Talk:Siljan (lake)

From Wikipedia, the free encyclopedia

	This article is within the scope of WikiProject Physics, which collaborates on articles related to physics.	Physics Portal
???	This article has not yet received a rating on the assessment scale. [FAQ]
???	This article has not yet received an importance rating within physics.
Help with this template Please rate this article, and then leave comments here to explain the ratings and/or to identify the strengths and weaknesses of the article.

	The article on Siljan (lake) is supported by WikiProject Sweden, which is an attempt to improve the quality and coverage of Sweden-related articles on Wikipedia. If you would like to participate, you can visit the project page; if you have any questions about the project or the article ratings below, please consult the FAQ.
Start	This article has been rated as start-Class on the quality scale.
Mid	This article has been rated as mid-importance on the importance scale.

[edit] Oil seeps

If anyone's watching this....can you confirm if there are ANY reports of oil seeps in the Siljan Ring? You can report this over at abiogenic petroleum origin or my talkpage as it would help greatly in resolving some of the weird shite going around there, namely in conjunction with

• Nikolai Kudryavtsev
• etc

Rolinator 15:15, 3 March 2006 (UTC)

I can only find that drillings for oil were made near lake Siljan in 1869 , but they only found water [1].

Here is a book reference: Boden,A., Eriksson,K.G. (1988). The Deep Gas Drilling in the Siljan Impact Structure that I found on [2]. Maybe that's of interest?

Fred-Chess 17:17, 3 March 2006 (UTC)

Full title is Deep drilling in crystalline bedrock: Proceedings of the international symposium held in Mora and Orsa, September 7-10, 1987, Volume 1:The deep gas drilling in the Siljan impact structure. Volume 2 is on other topics. (SEWilco 03:39, 15 August 2006 (UTC))

Cheers. Siljan was drilled in 1976, to answer Thomas Gold's abiogenic origin of petroleum theory. It was proposed as the best site to test the theory because it was a ~300Ma old meteorite craer infilled with sediments which were not mature enough to generate biogenic oil. A 7.5km deep borehole was completed and found only 8 barrels of an oil-like substance later found to be diesel contmination of the drilling muds. I had not, however, heard of oil seeps, and it appears this is a myth. Rolinator

"Some 15 tons of oil were pumped up," [3] And with a quick look I found two mentions of Siljan oil seeps. [4][5] (SEWilco 06:55, 14 August 2006 (UTC))

Hi - I have done a lot of geological field work in the area, and yes, there are oil seeps in the Siljan area, but not of abiological origin. Oil seeps can be found in the limestone quarries, especially in the old Solberga quarry on the eastern side of the impact structure. Vlierboon et al. (1986) concluded that the oil matured as a consequence of the residual heat of the impact event, and the soucre rocks were probably local shales (even though it can't be excluded that the limestone itself acted both as a source rock and reservoir). The amount of oil is clearly small, and it is of no commercial interest. /Tomas Hode, PhD.

Reference: Vlierboom, F.W., Collini, B. and Zumberge, J.E., 1986. The occurrence of petroleum in sedimentary rocks of the meteor impact crater at Lake Siljan, Sweden. Advances in Organic Geochemistry, 10, 153–161.