Lithology of Callovian-Oxfordian deposits in various facies of the West Siberian Plate
Lithology of Callovian-Oxfordian deposits in various facies of the West Siberian Plate
Russian Geology and Geophysics (December 2001) 42 (12): 1806-1816
- Asia
- Callovian
- cement
- chemical composition
- clastic rocks
- Commonwealth of Independent States
- Irtysh River
- Jurassic
- Khanty-Mansi Russian Federation
- Kheta River
- Krasnoyarsk Russian Federation
- Mesozoic
- Middle Jurassic
- mineral composition
- mudstone
- Oxfordian
- paleoenvironment
- petroleum
- petroleum exploration
- regression
- reservoir rocks
- Russian Federation
- sandstone
- sea-level changes
- sedimentary rocks
- Siberian Lowland
- siltstone
- Tomsk Russian Federation
- trace elements
- transgression
- Tyumen Russian Federation
- Upper Jurassic
- well logs
- West Siberia
- Yamal-Nenets Russian Federation
- Pur River
- Vasyugan Formation
- Abalak Formation
- Nadym River
- Ob River basin
- Naunak Formation
- Nadym-Taz Interfluve
- Taz River
- Tochino Formation
- Sigovsk Formation
The Callovian-Oxfordian deposits of the Pur-Irtysh, Taz-Kheta, and Sil'ga facies districts of West Siberia are considered, with emphasis placed upon their structure and composition as well as conditions of formation. In the first of them, the Callovian-Oxfordian deposits include the Vasyugan and Abalak Formations; in the second, the Tochino and Sigov Formations; and in the third, the Naunak Formation. Lithological and mineralogic-petrographical studies invoking well logging, geochemistry, and paleontology showed a difference of the Vasyugan Formation in the southeastern areas of the West Siberian Plate, in the mid-Ob' region, and the Nadym-Taz interfluve. Thus, three facies subdistricts are recognized: Ob'-Tara, Ob'-Agan, and Nadym-Pur. In addition, the Yamal-Nadym facies subdistrict, where the Abalak Formation occurs, has been recognized.
