Abstract
The specific sediment features in Georgiev (J3kmgr), Bazhenov (J3vbg) and Kulomzin (K1bkl) suites, exposed by drilling in the S-E Nurolsk depression (Tomsk Oblast), were defined and described via petrographic, X-ray diffraction and fluorescence-microscopy analysis methods. The classification of agrillites was identified, the structure-texture features, composition, voids and bitumen types and their distribution were determined. It was defined that Bazhenov suite argillites are characteristic of fine-dispersion, high biogenic silica content and scattered organic matter, enriched multi-composite syngenetic bitumen (from light to resin- asphaltine), as well as fractured surface where the migration of light bitumen occurs.
Highlights
Bazhenov suite bituminous sediments (Volgian-Early Berriasian) are today a relevant issue in terms of both the formation of source rocks [1, 3] and the potential production of shale gas and shale oil [5] within it
Target formation features and research methods Investigated Georgiev, Bazhenov and Kulomzin suite sediments were taken from the core depth interval of 2822.3–2795.0 m. in Western-Kvenzersk well No 4, located in similar local elevation in S-E Nurol'sk megadepression within the Central Nurolsk megadepression (WesternSiberian petroleum province, Pudinsk oil-and-gas region, Tomsk Oblast)
Redistribution of bitumen occurs within the Bazhenov formation, and via the bitumen migration path: bitumen migrates from Bazhenov suite argillites to underlying and overlying rocks in Georgiev and Kulomzin suites
Summary
Bazhenov suite bituminous sediments (Volgian-Early Berriasian) are today a relevant issue in terms of both the formation of source rocks [1, 3] and the potential production of shale gas and shale (light tight) oil [5] within it. According to the data [10], siliceous Bazhenov formation «black clay» is regarded as a source rock for more than 85 % of all oil reserves in the Western-Siberian basin. Bazhenov suite in studied area overlies Georgiev (Kimmeridgian) suite clays and is overlaid by Kulomzin (Berriasian) suite clays, involving gradation [6]. 2. Target formation features and research methods Investigated Georgiev, Bazhenov and Kulomzin suite sediments were taken from the core depth interval of 2822.3–2795.0 m.
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