Residual Water Saturation of Source Rocks of the Bazhenov Formation Western Siberia, Russia

2021 ◽  
Author(s):  
Anton Vasilievich Glotov ◽  
Anton Gennadyevich Skripkin ◽  
Petr Borisovich Molokov ◽  
Nikolay Nilovich Mikhailov
Keyword(s):  
Western Siberia ◽  
Water Saturation ◽  
Source Rocks ◽  
Rock Properties ◽  
Low Permeability ◽  
Residual Water ◽  
Bazhenov Formation ◽  
Rock Formation ◽  
Low Permeability Reservoirs ◽  
Significant Underestimation

Abstract The article presents a new method of determining the residual water saturation of the Bazhenov Rock Formation using synchronous thermal analysis which is combined with gas IR and MS spectroscopy. The efficiency of the extraction-distillation method of determining open porous and residual saturation in comparison with the developed method which are considered in detail. Based on the results of studies in the properties of the Bazhenov Rock Formation, a significant underestimation of the residual water saturation in the existing guidelines for calculating reserves was found, and the structure of the saturation of rocks occurred to be typical for traditional low-permeability reservoirs. The values of open porous and residual water saturation along the section of the Bazhenov Formation vary greatly, which also contradicts the well-established opinion about the weak variability of the rock properties with depth.

scholarly journals Integrated petroelectrical models of devonian limestones and cambrian sandstones from Dobrotvirska area of Volyno-Podilia

2014 ◽  
pp. 25-30
Author(s):  
S. Vyzhva ◽  
D. Onyshchuk ◽  
N. Reva ◽  
V. Onyshchuk
Keyword(s):  
Water Saturation ◽  
Laboratory Data ◽  
Effective Porosity ◽  
P Wave ◽  
Rock Properties ◽  
Residual Water ◽  
Specific Resistivity ◽  
Filtration Method ◽  
Reservoir Rocks ◽  
In Situ Conditions

This paper deals with the technique and results of research into petroelectrical properties of complex terrigenous and carbonate reservoirs. Analyzed are electric data and their relation to capacity properties of Devonian limestones and Cambrian sandstones from Dobrotvirska area of Volyno-Podilia. The objective of the research was to build petroelectrical models of reservoir rocks based on the electrical parameters and their relation to capacity properties. Data on specific resistivity of reservoir rocks were used for specifying the range of its variation for different types and groups of rocks. These data were also essential for identifying the stratigraphic horizons, cross-sections and facies, as well as finding the relationship between specific resistivity and a range of factors such as mineral composition, pore structure, substance phase ratio, electric field intensity and frequency, and resistivity variations with epigenetic transformation and metamorphic changes in rocks. Laboratory data on electrical resistivity of rocks made it possible to interpret the results of employing electrometric well logging methods and electric exploration. Petrophysical laboratory data enabled us to determine the following properties: rock density (dry and saturated with synthetic brine), effective porosity (nitrogen and synthetic brine saturation methods), residual water saturation factor (by centrifugation), permeability (nitrogen stationary filtration method), interval time (P-wave velocity) and resistivity. There were obtained laboratory data on specific resistivity of rock samples (dry, partly and fully saturated with synthetic brine) in atmospheric and in simulated in-situ conditions. We estimated the petroelectrical parameters of Cambrian sandstones and Devonian limestones from Dobrotvirska area to find an empirical correlation between petroelectrical parameters, porosity and permeability of the studied rocks. The correlations are mainly approximated by power function and serve as the basis for geological interpretation of geophysical data. Electrometric methods have proved to be a powerful tool in both laboratory and field rock studies, being efficient enough to provide extensive information on rock properties.

scholarly journals ASSESSMENT OF THE CONDITION OF THE NEAR-WELLBORE ZONE OF REPAIRED WELLS BY THE SKIN FACTOR

2021 ◽  
Author(s):  
Sudad H AL-Obaidi ◽  
Chang WJ ◽  
Patkin AA
Keyword(s):  
Western Siberia ◽  
Oil And Gas ◽  
Skin Effect ◽  
Objective Assessment ◽  
Oil Production ◽  
Low Permeability ◽  
Formation Zone ◽  
Production Wells ◽  
Exploration And Production ◽  
Low Permeability Reservoirs

