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Re: Did Dinosaurs BECOME Oil?

On Mar 22, 12:26, Art Berggreen wrote:
} Subject: Re: Did Dinosaurs BECOME Oil?
> >
> >This is roughly correct.  There is some reason to suppose that oil
> >formation is still going on, for instance in the Mississippi Delta.
> I believe planktonic "oozes" in isolated ocean basins is a more likely
> environment.  I'm not sure what the percentage of organic matter in the
> delta is, but I'd suspect too much non-organic silt.

There's an awful lot of oil in the Mississippi Delta.  We (Unocal) do a lot
of oil drilling there.  I think a lot of organic material flows out of the
deltas in addition to the silt.

> >>From what little I have read, my impression is that oil mostly
> >forms from the degradation of microplankton when rapidly buried
> >and heated, as might happen in a major river delta.  I have not
> >heard any serious proposals for any other substantial source.
> Just change river delta to ocean basin and I fully agree.

I'm not on the geological side of the oil exploration business here at
Unocal, but I do know that we do a *lot* of oil drilling in major river
delta areas, like the Mississippi, the Mahakam (Indonesia), and the Chao
Phraya (Thailand) deltas.  Those are, in fact, our 3 most important oil &
gas fields. 

Oil migrates through the rock.  Yes, there's lots of silt, but the burial &
heating liquefies the oil & gas, and it migrates through porous rocks.  We
look for traps where it collects, which can be some distance from where it
was originally deposited.    This also has the effect of concentrating the
oil much more than the original hydrocarbon deposit was concentrated.

Bob Myers                         Unocal Tech. & Ops. I. S. Support
Internet: Bob.Myers@st.unocal.com P. O. Box 68076
Phone: [714] 693-6951             Anaheim, California  92817-8076