Objective:
The user wants to create a GM where the fault will not affect all the units.
Resolution:
The general workflow (building faults from the fault system in the GM) will lead the fault to terminate against the GM boundary (https://help.seequent.com/Geo/2021.1/en-GB/Content/faults/faults.htm).
This can be changed in three ways:
1) Terminate the faults on specific units
This can be done by editing the fault blocks so the unit(s) not affected by the fault appear(s) as seamless as possible in between blocks.
Once the faulted GM has been created, you can select the data used to build the lithology within each block by editing the boundary filtering.
– For units not affected by the faults, you need to turn off the filter so all the input data is used to build the surface and it will appear as if there was no offset from one block to another.
To do so, in the surface chronology double-click on the surface you want to edit. In the dialog window, select “Surfacing”; next to “Boundary filter” you can choose how you want to manage the data to create the unit. In this case, you will choose “Off” so the data are not filtered and the surface will be created using all the data present in the GM.
Please, keep in mind that there will be cases where there are other types of data (polyline, structural disc, GIS data, etc) existing in the sub-blocks that make up your GM. You might want to exclude/include them to make the surface look like you want. To do so you will choose “Custom” from the Boundary filter and go to the “Inputs” tab where you can tick the data you want to filter (only the one in the block will be used).
– For units affected by the fault, the data within the fault block need to be used: that is the default boundary filter: Filter “All Data”;
To get more details, you can refer to this article here: https://help.seequent.com/Geo/2021.1/en-GB/Content/faults/edit-fault.htm .
2) To create a finite fault (usually accompanied by a relay ramp)
A workflow exists in the Learning portal where one can build finite fault: https://my.seequent.com/learning/3841/3842/3843
However, please note that this workflow might not suit your need if you need to play with the filter. The GM will only be separated into 2 blocks (cf. picture below).
If you would like to obtain 4 different blocks to have more flexibility with the boundary filter, you can follow the steps below:
Create the meshes that correspond to your faults (https://my.seequent.com/learning/3841/3844/3848) as well as an extra fault that will be used to terminate the actual faults. This will allow getting 4 different fault blocks (cf. below). To do so you will have to use the fault system tab to terminate the faults as it suits your model.
Once this has been done, please, right-click on drillholes in the project tree > New evaluation:
Click right on the drillholes and select “New merged table” drag the newly created merged table and the base lithology in the selected columns.
On the newly merged table create a filter: double-click on the merged table in the project tree and click “Query” at the top left of the table, then click “Build Query”. Choose the option “Any of the following”.
Then select the options as below (it corresponds to the block presented above)
Click apply and save the filter under a convenient name.
Then, when you create the surface chronology in fault blocks 2 and 4, please, use other contacts settings. A new depositional contact window opens, please select the surface needed as well as the newly created data (from the merged table).
In the next window, you will need to select a query filter, so the data used are the ones from the newly created filter (untick inherited from GM to do so).
Choosing this workflow when creating the surface chronology will allow the GM to act as if it was separated into 3 fault blocks: block 1, block 2-4 and block 3.
You can then play around with the boundary filter.