| Abstract: | Organic geochemical properties of the oil produced from the Lower Cretaceous O sandstone on the eastern flank of the Denver basin indicate that this oil has been derived from a different source rock than other Cretaceous oils in the basin. O sandstone oil is characterized by low pristane/phytane ratio, high isoprenoid/n-alkane ratios, high asphaltene content, high sulfur content, and slight predominance of even-carbon numbered n-alkanes in the C25+ fraction. These features are evidence of a Paleozoic source and indicate a carbonate rock is the likely source. Preliminary source rock evaluation and correlation data suggest that calcareous black shales and marls of Middle Pennsylvanian (Desmoinesian) age are the source of the O sandstone oil. This is the first reported occurrence of oil from Paleozoic source rocks in a Cretaceous reservoir in the Denver basin. -from Author |
| Genre: | Article |
| ProdID: | 70016032 |
| Citation Author: | Clayton, J. L. |
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| Citation End Page: | 988 |
| Citation Issue: | 8 |
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| Citation Language: | English |
| Citation Larger Work Title: | American Association of Petroleum Geologists Bulletin |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | Geochemical evidence for Paleozoic oil in Lower Cretaceous O Sandstone, northern Denver basin; 1989; Article; Journal; American Association of Petroleum Geologists Bulletin; Clayton, J. L. |
| Citation Start Page: | 977 |
| Citation Volume: | 73 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Geochemical evidence for Paleozoic oil in Lower Cretaceous O Sandstone, northern Denver basin; 1989; Article; Journal; American Association of Petroleum Geologists Bulletin; Clayton, J. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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