Variogram Analysis

Hello All,

Could any one please help me to get more information and/or books related to variogram and geostatistics analysis also i need to know if there is any software to make the variogram analysis

thank you very much

best regards

I have it.. trhee, but i will exchange for any software of blasting.

hello sadat666

which software you mean ??

Hello Sami22

If you want compute 2D variogran you can use variowin if 3D yo can use gslib both are free software. The very good book for undertand variogram is Introduction to applied geoestatistics by M. Srivastava. Other sofwares Wingslib, GOCAD and Petrel.

good luck

Thank you very much Viloriarj for this information, can you please tell me what is the difference between 2D and 3D variogram

Thanks

Hi Sami22

Depent of your data. For exemple if you have thikness, netsand, top, botton, average of porosity, or permeability of the resevoir the variogram have to compute in 2D, the data is X,Y and the value of properties (thikness, netsand, others). Now if you have porosity, permeability in a geological unit you have compute the 3D variogram. You data have X, Y at the location well, Z each 1 meter or feet

Dear Collegues,
I'm trying to build variogram model for existing lithoface grid using gam program from GSLIB distribution. I define indicator semivariogram as variogram output type:
[code]
Parameters for GAM
******************

START OF PARAMETERS:
18_face-region.txt -file with data
1 1 - number of variables, column numbers
-100 100 - trimming limits
gam.out -file for variogram output
1 -grid or realization number
100 50 100.0 -nx, xmn, xsiz
200 50 100.0 -ny, ymn, ysiz
1 0.25 0.5 -nz, zmn, zsiz
2 50 -number of directions, number of lags
1 0 0 -ixd(1),iyd(1),izd(1)
0 1 0 -ixd(2),iyd(2),izd(2)
1 -standardize sill? (0=no, 1=yes)
1 -number of variograms
1 1 10 2.5 -tail variable, head variable, variogram type


type 1 = traditional semivariogram
2 = traditional cross semivariogram
3 = covariance
4 = correlogram
5 = general relative semivariogram
6 = pairwise relative semivariogram
7 = semivariogram of logarithms
8 = semimadogram
9 = indicator semivariogram - continuous
10= indicator semivariogram - categorical
[/code]

When I run the program I've got zeroed columns in output
[code]
Indicator 1/2 Variogram tail:Indicator 1 head:Indicator 1 direction 1
1 100.000 0.00000 19800 0.00000 0.00000
2 200.000 0.00000 19600 0.00000 0.00000
3 300.000 0.00000 19400 0.00000 0.00000
4 400.000 0.00000 19200 0.00000 0.00000
5 500.000 0.00000 19000 0.00000 0.00000
6 600.000 0.00000 18800 0.00000 0.00000
7 700.000 0.00000 18600 0.00000 0.00000
8 800.000 0.00000 18400 0.00000 0.00000
9 900.000 0.00000 18200 0.00000 0.00000
10 1000.000 0.00000 18000 0.00000 0.00000
11 1100.000 0.00000 17800 0.00000 0.00000
12 1200.000 0.00000 17600 0.00000 0.00000
...
[/code]

Can you tell me what's wrong?

... ah, I see I give the wrong number for cutoff parameter in variogram type definition.

take this

[url]http://rapidshare.com/files/378427357/Practical_Geostatistics_1979_read_only.pdf.html[/url]

but for me the range of variogramm is the range of your geobodies normally i take double distance between the wells

[QUOTE=Sadat666;72079]I have it.. trhee, but i will exchange for any software of blasting.[/QUOTE]

Shame on you !!!!

[QUOTE=temr;93191]Shame on you !!!![/QUOTE]

Thanks term

hello...
can anybody share this book?
"Applied Geostatistics with SGeMS" by Nicholas Remy
Thanks..

Hi temr, the link does not work. Would you like upload again. I needed to learn it. I need some books to learn about geostatistics. Thank you for help