Gas Hydrates in the Black Sea Basin

Korsakov, O. D.; Byakov, Yu. A.; Stupak, S. N.

doi:10.1080/00206818909465977

Cited by 15 publications

(11 citation statements)

References 4 publications

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“…The Black Sea aquifer is characterized by the presence of gas hydrate deposits, which thickness, according to geologists and seismic survey results, reaches an average of 700 m. The Ukrainian part of the sea has methane gas resources, which can be extracted from gas hydrate deposits located directly opposite the Crimean Peninsula, about 20 -25 trillion m 3 . The total forecasted gas resources throughout the Black Sea amount at least to 100 trillion m³, based on the results of drilling and analysis of the studied cores (1988 -1989) (Korsakov, Byakov, & Stupak, 1989; Gas Hydrates in the Black Sea Basin, 1990).…”

Section: Mining-geological Features Of Gas Hydrate Deposits Occurrence In the Black Seamentioning

confidence: 99%

Thermodynamic and geomechanical processes research in the development of gas hydrate deposits in the conditions of the Black Sea

Bondarenko¹,

Sai²,

Prokopenko³

et al. 2018

Min. miner. depos.

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Purpose. Research of thermodynamic and geomechanical processes occurring in a gas hydrate body under the influence of an activating agent (sea water from surface layers) in the conditions of the Black Sea by mathematical modeling using finite element method.Methods. The modeling of thermodynamic and geomechanical processes is performed with the use of ANSYS v17.0 software and in accordance with the climatic, hydrogeological and physic-mechanical properties of the numerical model elements in the Black Sea gas hydrate deposit under consideration, which are similar to natural ones. The thermodynamic processes were studied in the section "Steady-State Thermal", and the geomechanical (stress-strain state) in "Static Structural".Findings. The spatial model is developed, which allows to simulate thermodynamic and geomechanical processes in a gas hydrate body under the influence of a thermal agent. As a result of modeling, it was determined that under these conditions the temperature in the gas hydrate body varies with the distance from the production well similarly in both directions according to the polynomial dependence. What is more, at a distance from the well of 18.7 m the temperature is stable and equals +22°С, and in the range of 18.7 -24.9 m -decreases by 3.1 times and reaches a value of +7°С. It was found out that deformations in a gas hydrate body under the influence of an activating agent, which is fed under pressure above the initial, are directed from the lateral boundaries to the center of the gas hydrate body in the direction of productive dissociation zones. This, in its turn, results in the displacement of the gas hydrate volume to the reaction proceeding center, improving the quality of the decomposition process and allows mining of 87 -91% gas hydrate volume, which is presented in the model. Originality. For the first time, for the conditions of the Black Sea gas hydrate deposits, an analytical assessment of the dissociation zone distribution from the production well under the influence of the thermal agent and the changes of the stress-strain state of the gas hydrated body during its decomposition, has been carried out. This allows to improve the technology of the gas hydrate deposits development in the conditions under consideration.Practical implications. The technological scheme for the development of a gas hydrate body based on the combined approach to the effects of activators (temperature and pressure) is proposed, which eliminates the need to warm the boundary sections of the deposit and increases the amount of the supplied activating agent and its temperatures, which in its turn leads to a decrease in the resource-and energy consumption.

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Section: Mining-geological Features Of Gas Hydrate Deposits Occurrence In the Black Seamentioning

confidence: 99%

Thermodynamic and geomechanical processes research in the development of gas hydrate deposits in the conditions of the Black Sea

Bondarenko¹,

Sai²,

Prokopenko³

et al. 2018

Min. miner. depos.

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“…Gas hydrate studies in the Black Sea date back to the late 1980s (Nomokonov and Stupak, 1988;Korsakov et al, 1989). During Training Through Research expeditions in the 1990s, gas hydrates were sampled over some mud volcanoes in the deep waters of the central Black Sea and in the Sorokhin Trough (Ivanov and Woodside, 1996;Woodside et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…The study area lies approximately 25 km west of the Akçakoca field where Turkish Petroleum has been producing dry gas with a biogenic to mixed origin (Menlikli et al, 2009). Gas hydrate studies in the Black Sea date back to the late 1980s (Nomokonov and Stupak, 1988;Korsakov et al, 1989). During Training Through Research expeditions in the 1990s, gas hydrates were sampled over some mud volcanoes in the deep waters of the central Black Sea and in the Sorokhin Trough (Ivanov and Woodside, 1996;Woodside et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Seismic identification of gas hydrates: A case study from Sakarya Canyon, western Black Sea

