Сentral-Khoreyver Arch (Timan-Pechora Province) – formation of the Famennian reefogenic deposits

Matveeva, N. A.

doi:10.17353/2070-5379/16_2017

NGTP

2017

DOI: 10.17353/2070-5379/16_2017

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Сentral-Khoreyver Arch (Timan-Pechora Province) – formation of the Famennian reefogenic deposits

N. A. Matveeva¹

Abstract: Представлены результаты комплексного изучения фаменских рифогенных отложений Центрально-Хорейверского вала. Установлено, что литотипы фаменских карбонатных пород объединяются в пять парагенетических ассоциаций, характеризующих пять фациальных зон с литогенетическими и геофизическими особенностями. В течение фамена бассейн седиментации характеризовался частыми колебаниями уровня моря, фаций, солености вод и климата. Детализирована палеогеографическая ситуация в фаменском веке, отражающая сложный состав и строен… Show more

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Isotopic composition and conditions of formation of Famennian carbonatolites of the Central-Khoreyver arch (Khoreyver Depression, Pechora Plate)

Matveeva

2023

Vestnik of Geosciences

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The article presents results of the distribution of the isotopic composition of 13C and 18O (119 samples) across four facies zones to substantiate the conditions of Famennian carbonation accumulation. The Lower Famennian carbonates of the shoal zone showed values of 13C (1.5 ± 0.15 %), 18O (25.01 ± 0.29 %) reflecting evaporative processes in a shallow basin in a warm and dry climate. For the rocks of the microbial mounds zone, the values of 13C (2.47 ± 1.12 %) and 18O (23.51 ± 1.12 %) reflect an increase in bioproductivity and some fluctuation in water salinity. In the limestones of the zone of transition to depression, the variations of isotopic composition are more distinct in the section. Thus, the Early Famennian is characterized by the average values of 13C (0.94 ± 0.59 %) and 18O (23.73 ± 2.18 %) for marine carbonates. The transition to the Middle Famennian is accompanied by isotopic weighting of 13C (1.30 ± 0.47%) and 18O (24.52 ± 1.45%), which shows an increase in evaporation processes under aridization conditions. In the Late Famennian, the isotopic composition abruptly lightens by 13C (–1.05 ± 0.66 %), which is associated with desalination under conditions of climate humidification. At the same time, the value of 18O (25.75 ± 0.31 %) corresponds to the average values for carbonates of the Devonian. The values of 13C (1.04 ± 0.89 %) and 18O (26.01 ± 0.99 %) in the carbonates of the zone slope of the carbonate bank towards the shallow shelf reflect the conditions of the normal sea basin with a slight increase in the evaporation regime during climate aridization. The obtained results indicate that the Famennian sedimentation basin characterized by fluctuations in sea level, facies, water hydrochemistry and climate.

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Isotopic composition and conditions of formation of Famennian carbonatolites of the Central-Khoreyver arch (Khoreyver Depression, Pechora Plate)

Matveeva

2023

Vestnik of Geosciences

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Scientific justification of the perforation methods for Famennian deposits in the southeast of the Perm Region based on geomechanical modelling

Чернышов

Попов

Varushkin

et al. 2022

PMI

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The article presents the results of analysing geological structure of the Famennian deposits (Devonian) in the Perm Region. Numerical modelling of the distribution of inhomogeneous stress field near the well was performed for the two considered types of perforation. With regard for the geometry of the forming perforation channels, numerical finite element models of near-wellbore zones were created considering slotted and cumulative perforation. It is ascertained that in the course of slotted perforation, conditions are created for a significant restoration of effective stresses and, as a result, restoration of reservoir rock permeability. Stress recovery area lies near the well within a radius equal to the length of the slots, and depends on the drawdown, with its increase, the area decreases. From the assessment of failure areas, it was found that in case of slotted perforation, the reservoir in near-wellbore zone remains stable, and failure zones can appear only at drawdowns of 10 MPa and more. The opposite situation was recorded for cumulative perforation; failure zones near the holes appear even at a drawdown of 2 MPa. In general, the analysis of results of numerical simulation of the stress state for two simulated types of perforation suggests that slotted perforation is more efficient than cumulative perforation. At the same time, the final conclusion could be drawn after determining the patterns of changes in permeability of the considered rocks under the influence of changing effective stresses and performing calculations of well flow rates after making the considered types of perforation channels.

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Сentral-Khoreyver Arch (Timan-Pechora Province) – formation of the Famennian reefogenic deposits

Cited by 2 publications

References 2 publications

Isotopic composition and conditions of formation of Famennian carbonatolites of the Central-Khoreyver arch (Khoreyver Depression, Pechora Plate)

Isotopic composition and conditions of formation of Famennian carbonatolites of the Central-Khoreyver arch (Khoreyver Depression, Pechora Plate)

Scientific justification of the perforation methods for Famennian deposits in the southeast of the Perm Region based on geomechanical modelling

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