Distanova L.R.

lrdistanova@tnnc.rosneft.ru

Graduated from Lomonosov Moscow State University (2004), specialization "geology".
PhD in Geology and Mineralogy.
Chief Specialist of Tyumen Petroleum Research Center LLC (TNSC LLC).
Area of scientific interests: geology, sedimentology, lithology, seismics.
Author of 15 publications.
Regional petroleum geology
Article # 42_2023 submitted on 10/24/2023 displayed on website on 11/22/2023
19 p.
pdf Probable models of lithological composition within NB1 reservoir of Nizhneberezov sub-Formation
In the process of regional research activity within the Upper Cretaceous of the West Siberian Plate, the conditions and settings of sedimentation of siliceous formation (opoka) NB1 (Lower Berezov sub-Formation of Coniacian-Santonian age) were characterized. The results of laboratory tests of the cores showed an uneven distribution over the area of the ratio of amorphous (opal-cristobalite-tridymite) and crystalline (quartz) silica - the main components (in total up to 80-85% or more) in the composition of the siliceous formation, which is the result of the “aging” of amorphous forms (opal, opal-cristobalite-tridymite) silicium dioxide and converting it into crystalline quartz. It has been established that, all other things being equal, siliceous formation with a high content of quartz are characterized by improved permeability relative to siliceous formation with a high proportion of opal-cristobalite-tridymite phase. The process of gradual “aging” of siliceous formation, in fact, a stage-by-stage transition of amorphous silica into a crystalline form can occur regionally - as the sedimentary levels sinks and is covered by younger sedimentary rocks, under the influence of gradually increasing - temperature and pressure. In areas with an increased influx of deep heat (deep fault zones), the rate of crystallization of amorphous silica is relatively more intense. Within Western Siberia, zones of regional strike-slip faults (Trans-Eurasian and Turgay), rifts (the main zone is Koltogorsk-Urengoy) and rift-like structures have been established. The most likely additional heat source is zones of regional shear faults and feathering faults.

Keywords: Upper Cretaceous, Berezov sub-Formation, opal-cristobalite-tridymite, quartz, siliceous formation (opoka), Trans-Eurasian shear, Turgay shear, Koltogorsk-Urengoy rifts, West Siberian Plate.
article citation Nassonova N.V., Kudamanov A.I., Distanova L.R. Veroyatnye modeli differentsiatsii litologicheskogo sostava plasta NB1 nizhneberezovskoy podsvity [Probable models of lithological composition within NB1 reservoir of Nizhneberezov sub-Formation]. Neftegazovaya Geologiya. Teoriya I Praktika, 2023, vol. 18, no. 4, available at: http://www.ngtp.ru/rub/2023/42_2023.html EDN: JWGFXN
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