Biomarkers in crude oils of the eastern Siberian Platform as indicators of paleoenvironment of source-rock deposition
Kashirtsev, VA; Kontorovich, AE; Philp, RP; Chalaya, ON; Zueva, IN; Memetova, NP
| HERO ID | 4969225 |
|---|---|
| In Press | No |
| Year | 1999 |
| Title | Biomarkers in crude oils of the eastern Siberian Platform as indicators of paleoenvironment of source-rock deposition |
| Authors | Kashirtsev, VA; Kontorovich, AE; Philp, RP; Chalaya, ON; Zueva, IN; Memetova, NP |
| Journal | Geologiya i Geofizika |
| Volume | 40 |
| Issue | 11 |
| Page Numbers | 1700-1710 |
| Abstract | Computerized gas chromatography-mass spectrometry of biomarkers in crude oils of East Siberia (eastern Siberian Platform, Nepa-Botuobiya dome) permitted revealing different types of primary organic matter on the basis of biochemistry and deposition environment, which correspond to a number of successive oil and gas sources. <br> <br>All commercial Upper Proterozoic and Lower Cambrian oils of the study region are rich in 12-13-monomethylalkanes, tricyclic heilanthanes, and homohopane C-35 as compared with lower homolog C-34. This oil family, apparently, originates From plankton- or bacteria-derived organic matter buried in anoxic basins favorable for preservation of homohopane, among Riphean and Vendian carbonate, carbonate-argillaceous (as evidenced by scarce or absent diasteranes), and carbonaceous silts on the passive margin of the Siberian craton. <br> <br>The Upper Permian and Mesozoic oils of the Vilyui basin show fairly high contents of diasteranes and rearranged hopanes (17 alpha(H)-diahopane and 18 alpha(H)-norneohopane), possibly originated from bacterial precursors which were oxidized and rearranged by acidic clay catalysis. The presence of diasteranes and diahopane attests to terrigenous (and possibly, coaliferous) source rock deposited, mast likely, in Permian fluvial, lacustrine, and marshy environments. <br> <br>Considerable amounts of gammacerane, squalane, and pregnane in the Permian oils of the Yuzhno-Tigyanskoe deposit (Anabar-Khatanga saddle) are indicative of hypersaline environment of source-rock deposition. The oil may have been genetically related to Devonian salt-bearing deposition of the Lena-Anabar basin. |
| Wosid | WOS:000084406900015 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | crude oil; biomarkers; source rock; organic facies; Siberian Platform |