Add SPE 2 dataset

[Mechtanium]

In this update,

I've added the long missing SPE 2 dataset: tested on the latest OPM Flow simulator (release 2025.10), SPE-2 adds a critical piece to the conversation of simulator design around the subjects of cusping and coning in near-well regions which will find new use in the new age of Neural Network inverse reservoir simulation studies.

It's my hope that many researchers find this as useful as I found it, necessitating the work to modernize and restore it.

[alfbr]

Thanks for the contribution! This is highly appreciated and I will do the review. We do need a copyright header with license on the DATA and INC file, just look at one of the other data sets for example. Please also post the pull request to opm-tests repository instead, as that is where the activity on the data sets are today.

[atgeirr]

Please also post the pull request to opm-tests repository instead

... or in addition to here! The opm-data repo is unencumbered by test result data and is therefore leaner and smaller, which is useful. I agree it would be good to have also in opm-tests though!

[bska]

This is very welcome and we should get it in. It represents a bit of a dilemma, however, because OPM doesn't really support radial grids (i.e., keyword RADIAL in the RUNSPEC section) and this means, as you've discovered, that the simulator does not know how to calculate the correct transmissibilities. I appreciate the effort to supply transmissibilities through the TRANX and TRANZ keywords in the EDIT section, but it also means we're limited to this exact setup until the simulator gains the ability to support radial grids.

To reiterate though, we definitely should get this in, but to @alfbr and @atgeirr: I think opm-data is the best location right now. We should postpone adding this into opm-tests until we actually support radial grids.