Some one with some extra time could download
File: 4969-06-NWNE.las NWNE 06-49N-69W from
http://www.minnelusa.com/sampledata.php
that is the
#31-6 Duvall 8420
and see what is the maximum porosity for the interval 8557 to 8590 feet.
With one method I
get 14% tMatric 54 usec/ft tFluid 200 usec/ft and with an other
method
17%

JL

I'm retired and don't have any software handy to handle the data. What are
you looking at. The Minnalusa is tricky stuff for log analysis if you
aren't familiar with the high dead oil (asphalt/heavy asphaltic oil) often
present. Upwards to 35 % sometimes.

RFF
Formerly
Flory & Associates Inc, Gillette Wyoming

Many years ago I worked > a project west of this area on the folds
(thrusts).
The highs had been drilled and pronounced dry until someone came along
with an air drill. The oil was very heavy with almost no gas pressure and
the drilling fluid on the first attempt forced the oil back into the
formation (theory).

I was working for Buttes out of Dallas at the time and was enthusiastic
about
the project but the production department was not saying there was
no refining available for the heavy oil.

Did you notice those very high resistivity readings? Thin coal
seams??

"Jean" <jean.lenior@wanadoo.fr> wrote in message
news:47cd0433$0$856$ba4acef3@news.orange.fr...

Many years ago I worked > a project west of this area on the folds
(thrusts).
The highs had been drilled and pronounced dry until someone came along
with an air drill. The oil was very heavy with almost no gas pressure
and
the drilling fluid on the first attempt forced the oil back into the
formation (theory).

Are we talking Powder River Basin Minnelusa here or overthrust?
I don't think I ever saw what could be called even slightly gasy Minnelusa
above 10,00 feet, never in the Duval Ranch Area. On the other hand that
area isn't really heavy oil either, just moderate PRB asphaltic crude.
Crook County, up the old "D" Road was heavy oil country. Except for the
stuff at 10K or deeper the Minnelusa is prety much water drive. Relative
viscosity makes coning a serious problem if you aren't careful.

I was working for Buttes out of Dallas at the time and was enthusiastic
about
the project but the production department was not saying there was
no refining available for the heavy oil.

I'm sure someone takes it. The old Amoco Refinery in casper is no more,
Newcastle never was very big though it did do a good business selling JP-4
to the Air Firce in South Dakota.

Did you notice those very high resistivity readings? Thin coal
seams??

No coal in the Minnelusa. Lots of hard dense dolomite, though. Nice sand,
I've seen it so porous (25+) it would wash out when you tried to core it.
That was the same stuff that flowed in on the "anchor" when you tested
water.

Take care when trying to do Minnelusa log interpretation if you don't have
someone who knows the area. There is often a lot of "Dead Oil" that will
screw up interpretation, even when you have moveable oil. I lost track of
the number of times clients let investors from south of Denver push them in

testing "Log Shows" and then couldn't understand why we got thousands of
feet of water and no oil.

At least with new technology the dry hole ratio isn't as high as it was in
the 90's.

Have fun and take care if you want to get into the Minnelusa.

Bob

Overthrust!!
It has been many years so my memory is some what blury! I'm not so much
interested in the Minnelusa but in the well data format. I wrote a
program
to load and evaluate data from the *.Las format and those example logs
were
available.
Just curious with the new (sky high) price of oil if those areas
(Overthrust) are now worth a re-look.

JL
The overthrust is too new to have had everything found. It's an expensive