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Re: GEOSTATS: Sampling.Grid

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  • Syed.R.Syed@EXXON.sprint.com
    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
    Message 1 of 3 , Jun 10, 1997
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      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.

      Regards, Syed

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