Nasıf

Özel

Dondurur

2020

Turkish J Earth Sci

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Multichannel seismic, 3.5-kHz Chirp subbottom profiler and multibeam bathymetric data were collected along the western Black Sea margin, offshore Sakarya River, to investigate the bottom-simulating reflections (BSRs), free gas accumulations, and mud volcanoes. Geometries from the seismic data indicate widespread BSRs along the continental rise between 750 and 1950 m water depths, 70 to 350 ms below the seafloor. Seismic attribute analyses have been applied to the seismic data to reveal the acoustic properties of the gas hydrates. According to the results from such analyses, we conclude that there are acoustically transparent zones beneath most of the BSRs in the area, which are interpreted as free gas accumulations, and the gas hydrate-bearing sediments are acting as seals for the free gas in the underlying sediments. Stability analysis of the gas hydrates from different BSR zones in the area suggests that the gas composition in the gas hydrates may change locally. As we do not have ground truth data from BSR zones, the exact composition of the gas forming the gas hydrates is unknown. However, hydrocarbon productivity of the area, chromatography results of the shallow sediment samples nearby, and stability analysis of the gas hydrates indicate the possible existence of a thermogenic gas component in the gas hydrate composition, resulting in a mixture of gas hydrates.

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“…The Black Sea offshore area is characterized by the occurrence of gas hydrate deposits, the thickness of which, according to geologists and seismic survey results, reaches at an average of 1000 m from the sea bed surface. The Ukrainian part of the sea has methane gas resources, which can be extracted from the gas hydrate deposits located directly opposite the Crimean Peninsula, about 20 -25 trillion m. The total projected gas resources throughout the Black Sea are at least 100 trillion m 3 , based on the results of drilling and the studied cores analysis (1988 -1989) (Korsakov, Byakov, & Stupak, 1989;Gas hydrates…, 1990).…”

mentioning

confidence: 99%

“…According to the regional seismic profiles by a grid of 25×25 km, made by the SEVRMORGEO association, a significant distribution of gas hydrates deposits within the deepwater Black Sea part has been set, and a map of prospects for gas content in the hydrate formation zone has been constructed (Fig. 3) (Korsakov, Byakov, & Stupak, 1989;Bondarenko, Ganushevych, Sai, & Tyshchenko, 2011).…”

mentioning

confidence: 99%

Peculiarities of geological and thermobaric conditions for the gas hydrate deposits occurence in the Black Sea and the prospects for their development

Bondarenko¹,

Sai²,

Petlovanyi³

2019

Journ. Geol., Geogr., and Geoec..

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The actuality has been revealed of the necessity to attract the gas hydrate depos- its of the Black Sea into industrial development as an alternative to traditional gas fields. This should be preceded by the identification and synthesis of geological and thermobaric peculiarities of their existence. It was noted that the gas hydrates formation occurs under certain thermobaric conditions, with the availability of a gas hydrate-forming agent, which is capable of hydrate formation, as well as a sufficient amount of water necessary to start the crystallization process. The gas hydrate accumulation typically does not occur in free space – in sea water, but in the massif of the sea bed rocks. The important role in the process of natural gas hydrates formation is assigned to thermobaric parameters, as well as to the properties and features of the geological environment, in which, actually, the process of hydrate formation and further hydrate accumulation occurs. It was noted that the source of formation and accumulation of the Black Sea gas hydrates is mainly catagenetic (deep) gas, but diagenetic gas also takes part in the process of gas hydrate deposits formation. The main component of natural gas hydrate deposits is methane and its homologs – ethane, propane, isobutane. The analysis has been made of geological and geophysical data and literature materials devoted to the study of the offshore area and the bottom of the Black Sea, as well as to the identification of gas hydrate deposits. It was established that in the offshore area the gas hydrate deposits with a heterogeneous structure dominate, that is, which comprises a certain proportion of aluminosilicate inclusions. It was noted that theBlack Sea bottom sediments, beginning with the depths of 500 – 600 m, are gassy with methane, and a large sea part is favourable for hydrate formation at temperatures of +8...+9oC and pressures from 7 to 20 MPa at different depths. The characteristics of gas hydrate deposits are provided, as well as requirements and aspects with regard to their industrialization and development. It is recommended to use the method of thermal influence on gas hydrate deposits, since, from an ecological point of view, it is the safest method which does not require additional water resources for its implementation, because water intake is carried out directly from the upper sea layers. A new classification of gas hydrate deposits with a heterogeneous structure has been developed, which is based on the content of rocks inclusions in gas hydrate, the classification feature of which is the amount of heat spent on the dissociation process.

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Gas Hydrates in the Black Sea Basin

Cited by 15 publications

References 4 publications

Thermodynamic and geomechanical processes research in the development of gas hydrate deposits in the conditions of the Black Sea

Thermodynamic and geomechanical processes research in the development of gas hydrate deposits in the conditions of the Black Sea

Seismic identification of gas hydrates: A case study from Sakarya Canyon, western Black Sea

Peculiarities of geological and thermobaric conditions for the gas hydrate deposits occurence in the Black Sea and the prospects for their development

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