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Wed, 22 Mar 2000 11:48:11 -0400 |
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Hi Devon and Dennis,
Indeed this situation has occurred before at Pacific Northwest National
Labs where they were using a dry, percussive drilling technique going down
to no more that 100-200 meters in relatively unconsolidated silts and
sands. As it was explained to me H2 apparently resulted from interactions
between the steel drill bits and formation water. The H2 even caused an
explosion. The person who would know the most about this is Phil Long at
[log in to unmask] Good luck, TCO
>Hi Devon,
>How's it going. Good to hear that you are still in the "gas business". I
>encountered a similar situation at a site in Colorado and was equally
>perplexed. We had several percent hydrogen and up to a couple hundred ppm
>of CH4. Our samples had been collected through the a hollow stem auger and
>it was in an area that was very hard drilling (actually broke a couple
>bits). The only explanation that we could come up with was that it was
>drill-stem metamorphosis. The H2 had a delta D value of about -600 but we
>were never able to get an isotopic analysis on the CH4. I am still
>perplexed by this problem and would really appreciate hearing any responses
>you get that are not on ISOGEOCHEM.
>Dennis
>
>Dennis D. Coleman
>Isotech Laboratories, Inc.
>1308 Parkland Court
>Champaign, IL 61821
>phone: 217-398-3490
>fax: 217-398-3493
>email: [log in to unmask]
>web page: www.isotechlabs.com
>
>> -----Original Message-----
>> From: Stable Isotope Geochemistry [mailto:[log in to unmask]]On
>> Behalf Of Devon Rowe
>> Sent: Tuesday, March 21, 2000 6:28 PM
>> To: [log in to unmask]
>> Subject: H2 in nature
>>
>>
>> Greetings,
>>
>> I am doing some work with gases in the Los Angeles Basin- specifically
>> looking at 13C isotope ratios of shallow gases from soils in
>> the vicinity of
>> some of the Los Angeles oil fields. I have found, quite
>> unexpectedly, that
>> there is a significant amount of hydrogen in most of our
>> samples collected
>> from less that 100 ft below surface. Up to 4% vol., and in most cases
>> methane is only present at ppm levels. Has anyone
>> encountered similar gas
>> systems who could point me toward some appropriate references
>> discussing
>> origin/migration pathways, etc?
>>
>> Thanks in advance,
>> Devon Rowe
>>
I HAVE A NEW WEB ADDRESS-SEE BELOW!!
T.C. Onstott
Dept. of Geosciences
Princeton University
Princeton, NJ 08544
Ph: 609-258-1622
Fx: 609-258-1274
e-mail: [log in to unmask]
Check out our website at http://geoweb.princeton.edu/geomicrobio/
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