Structure and Changes in Reservoir Properties of Bobrikovskian in Visean Incisions (on the Examples of Melekess Depression Deposits)

Valeeva, S.E.; Baranova, A.G.; Uspensky, B.V.

doi:10.18599/grs.58.3.8

Cited by 3 publications

(2 citation statements)

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“…At present, their share in oil production at Tatarstan Republic is approaching 30% [6]. The main hydrocarbon reserves are concentrated in the Visean erosion cuts up to 30 m deep, filled with fine-grained alluvial sandstone of the Bobrikian age [7][8][9][10]. However, on the slopes of the South Tatar arch and the eastern side of the Melekess depression, in the terrigenous complexes of the Bobrikian horizon, there are also scattered sandstone beds.…”

Section: Introductionmentioning

confidence: 99%

Reservoir oil deposits in terrigenous complexes of the Bobrikian horizon of the western slope of the South Tatar arch

Королев

Ескин²,

Korolev³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Oil-bearing terrigenous sections of the Bobrikian horizon of the western slope of the South Tatar arch are considered. It has been established that all oil deposits are confined to thin layers of quartz sandstones screened by dense clayed siltstones and argillites. The sandstones were formed in the coastal-shallow conditions of a desalinated epicontinental marine basin during the active removal of clastic material from the coast of the continent. Similar conditions of accumulation caused a large areal distribution of fine-grained sandstones with a consistent thickness along the lateral. During the period of migration of water-oil fluids, calcite cement was leached from sandstones, due to which their porosity increased to 20-25%, the permeability reached 243.0-359.0 mD. Oils in sandstone reservoirs are characterized by an increased content of light and medium fractions of hydrocarbons, the content of heavy hydrocarbons does not exceed 15-20%. Despite the fact that, according to the results of geophysical studies, the rocks are classified as unpromising, weakly oil-bearing, commercial oil flows are obtained from them in a several of oil-bearing structures.

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Section: Introductionmentioning

confidence: 99%

Reservoir oil deposits in terrigenous complexes of the Bobrikian horizon of the western slope of the South Tatar arch

Королев

Ескин²,

Korolev³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Форма и характер сейсмической волны часто используются для характеристики качества коллектора. Это связано с тем, что форма сейсмической волны несет информацию о фазе, частоте и амплитуде -и любое изменение этих параметров считается отражением изменения литологии, пористости и типа флюида [1]. Можно использовать классификацию формы волны для оценки толщины пласта в межскважинном пространстве [3].…”

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Evaluating the thickness of thin-bed seams using seismic data on the example of the Tula-Bobrikovian sediments in the Republic of Tatarstan

Platov

Хайрутдинова

Кадиров

2021

Izvestiya Vysshikh Uchebnykh Zavedeniy. Geologiya i Razvedka

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Background. Determining the productive deposit thickness is of fundamental importance for assessing the reserves of oil and gas fields. 3D seismic data is used to assess the thickness of seams in the interwell space. However, owing to the limited vertical resolution of seismic data, estimating thicknesses of thin deposits (less than 20 m) is challenging.Aim. To evaluate different approaches to calculating the thickness of the productive deposits based on seismic data with the purpose of selecting the most optimal approach.Materials and methods. We compared the results obtained using different approaches to assessing the productive deposit thickness of the Tula-Bobrikovian age in the interwell space, including the convergence method (calculating the thickness for oilwells with no seismic data used), the use of seismic attributes to calculate the “seismic attribute — reservoir thickness” dependency (for attributes, dominant frequency and mono-frequency component at 60 Hz), estimation of the thickness from the seismic signal shape. Cokriging was used to calculate inferred power maps from seismic attribute data and to classify them by waveform. For each of the techniques, the crossvalidation method and calculating the root-mean-square deviation were used as quality criteria.Results. When assessing the accuracy of thickness map development, the root-mean-square deviation was 12.3 m according to convergence method, 10.2 m — to the dominant frequency attribute, 7.2 m — to the attribute of the monofrequency component at 60 Hz and 6.3 m — to the signal shape classification. The latter method yielded the best results, and the developed thickness map allowed paleo-cut to be traced.Conclusions. Applying the thickness estimation method based on the seismic signal shape allows the value of the root-mean-square deviation to be reduced by a factor of 2 compared to that of the widely adopted convergence method. This approach permits productive deposits thickness to be more accurately estimated and hydrocarbon reserves to be determined.

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Assessment of the prospects for oil-bearing deposits of the Visean stage of the Western Zakamya region at the Tatarstan Republic

Королев

Ескин

Barieva

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The structure of geological sections of the Visean stage of small oil fields in the Western Zakamya region of the Tatarstan Republic is considered. It has been established that potentially oil-bearing deposits are carbonate-terrigenous deposits of the Tulian-Bobrikian horizon and carbonate deposits of the Aleksininian horizon. In the Tulian-Bobrikian sediments, oil deposits are localized in fine-grained quartz sandstones, the cap rocks are dense claystones. Due to the small thickness of the layers of oil-saturated sandstones, their development is not very promising. In the deposits of the Aleksininian horizon, oil deposits are localized in cavernous limestones overlain by dense diagenetic dolomites. The thickness of the oil reservoirs is 2.0-2.5 m, which allows them to be considered as potential targets for development. The presence of sulfate mineralization in the pores of reservoir rocks suggests that the oil deposits of the Aleksininian horizon are at the initial stages of waterflooding..

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Structure and Changes in Reservoir Properties of Bobrikovskian in Visean Incisions (on the Examples of Melekess Depression Deposits)

Cited by 3 publications

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Reservoir oil deposits in terrigenous complexes of the Bobrikian horizon of the western slope of the South Tatar arch

Reservoir oil deposits in terrigenous complexes of the Bobrikian horizon of the western slope of the South Tatar arch

Evaluating the thickness of thin-bed seams using seismic data on the example of the Tula-Bobrikovian sediments in the Republic of Tatarstan

Assessment of the prospects for oil-bearing deposits of the Visean stage of the Western Zakamya region at the Tatarstan Republic

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