«Geology, geophysics and development of oil and gas fields»

Facies zoning and paleogeography for the Upper Jurassic deposits in the western part of the West Siberian oil and gas province

UDC: 553.98(571.1)
DOI: 10.33285/2413-5011-2023-7(379)-5-11

Authors:

¹ LUKOIL-Engineering LLC, Moscow, Russia

Keywords: the western part of the West Siberian oil and gas province, the Upper Jurassic deposits, carbonate reservoir, radiolarian layers, hard-to-recover oil reserves, computer data processing, paleogeography, facies zoning

Annotation:

The concept of developing a radiolarian reservoir in the Upper Jurassic deposits made it possible to organize their pilot development at the Sredne-Nazymskoye and Galyanovskoye deposits. The results of pilot development and a significant amount of new geological-geophysical data throughout the western part of the region served as the basis for updating the results of previous studies of the Upper Jurassic deposits in the western part of the West Siberian oil and gas province.

To solve the problem, an extensive geological-geophysical database was collected, a detailed stepwise correlation of the Upper Jurassic deposits was performed, structural maps and maps of total thickness were constructed, areas of wedging out of a part of the target deposits were mapped and well logging data were interpreted followed by the construction of maps of effective thickness. Based on the results of the lithological columns analysis, facies and paleo-geographic schemes were compiled, in which special attention was paid to the development of radiolarian layers – potential reservoirs.

According to the results obtained, the sites within the Frolovskaya megadepression as well as the Krasnoleninskiy: and Poluyskiy arches are recognized as the most promising ones. The least promising is the Shaim oil and gas region and the entire western area of work.

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