I did the same project 2 years ago using the same software. But on that time I worked with 2D variogram (of coal thickness). I think there is no direct relationship between the range of vertical variogram with the clay thickness, if the variogram you used was related to the coal thickness.
OK made the "smoothing" in estimation result, that's why some parts of your intercalations were calculated as coal. This problem will be more clearly appeared if you have a nugget component in your variogram (of coal thickness). I think you can try to use other methods such as indicator kriging or conditional simulation. Cheers, Nur Heriawan http://www.mining.itb.ac.id/heriawan --- Tayfun Yusuf Yunsel <[EMAIL PROTECTED]> wrote: > Dear list members, > > I am studying on a coal reserve calculation using OK > procedure. I applied a > 3D grid design to the composited data. So I have a > horizontal and vertical > variogram (two range). The grid size in the vertical > direction is 4m and > vertical variogram range is 16m. There are > intercalations whose thickness > varies between 0.50-6m in the coal layer. In the > estimation process (OK), > the clay layers (intercalations) were calculated as > coal (due to clay > thickness < vertical variogram range). > > My question is that How can I seperate a thin > intercalation layer (according > to the coal layer (30-60m)) from the coal layer? > > Currently I am using the Isatis software. > > Thank you very much for your attention and time. > > > > Res. Assist. Tayfun Yusuf YÜNSEL > > Mining Engineering Department > Engineering Faculty > Cukurova University > 01330, Balcali, Adana > TURKEY > > > * By using the ai-geostats mailing list you agree to > follow its rules > ( see > http://www.ai-geostats.org/help_ai-geostats.htm ) > > * To unsubscribe to ai-geostats, send the following > in the subject or in the body (plain text format) of > an email message to [EMAIL PROTECTED] > > Signoff ai-geostats __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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