards, Alison
  21. clip model extents

    Lara, There is still no way to resample the data without getting an average of the surrounding model nodes. So, I think that the idea of exporting the data to a list of XYZ values and re-interpolating the model is your best bet. I would recommend that you try using the closest point algorithm to do this. If you run into any problems, please let us know. Thanks, Alison
  22. Also, if you want the program to only take into account data within (or outside) of the polygon during interpolation, then you can do this in the Spatial Filters panel on the right side of most menus. Some of the modeling tools allow you to automatically clip a model based on the polygon after it is created (stratigraphy, I-Data/P-Data/T-Data). Other types of models, such as lithology and grids/models created through the Utilities, have to be clipped after they are initially created through the Grid/Filter or Solid/Filter menu. Thanks, Alison
  23. True Thickness

    Jack, You should enter the measured depth along the borehole. If the borehole is angled or deviated, then the program will use the survey information (stored in the Orientation table) to determine the true xyz location of contacts or samples. Please let us know if you have additional questions. Thanks, Alison
  24. Problem with XY Coordinate Table

    I'm not able to reproduce this using RockWorks15 or RockWorks16. What version of RockWorks are you using?
  25. Problem with XY Coordinate Table

    The problem is that you cannot have a ' character in the name of the XY Coordinate Table. If you recreate the table with a slightly different name (for example) Perf_B_B_Sector_1, does the program work correctly? Best Regards, Alison