Production wells that have penetrated low-permeability reservoirs do not provide adequate oil production due to the degraded condition of the near-wellbore zones of the reservoir. Objective assessment of the condition of the near-wellbore formation zone of exploration and production wells by determining the magnitudes and values of skin effects using well tests allows timely implementation of measures to increase the productivity of wells and oil production.In this article, the following aspects of difficult-to-recover oil production were examined:- The analysis of the dependence of well productivity on the magnitude and significance of the skin effect, in order to assess the condition of the bottomhole formation zone for further planning and implementation of oil and gas inflow stimulation measures;- The influence of the magnitude and significance of the skin effect on the condition of the bottomhole formation zone on the experience of developing exploration wells penetrated into low-permeability formations in the fields of Western Siberia;- Criteria (based on the value and magnitude of the skin effect) for selecting methods of stimulating the bottomhole formation zone to increase the productivity of low-rate wells.

JUSTIFICATION OF THE RESIDUAL WATER SATURATION OF THE RESERVOIRS BASED ON THE DATA OF DIRECT CORE STUDIES

2020 ◽  
pp. 28-34
Author(s):  
I.S. Putilov ◽  
◽  
I.P. Gurbatova ◽  
S.V. Melekhin ◽  
M.S. Sergeev ◽  
...  
Keyword(s):  
Water Saturation ◽  
Residual Water

ASSESSMENT OF OIL WELL PRODUCTIVITY IN LOW-PERMEABILITY RESERVOIRS IN THE FIELDS OF EASTERN SIBERIA

2017 ◽  
pp. 30-36
Author(s):  
R. V. Urvantsev ◽  
S. E. Cheban
Keyword(s):  
Oil Recovery ◽  
Large Scale ◽  
Oil And Gas ◽  
Oil Extraction ◽  
Low Permeability ◽  
Oil Well ◽  
Eastern Siberia ◽  
Development Costs ◽  
Traditional Fields ◽  
Low Permeability Reservoirs

The 21st century witnessed the development of the oil extraction industry in Russia due to the intensifica- tion of its production at the existing traditional fields of Western Siberia, the Volga region and other oil-extracting regions, and due discovering new oil and gas provinces. At that time the path to the development of fields in Eastern Siberia was already paved. The large-scale discoveries of a number of fields made here in the 70s-80s of the 20th century are only being developed now. The process of development itself is rather slow in view of a number of reasons. Create a problem of high cost value of oil extraction in the region. One of the major tasks is obtaining the maximum oil recovery factor while reducing the development costs. The carbonate layer lying within the Katangsky suite is low-permeability, and its inventories are categorised as hard to recover. Now, the object is at a stage of trial development,which foregrounds researches on selecting the effective methods of oil extraction.

scholarly journals Types of Void Space in the Bazhenov Reservoir Rocks

Geosciences ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 269
Author(s):  
Olga V. Postnikova ◽  
Alexander V. Postnikov ◽  
Olga A. Zueva ◽  
Artem E. Kozionov ◽  
Ekaterina V. Milovanova ◽  
...  
Keyword(s):  
Western Siberia ◽  
Distribution Patterns ◽  
Void Space ◽  
X Ray Diffraction ◽  
Bazhenov Formation ◽  
Reservoir Rocks ◽  
Oil Reserves ◽  
Light Oil ◽  
Clay Rocks ◽  
High Degree

The deposits of the Bazhenov formation are a unique reservoir of unconventional oil reserves in Western Siberia. They contain both solid organic matter (kerogen) and liquid light oil. The successful development of these hydrocarbons is largely determined by the adequacy of the void space models. The aim of the study is to identify the types of void space in the sediments of the Bazhenov formation and to identify the distribution patterns across the section of the researched wells. The void space was studied by electron and optical microscopy, and the mineral composition of the rocks was determined by X-ray diffraction analysis. The deposits of the Bazhenov productive formation in the territory of Western Siberia are represented by a wide complex of lithotypes, including various kinds of silicites, carbonate, clay rocks, and mixtites. The reservoir space in the reservoir rocks of the Bazhenov formation is a complex and hierarchically subordinated system, which includes voids and fractures of various sizes, configurations, and genesis. The void space of the Bazhenov formation is characterized by a fairly high degree of spatial heterogeneity, which is controlled by lithological, facies, and tectonic factors, as well as the direction of catagenetic processes.

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