Re: GEOSTATS: Sampling.Grid
- Michael Pickering's questions refer (i.e. using sampling interval
proportional to bed thickness):
1. It's good to be familiar with: (a) what the end result will be used
for; and, (b) what scales of heterogeneity will most impact that
end result. E.g. in a petroleum deposit, lamina scale heterogeneity
may or may not impact a fluid flow process, therefore sampling must
take into account this knowledge, regardless bed thickness.
2. It's even conceivable that a smaller bed might not show as much
heterogeneity as a thicker bed, i.e. due to erosion of part of the
smaller bed. That thicker bed might show varying scales of
heterogeneity which the sampling should try to capture as much as
possible. Some intuitive decisions need to be made.
3. Re: (1) and (2) above, I suggest that the sampling scheme be based
on some sound subjective (geological) understanding of the phenomena,
and a knowledge of the impact of the eventual description on whatever
transfer function will be applied (whether fluid flow simulation or
otherwise). The problem isn't as tractable as it "seems" no matter
how statistical you want to make it.
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