lags. I think that for small
> lags (compared to geological layers or laminae thickness) you still
> have a positive correlation.or not?
> Sebas
>
>
>
>
> At 02.14 18/03/2009, Syed Shibli wrote:
>>Borehole logs of porosity or density can sometimes exhibit
>>a
Borehole logs of porosity or density can sometimes exhibit
anti-persistent behaviour, with more zero crossings around the
normalised trace.
On 3/17/09, seba wrote:
> Dear List members
> I received a lot of references from you and I was also lucky because
> last week I had the possibility to be at
Try Jens Feder's book "Fractals".
You can calculate the (omni) 2D variogram as per usual and plot it on
a log-log scale. The fractal dimension should be D=2-(S/2) where S is
the slope, and assuming the variable can be modelled using fractional
Brownian motion.
Syed
On Wed, Mar 11, 2009 at 8:34 A
Sorry to be nitpicky, but is that real CPU time or elapsed time (which is
what you've indicated)? The latter will be quite misleading if the CPU is
supporting other loads. Try this instead
clock_t t1=clock();
do_whatever_it_is_youre_doing();
clock_t t2=clock(
A strong nugget may be the exception rather than the norm for thickness
data. You can try cross-validating kriged thickness results based on some a
priori variogram model to see whether your estimates of thicknesses can be
improved using a spatial correlation model.
Syed
On 2/20/08, Peter Bossew
Try http://gstl.sourceforge.net/ which is the geostatistics template library
written in C++ and developed at Stanford. If you're not familiar with
objects and methods then it may be a struggle initially since C is
procedural. But the algorithms lend themselves well to the OOP paradigm.
Syed
On F
Generally arithmetic for flow parallel to the bed, harmonic for flow in series;
and geometric for homogeneous formations. These are all specific cases of the
power law averaging method for single phase flow.
For multiphase flow upscaling, God help you.
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A fractal model with exponent 1 reverts to just a linear interpolation. No need
for fancy kriging unless you want to derive the kriging variance.
Syed
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I think COSIM was compiled using an IBM supplied TIMER routine (Fortran IV).
Here is a link with code that calls F90/F95 timer routines.
http://orion.math.iastate.edu/burkardt/f_src/timer/timer.html
He'll have to modify it and rename the routine to TIMER or whatever is
convenient for his compil
application.
Every technique is a double edged sword, so I guess it is a question of "know what you're doing and when"!
Regards,
Syed Shibli
On 2 Oct 2006, at 23:42, Mario Rossi wrote:
Dear all,
The purpose of the paper (and also of this discussion) is to make people understand about a
Michael,
Carmen-Kozeny is the only attempt I know to relate particle size to permeability, backed by numerous experimental data. If you like glass beads then their formula is for you. There is also numerous empirical data looking at (log normal) distributions of pore sizes, which effectively relat
Michael,
Looking at the plots you mentioned, I doubt that you'd ever get a straight line
at high saturations purely because of the presence of the capillary transition.
I am thiking that straight line (relative) conductivities will only be
discernable at 100% saturation of any one phase, and w
May I suggest that you look at other analogous datasets with n > 25, e.g. the
North Sea basin or Gulf of Mexico, before making some firm conclusions about
whether Pareto or Lognormal works best. A lot of this information is in the
public domain, one can browse the Websites of the UK DTI, Norweg
Have a look at Alexis Brandeker's pages (specifically his MSc thesis), among
many on the Internet with sources for generating multidimensional fBm (power
law) distributions, including multifractals.
The link is http://www.astro.su.se/~alexis/. You may want to write him for the
C code.
The 1D
have learnt a tremendous amount from the various participants
around the world (an have co-authored papers with colleagues I have yet to meet
in real life, thanks to the power of the Net).
Here's to another decade (or two, or three) of geostatistical discussion!
Cheers,
Syed Shibli
Abe
On Monday, September 10, 2001, at 12:19 PM, Isobel Clark wrote:
> Any basic Geostatistics book will show you models with
> varying ranges and sills with direction.
>
> Except mine. We believe that sill varying with
> direction is a symptom of deeper problems such as
> non-stationarity, trend, d
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