Rock Quality Designation (RQD)

[Guest Olafsson]

Hi,

I have a few boreholes where rock quality designation (RQD) of the core has been done.

The data looks like this:

% of core unfractured for 10cm/30cm/50cm/100cm/150cm/200cm

So what I have is a lithological section of a borehole where a RQD of 68/58/42/26/0/0 (for example) is defined.

I would like to make a 3d lithology model/stratigraphy model and be able to filter it using the RQD.

What is the best way to do this?

Thanks,

Olafsson

[Molly]

Hi Olafsson,

If you can enter your RQD data by depth interval into the I-Data table, you can then create a solid model of the RQD percentages. (I-Data | Model)

Then, filter that model for nodes that meet your RQD requirements, creating a Boolean (true/false) version of the RQD model. This Boolean model simply stores values of "1" for nodes that meet your requirements, or "0" for those that do not. (Utilities Solid | Boolean Operations | Boolean Conversion option.)

You can then multiply this true/false model with a lithology model or a stratigraphy model. The lith/strat nodes that whose corresponding RQD nodes = 1 will pass unchanged. Those nodes whose corresponding RQD nodes = 0 will be zeroed out. (Solid | Math | Model & Model). It's important that the models being multiplied have the same dimensions, both overall extents and node spacing.

Molly Mayfield

RockWare Inc.

[Guest Olafsson]

OK. Thank you Molly. I will try this.