The main rock types of the Bazhenov formation on the Surgut arch and adjacent territories

• Published in: Georesursy
• Main Authors: O.M. Makarova, N.I. Korobova, A.G. Kalmykov, G.A. Kalmykov, N.S. Balushkina, V.S. Belokhin, E.V. Kozlova, V.L. Kosorukov, E.A. Manuilova
• Format: Article
• Language: English
• Published: Georesursy Ltd. 2017-05-01
• Subjects: Bazhenov Formation; classification of rock; types of rocks
• Online Access: https://geors.ru/archive/article/846/

As a result of long-term studies of the Bazhenov Formation sediments a classification of rock types based on the results of macro- and micro-study of core material, confirmed by the results of X-ray diffraction and X-ray fluorescence analyzes and pyrolysis,was proposed. The classification was based on the following structural-tectonic zones: the Surgut arching, the Salym megaswell, the Tundrin depression, the Malobalik mega anticline and the North Vartov mega-terrace. Among the studied sediments of the Bazhenov formation there are types of rocks that differ in their component composition and structural features. The ratio of the following components was taken for determining rock types: siliceous, clayey, carbonate minerals, andkerogen. In the presented classification scheme, the rock-forming component is the one whose content in the rock exceeds 10%. Thus, there were determined pure differences – silicites and carbonates (limestones and dolomites) and mixed (siliceous) rocks with different content of syngenetic siliceous substance: clay-siliceous, siliceous-argillaceous, carbonate-siliceous, siliceous-carbonate, clay-carbonate-siliceous with variable content of mineral components. In addition, separate types are isolated in silicites, limestones and dolomites on the basis of their structural features. According to the content of kerogen, the rocks were divided into low-carbon (kerogen content less than 10%), high-carbon (kerogen 10-25%) and kerogen (more than 25% kerogen) types.