Fresh and Altered Clay

[estriz]

I am looking at some driller's logs from old (70s) well completion reports. They desrcibe layers of altered clay and also layers of fresh clay. Can someone explain what those descriptions mean?

 

[emmgjld]

Please, A little more information.
What part of the country/world is this from?
Is this a domestic type (potable)water well?
Was the driller a specialty-type? Water well, mineral exploration, etc???
Does the altered or fresh clay seem to describe alluvial sediments or rocks (formational units)?

 

[estriz]

The driller's log is a potable water well in the Lebo Member of the Ft Union formation in the Powder River Basin in Wyoming. It is an alluvial sandstone/siltstone deposit with coal seams. These descriptions are within the first 300 ft bgs. Thanks.

 

[fattdad]

the driller can - sorry to be so glib. Driller's logs can be quite random. It'd be hard to guess, but the local drillers would be able to answer this question.

f-d

¡papá gordo ain’t no madre flaca!

 

[TDAA]

Perhaps one is baked by mine fires? Would be good to ask a local driller if they know the terms.

Also you may be able to narrow down the area you are looking at here:

http://ngmdb.usgs.gov/ngmdb/ngm_PNsearch.html