Seda Okay, GAS SIPS AND SHALLOW ACCUMULATIONS OF GAS ON THE SHELF OF TURKEY IN THE BLACK SEA

https://doi.org/10.15407/gpimo2021.01.026

Seda Okay, Assistant Professor

Dokuz Eylul University, Institute of Marine Sciences and Technology

Haydar Aliyev Bulvar1, 100, Inciralt1, Izmir, Turkey

E-mail: seda.okay@deu.edu.tr  ORCID  0000-0002-6976-7854

Günay Çifçi, Professor (Full)

Dokuz Eylül University, Institute of Marine Sciences and Technology,

Tinaztepe Campus, 35160 Buca, Izmir, Turkey

E-mail: gunay.cifci@deu.edu.tr  ORCID  0000-0002-4380-8056

GAS SIPS AND SHALLOW ACCUMULATIONS OF GAS ON THE SHELF OF TURKEY IN THE BLACK SEA

It has been suggested that shelf and slope sediments of high deposition rate are methane sources, whereas the deep basin is methane sink. The methane production and migration in sediments may cause massive slope failures so methane is geologically important. Methane production is also economically important as methane seeps may indicate the presence at depth of hydrocarbon reservoirs, and methane hydrate may be an important source of energy.

Recent studies in marine geology indicate potential geo-resources in the Turkish coast of Black Sea. The Black Sea sediments are rich in calcite and organic carbon, the latter showing a high degree of preservation due to anoxia in the waters below 100-150 m. Different marine geophysical surveys at different times were carried out in order to understand the sedimentary features of gas-saturated sediments in the Black Sea. Multibeam, side scan sonar, sub-bottom profiler and multi-channel seismic data were collected to make both high-resolution bathymetric and reflectivity maps of the seafloor. In some cruises, deep-tow combined side scan sonar and subbottom profiler was used to obtain acoustic images of both the seafloor surface and subbottom sediments. Several different structures were observed in the Black Sea basin as slumps, pockmarks, faults, gas chimneys, shallow gas accumulations and dome-like structures. Structures, which contain gas hydrates, are present on the seismic sections as strong acoustic reflections.

Кeywords: Black sea, gas sips, gas accumulations, Turkish shelf, seismic sections

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