Copy mean, stdev and estimated facies probabilities to one realization of the geogrid

[oddvarlia]

The purpose of the new option -g is to copy the results (mean, stdev, facies prob estimates) from ertbox grid which is fixed and only works as a "container" for the values into a single realization (realization 0) of the geogrid. The argument for this is to be able to visualize the results together with blocked well facies log and petrophysical logs.

There are several things to notice here:

• Since the result is copied into a single grid realization, only the results for grid cells for that grid realization will be possible to see. But if we assume that the grid realization is based on a structural model conditioned to the wells, it should be possible to inspect the results along the well paths in the single realization.
• The statistical results are based on the main assumption that field values (facies, petrophysical values) belonging to the same grid cell index belongs to the same probability distribution regardless of the whether the geometry of the geogrid varies laterally or vertically from realization to realization.
• Since number of active grid cells vary from realization to realization, the confidence of the estimates of mean, stdev, facies probabilities will vary from grid cell to grid cell depending on how many realizations have the given grid cell as an active grid cell. Hence, for top or base conform grids this will vary a lot at the base or top of the zone. For grids with stair case faults, also along these faults the active grid cells will vary a lot and the number of realization for each grid cell index will vary from grid cell to grid cell around these faults.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.40506% with 6 lines in your changes missing coverage. Please review.

Project coverage is 85.91%. Comparing base (afef91f) to head (622524f).

Files with missing lines	Patch %	Lines
src/subscript/field_statistics/field_statistics.py	92.40%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #749 +/- ## ========================================== + Coverage 85.85% 85.91% +0.06% ========================================== Files 52 52 Lines 7245 7307 +62 ========================================== + Hits 6220 6278 +58 - Misses 1025 1029 +4 ```

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