Tag: oil

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PROSPECTS FOR OIL AND GAS PRESENCE IN CARBONATE DEPOSITS OF SILURIAN AGE IN THE BEREZHANY-BUCHACH ZONE OF TECTONIC DISLOCATIONS OF VOLYN-PODILLIA AREA

Home > Archive > No. 1–2 (193–194) 2024 > 50–68

Geology & Geochemistry of Combustible Minerals No. 1–2 (193–194) 2024, 50–68

https://doi.org/10.15407/ggcm2024.193-194.050

Svitlana HARASYM, Yaroslav LAZARUK

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: igggk@mail.lviv.ua

Abstract

The Berezhany-Buchach zone of local uplifts belongs to the Podillia promising district, located in the southern part of the Volyn-Podillia oil and gas region. Most of the local structures of the district are genetically related to tectonic disturbances. The structuring factor of the Berezhany-Buchach zone of tectonic dislocations is a fault of subregional extension, probably of a reverse-thrust character. Organogenic structures of the Silurian age are spatially connected with it. According to the results of lithologic-facies studies, they were deposited in lagoon-shelf conditions in a narrow strip 15–40 km wide, which stretches from the border with Romania in the southeast to the border with Poland in the northwest. According to the predominance of the remains of organisms, coral, stromatopore, crinoid, ostracod, brachiopod and algal species are distinguished among carbonates. They are recrystallized as a result of epigenetic processes. The reservoir rocks are composed of silty-detrital limestones, dolomitized limestones, and dolomites. There are both porous and cavernous, as well as fissure-pore and fissure-cavern collectors. Primary porosity is caused by voids inside and between organisms, and secondary capacity is caused by recrystallization, dolomitization, leaching, cavernous and fissure formation. The open porosity of carbonates varies on average from 4 to 16 %, permeability – from 0.01 to 2 mD. In the southeastern direction, the collector properties of carbonates deteriorate. Industrial deposits of hydrocarbons in the Silurian carbonates of Volyn-Podillia have not been established, however, numerous oil and gas occurrences were recorded during drilling. Based on the materials of lithologic and facies studies, the results of studying the reservoir properties of reservoir rocks, seismological and magnetometric constructions, and data from surface geochemical studies, the probable Berezhany, Dobrovoda, and Buchach objects were identified, their resource base was estimated at 48.6 million tons of oil and 1.3 billion m3 of dissolved gas, and the tasks for 3D seismic exploration were substantiated for the purpose of preparing the mentioned objects for exploratory drilling for oil and gas.

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Keywords

oil, deposit, oil traps, carbonate reservoir, hydrocarbon reserves

Referenses

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OPTIMIZATION DIRECTIONS OF EXPLORATION AND DEVELOPMENT OF OIL FIELDS OF THE WESTERN FORE-BLACK SEA AREA OF UKRAINE

Home > Archive > No. 3–4 (191–192) 2023 > 7–19

Geology & Geochemistry of Combustible Minerals No. 3–4 (191–192) 2023, 7–19

https://doi.org/10.15407/ggcm2023.191-192.007

Yaroslav LAZARUK, Myroslav PAVLYUK

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: igggk@mail.lviv.ua

Abstract

The southern part of the Dobrogea Foredeep is located in the southwestern regions of Ukraine within the Odesa region. Here, on the territory of the uplifted Bilolissya block, the East Sarata, Zhovtyjar, Saryjar, Zarichna oil accumulations are located in the chemogenic-carbonate layer of the Middle and Upper Devonian. The deposits are confined to limestones and dolomites with secondary fractured-cavernous-porous reservoirs. They lie at depths of 2500–3200 m. During the test of two dozen wells, the filtrate of the drilling fluid with a small amount of oil was received with the estimated flow rates of several tons per day. The rise of the oil level in the wells was quickly stopped, the hydrodynamic connection of the wells with the productive formations was lost. The use of today’s known methods of intensification of the flow of hydrocarbon fluids did not lead to positive results. According to the research of microphotographs of reservoir rocks, it is proved that the largest voids of reservoir rocks are filled with immobile bitumen, while the smaller cavities contain mobile oil. Immobile bitumen fills main channels and blocks communication between rock cavities. This is the main reason for the absence of industrial inflows of oil to the wells. Another important reason is the low filtering properties of the collectors. Most of them have a permeability of less than 0.01∙μD. Other reasons for the failure of the industrial development of oil deposits are the high dynamic viscosity of oil due to the high content of asphaltenes, silicagel resins, paraffins, the low energy potential of oil deposits due to their degassing during the long geological time, as well as the lack of hydrodynamic connection of oil deposits with natural water pressure systems. We assume that the Middle and Upper Devonian oil fields of the Western Fore-Black Sea area are most likely mainly bituminous. Given the significant depths of the deposits, their industrial development is technically impossible today. Therefore, it is impractical to plan further scientific research on the mentioned complex. Instead, research should be reoriented to the Silurian terrigenous-carbonate complex and the Lower Devonian terrigenous complex, which are hydrodynamically more closed and in which non-degassed hydrocarbon accumulations can be preserved.

