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UDC (554/.55:551.762.1/.2.02):550.83.05(571.16)
LITHOSTRATIGRAPHY OF THE LOWER AND MIDDLE JURASSIC DEPOSITS IN THE SOUTHEAST OF THE WEST-SIBERIAN PETROLEUM PROVINСE. A CASE STUDY FROM KALGACH MESOLEDGE AND ITS NORTHERN FRAMING
The study of the Lower and Middle Jurassic deposits in the southeast of West Siberia is resulted in identification of isochronous marker horizons of clays and coals occurring in the top of regional cyclites. The interval from the pre-Jurassic base up to U10 bed was layered. The designation of the regional cyclites was based on the number of a coal bed occurring in the top of the respective interval. The genetic relationship of sandy and coal layers within the cyclites is due to facies-phase and facies-cyclic deposition models – the alternation of rock complexes corresponding to the tectonic activation phases in base and tectonic quiescence phases in top. A principal stratification scheme of regional, zonal, and local cyclites was derived from detailed correlation of cross-sections. The author have identified structural and distribution features of regional cyclites J10−J17 laterally and in cross-sections. The J13, J14, and J15 cyclites are the most promising for oil and gas. There are alternating sandy reservoir rocks with oil saturation attributes and argillaceous sealing rocks.
Key words: petrography, sedimentary rocks, carbonaceous rocks, siliceous rocks, geophysical interpretation.
DOI 10.20403/2078-0575-2016-3-31-39
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