Investigation of gas seepages in Thessaloniki mud volcano in the Mediterranean Sea

Date

2018-09-01

Author

MEREY, ŞÜKRÜ
Longinos, Sotirios Nik

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

26
views

0
downloads

Gas seepages are commonly observed in marine environment. Especially, gas seepages due to anthropogenic gas hydrate dissociation are big concerns recently. In the Eastern Mediterranean Sea, Thessaloniki mud volcano was detected. Gas hydrate stability conditions in this mud volcano is very fragile. For this reason, in this study, gas seepages were predicted by using HydrateResSim at different seafloor temperature increments varying from 1 to 5 degrees C and different sediment permeability values varying from 0.1 mD to 5mD in Thessaloniki mud volcano. Both the effect of temperature increment (above 1 degrees C increment) and the increase in permeability cause faster gas hydrate dissociation. The gas seepages on the seafloor of Thessaloniki mud volcano was investigated in this study by using the bubble rise theory. It was found that the effect of gas bubble diameter is high on the height of gas flare in the study area. The effect of permeability and lithology near seafloor on gas release after gas hydrate dissociation is huge. Generally, in Thessaloniki MV, clays are dominant so it is advantageous for environment because even if gas hydrate dissociates, free gas reaches to the seafloor slowly. Moreover, since the next 100 years, it is expected that temperature will increase by +2 degrees C on the seafloor of Thessaloniki MV. It was indicated that gas release will be obvious if temperature increment is above 1 degrees C in this area according to the numerical simulations with HydrateResSim.

Subject Keywords

Methane, Thessaloniki, Mud volcano, Mediterranean sea, Gas seepage, Gas hydrate

URI

https://hdl.handle.net/11511/64447

Journal

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

DOI

https://doi.org/10.1016/j.petrol.2018.05.014

Collections

Department of Petroleum and Natural Gas Engineering, Article

Suggestions

OpenMETU
Core

Numerical simulations for short-term depressurization production test of two gas hydrate sections in the Black Sea MEREY, ŞÜKRÜ; Sınayuç, Çağlar (2017-08-01) Gas hydrates are considered as a promising energy source and the Black Sea has a high potential of gas hydrates. The Danube Delta of the Black Sea is the most well-known prospect in the Black Sea after many geological and geophysical studies such as bottom-simulation reflectors (BSR) and electromagnetic surveys. In this study, gas production simulations from two gas hydrate layers (6 m thick hydrate layer at 60 mbsf and 30 m-thick hydrate layer at 140 mbsf above BSR at 350 mbsf) at the same locations with a...
Evaluation of limestone incorporated cement compositions for cementing gas hydrate zones in deepwater environments Hıdıroğlu, İnanç Alptuğ; Parlaktuna, Mahmut; Yaman, İsmail Özgür; Department of Petroleum and Natural Gas Engineering (2017) One of the potential problems which must be overcome during oil or gas exploration in deepwater environments is to complete the drilling operations without decomposing the gas hydrates. Gas hydrates remain stable as long as the thermodynamic conditions are not changed. But, especially by increasing temperature during drilling operations, there is always a possibility of change in thermodynamic conditions, which will cause decomposition. Another factor which may disturb the thermodynamic conditions is the ev...
Assessment of production strategies of a gas condensate field using a black oil simulator: a case study Parlaktuna, Burak; Sınayuç, Çağlar; Department of Petroleum and Natural Gas Engineering (2015) Condensates are low-density liquids that are produced along with the gas phase from wet gas or gas-condensate reservoirs. Availability of these liquids makes gas-condensate reservoirs more profitable than the other gas reservoirs since condensates are gasoline like fluids with API gravities more than 45°. Although the condensate production is profitable, the management of gas-condensate reservoirs is challenging. Due to their nature, condensates condense and separate from the gas if the pressure drops below...
The Gas Hydrate Potential of the Eastern Mediterranean Basin MEREY, Şükrü; LONGINOS, Sotirios Nik. (Bulletin of the Mineral Research and Exploration, 2018-12-25) Gas hydrate exploration studies have increased substantially since last decade. Gas hydrate reservoirs are commonly found in the marine environment and permafrost. Studies related to natural gas hydrates in the Mediterranean Basin are rare compared to those released on the continental margins of the United States of America, Japan, India, China and Korea. This study provides an evaluation of the gas hydrate potential of the Mediterranean Basin using available literature data such as scientific drilling...
The effect of gas production from deeper conventional gas reservoirs on shallower gas hydrate layer stability: A case study in the conditions of the Sakarya gas field, Western Black Sea Aydın, Hakkı; Merey, Şükrü (Elsevier BV, 2021-6) Gas hydrate deposits are generally found in the shallow deepwater regions where continuous permafrost exists. The presence of water, methane and thermodynamic conditions (low temperature and high pressure) is critical for gas hydrate accumulation. Disturbing thermodynamic conditions such as depressurizing and thermal treatment are the primary processes for gas hydrate dissociation. In this study, we investigate the stability of a shallow depth gas hydrate layer in the conditions of conventional gas producti...

Citation Formats

Ş. MEREY and S. N. Longinos, “Investigation of gas seepages in Thessaloniki mud volcano in the Mediterranean Sea,” JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING, pp. 81–97, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/64447.