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Keywords

oil, bitumen, deposit, oil traps, carbonate reservoir, terrigenous complex, hydrocarbon reserves, exploration and development of deposits

Referenses

Hnidets, V. P., Hryhorchuk, K. H., Polukhtovych, B. M., & Fedyshyn, V. O. (2003). Litohenez devonskykh vidkladiv Prydobrudzkoho prohynu (paleookeanohrafiia, sedymentatsiina tsyklichnist, formuvannia porid-kolektoriv). Kyiv: UkrDHRI. [in Ukrainian]

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Lazaruk, Ya. H., Melnyk, A. Yu., Vasylyna, R. M., & Sheremet, B. B. (2017b). Heoloho-ekonomichna otsinka Zhovtoiarskoho naftovoho rodovyshcha Odeskoi oblasti [Research report]. Kyiv: PrAT NVK “Ukrnaftinvest”. [in Ukrainian]

Pavliuk, M. I. (2014). Heodynamichna evoliutsiia ta naftohazonosnist Azovo-Chornomorskoho i Barentsovomorskoho perykontynentalnykh shelfiv. Lviv: Proman. [in Ukrainian]

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Trokhymenko, H. L. (2013). Osoblyvosti pryrodnykh rezervuariv vuhlevodniv u potuzhnykh karbonatnykh kompleksakh. Geologiya i poleznyye iskopayemyye Mirovogo okeana, 4, 46–62. [in Ukrainian]

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THE FORMATION AND CRITERIA OF OIL- AND GAS-BEARING POTENTIAL OF HYDROCARBON ACCUMULATIONS OF THE WESTERN OIL-GAS REGION OF UKRAINE

Home > Archive > No. 1–2 (183–184) 2021 > 14–44

Geology & Geochemistry of Combustible Minerals No. 1–2 (183–184) 2021, 14–44.

https://doi.org/10.15407/ggcm2021.01-02.014

Myroslav PAVLYUK, Yaroslav LAZARUK, Volodymyr SHLAPINSKY, Olesya SAVCHAK, Ivanna KOLODIY, Myroslav TERNAVSKY, Halyna HRYVNIAK, Lyubov HUZARSKA, Natalia KOVALCHUK

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, e-mail: igggk@mail.lviv.ua

Abstract

In the paper we have analysed hydrocarbon deposits of the Western region according to their belonging to the tectonic zones, stratigraphic complexes, types and depths of occurrence. The law-governed nature of alteration in physical-chemical properties of oil and gas, hydrogeological and geochemical peculiarities of productive thickness were studied, haloes of the distribution of gas of hydrocarbon and non-hydrocarbon composition outcrops of fluids were mapped. Problems of the formation of hydrocarbon accumulations were considered. According to the results of integrated analysis of different geological factors, besides the main factors of oil and gas presence – structure, reservoir, cover – additional criteria were proposed. In the direction to the deposit, the nitric-methane gases are changed into sufficiently methane and hydrocarbon-methane ones, and values of saturation pressure are comparable to the formation pressure. Indication of oil-gas presence are water-soluble organic matters of oil origin: bitumen, phenols, hydrocarbons, naphthenic acids as well as the presence of condensation waters or their mixture with formational waters. Probable indicators of hydrocarbon accumulations are sulfides of zinc, lead, copper in rocks. For the existence of the deposits the hydrogeological closing of the bowels is necessary: small velocities of the formational waters, their high mineralization, metamorphism intensity, chlorine-calcium type of waters. Natural oil-gas showings as a reflection of deposits that occur at a depth serve as criterion for estimation of prospects of the oil-gas presence in the open territories. The example of substation of prospecting objects is given according to criteria of the oil-gas presence in the platform autochthone under the overthrust of Pokuttia-Bukovyna Carpathians.

