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Quirks and Quarks

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Loudmouth
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Message 6 of 86 (145759)
09-29-2004 5:12 PM 		Reply to: Message 1 by NosyNed
09-29-2004 1:43 PM

Ned,
​
Bill Birkeland covered this issue a while back in the Black Gold thread.
​
A quick snippet:
If the oil is coming from the mantle why is it only found in basins with organic-rich rocks suitable for the production of oil and gas and only in basins where these source rocks have been heated enough for oil and gas to have been distilled from these rocks? Also, why does the character of the oil always match the unique character of the organic-rich rock present within a basin? If oil is derived from the mantle, these relationships shouldn't exist at all and it should be found wherever geologic structures suitable for trapping oil exist. But, it isn't.
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 Message 1 by NosyNed, posted 09-29-2004 1:43 PM NosyNed has replied
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 Message 7 by NosyNed, posted 09-29-2004 7:57 PM Loudmouth has not replied
 Message 8 by Rei, posted 09-29-2004 8:02 PM Loudmouth has replied
  
Loudmouth
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Message 9 of 86 (146094)
09-30-2004 1:43 PM 		Reply to: Message 8 by Rei
09-29-2004 8:02 PM

quote:
Hmm... Bill knows a lot more about this sort of stuff than me. However, I don't think he is correct on this one. If he'd join this thread, I'd have to ask him about some of the granite fields that exist in the world (noone thought to look much in granite before, but more fields keep producing). For example, a number of Vietnam's fields (say, White Tiger) are from drilling basement granite.
​
Bill knows a lot more than me as well. If I remember correctly, you can find biomarkers in oil and trace them back to the organic layer that the oil originated from. That is, the characteristics of the nearest organic rich layer matches the oil found in the basement granite. If this is true for every oil well found in basement granite then I would think that an organic source is the best conclusion.
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