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Keywords

oil, gas, criteria of oil-gas presence, formation of fields, indications of oil-gas presence

Referenses

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Kolodii, V. V. (1975). Podzemnye kondensatsionnye i solyutsionnye vody neftyanykh, gazokondensatnykh i gazovykh mestorozhdenii. Kiev: Naukova dumka. [in Russian]

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VERTICAL THERMOBARIC ZONING OF HYDROCARBON DEPOSITS OF THE EASTERN OIL- AND GAS-BEARING REGION OF UKRAINE

Home > Archive > No. 3 (180) 2019 > 60-75

Geology & Geochemistry of Combustible Minerals No. 3 (180) 2019, 60-75.

https://doi.org/10.15407/ggcm2019.03.060

Oleksandr PRYKHODKO, Ihor HRYTSYK, Ihor KUROVETS, Svitlana MELNYCHUK

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv,
e-mail: igggk@mail.lviv.ua

Abstract

For the predictive appraisal of the perspective exploratory territories as well as prediction of separate producing horizons of prospecting and exploration areas for oil and gas it is necessary to establish the regularities of distribution of already explored deposits of hydrocarbons with structural-tectonic construction, lithological-stratigraphic features, hydrogeological and geothermobaric conditions of oil- and gas-bearing region taken into account.
Interconnection between geothermobaric parameters and the phase state of hydrocarbons in the vertical section should be an important factor for the solution of the posed task.
Within the limits of the Eastern oil- and gas-bearing area of Ukraine, the spatial zoning is established in the location of gas, oil and gas-condensate deposits. As a whole, the distribution of temperatures and pressures at different depths, average geothermal gradients, gradients of the lithological-stratigraphical horizons of the same name (sustained both as to the area and thickness) are closely connected with the deep geological structure of the studied region (area) and confirm the existing notions of the role of tectonic, lithological-stratigraphic and hydrogeological factors in the formation of the thermal regime of sedimentary basins.
Vertical zoning of the distribution of hydrocarbon deposits of oil- and gas-bearing horizons was developed according to geothermobaric parameters of the north-western part of the Dnieper-Donets Depression and 8 areas from 15 ones of the Eastern oil- and gas-bearing region, namely: Monastyryshche-Sofiivka and Talalaivka-Rybalske oil- and gas-bearing areas, Glynsk-Solokha gas- and oil-bearing area, Ryabukhyne-Northern Golubivka and Mashivka-Shebelynka gas-bearing areas, Rudenky-Proletarske oil- and gas-bearing region, Krasna Rika gas-bearing area and also oil- and gas-bearing area of the Northern edge.
Revealed regularities of the distribution of formation temperatures, pressures, geothermal and thermobaric coefficients with peculiarities of the tectonic structure of the Dnieper-Donets graben taken into account will make it possible to solve theoretical problems connected with hydrocarbon migration, the formation and preservation of deposits in more well-founded way that will make it possible to conduct prospecting for new fields at great depths within the studied territory more effectively,

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Keywords

thermobaric parameters, initial formation temperatures, initial formation pressures, thermobaric coefficient, hydrostatic pressure, hydrostatics coefficient, producing horizon, oil- and gas-bearing complex, phase state of hydrocarbons, exploratory-prospecting works, oil, gas and gas-condensate deposits.

REFERENCES

Atlas rodovyshch nafty i hazu Ukrainy. T. 1-3. Skhidnyi naftohazonosnyi rehion [Atlas of oil and gas fields of Ukraine. Vol. 1-3. Eastern oil- and gas-bearing region]. (1998). Lviv: Tsentr Yevropy. [in Ukrainian]
 
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