New Evidences Of Compressional Tectonic Regime At The Southern Part Of The Western Black Sea Basin Along Turkish Margin (Between Akcakoca And Cide)

Onal, Kemal Mert; Demirbağ, Emin

doi:10.3997/2214-4609.201702582

Cited by 3 publications

(4 citation statements)

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“…(Korucu et al, 2013). b) Lithostratigraphic summary of the Akcakoca-1 well adapted from (Önal and Demirbag, 2019). c) Geologic map of the coastal area near Sakarya and Akcakoca.…”

Section: Discussionmentioning

confidence: 99%

Does the syn- versus post-rift thickness ratio have an impact on the inversion-related structural style?

Tămaș

Tari³

et al. 2023

Preprint

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Abstract. Many extensional basins worldwide are modified by subsequent compressional episodes, which lead to inverted structures. The structures associated with the reactivation of preexisting faults play are critically important in forming suitable subsurface traps for hydrocarbons. Major concerns regarding inverted structures are trap integrity and fault seal. In general, the preferred structures have simple four-way closures as the result of only mild to moderate inversion. Five physical sandbox models, coupled with Particle Image Velocimetry (PIV) analysis, have been performed to address the influence of the syn- versus post-rift thickness ratio (Mode I and II) and the degree of positive inversion on the style of fault propagation into and overall deformation of the post-rift cover. The results of these experiments are broadly comparable with natural data examples from New Zealand, Israel and Turkey. The main control on the development of mild to moderate inversion structures is the degree of inversion, and the style of deformation within the post-rift sequence appears to be different due to the amount of displacement accommodated by the inherited listric fault and the thickness of the post-rift cover (Mode I and II inverted structures). These observations do have a direct impact on the understanding of the geo-energy systems associated with inverted structures.

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“…(Korucu et al, 2013). b) Lithostratigraphic summary of the Akcakoca-1 well adapted from (Önal and Demirbag, 2019). c) Geologic map of the coastal area near Sakarya and Akcakoca.…”

Section: Discussionmentioning

confidence: 99%

Does the syn- versus post-rift thickness ratio have an impact on the inversion-related structural style?

Tămaș

Tari³

et al. 2023

Preprint

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“…The drilling interval was between 144 m and 203 mbsf. Although mostly silty clays are common in the Black Sea, many coarse sands were recovered in the core samples collected in the Black Sea. ,− The estimated gas hydrate saturations in the core samples of the Black Sea range from 9.1 to 50%. ,− The geochemical analysis of these samples also showed that the Black Sea has both biogenic and thermogenic gas potentials. In the literature, there have been several CH 4 hydrate reserve estimations in the Black Sea in Figure .…”

Section: Gas Hydrate Potential Of the Black Seamentioning

confidence: 99%

Gas Production from Methane Hydrate Reservoirs in Different Well Configurations: A Case Study in the Conditions of the Black Sea

Ubeyd

Merey

2020

Energy Fuels

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Gas hydrates are considered “near-future energy resources” due to their vast existence all around the world. Recently, China has tested gas production from methane hydrate-bearing clayey silts via horizontal well technology for the first time. This study aims to investigate the effect of well configuration on gas production from the Black Sea gas hydrates. Mainly, two different hydrate-bearing models (single-layer homogeneous hydrate-bearing sands and multilayer hydrate-bearing turbidite) were constructed in this study. Gas production numerical simulations were held using the TOUGH + HYDRATE simulator. Gas production via the horizontal well in single-layer homogeneous hydrate-bearing sand was higher compared to the vertical well case at early stages. However, fast depressurization via the horizontal well caused a rapid decline in reservoir temperature and hydrate dissociation rate. Then, local hydrate reformation was detected near the wellbore. In the later periods of gas production, higher gas production with the vertical well was obtained. The clay layers in the heterogeneous methane hydrate reservoirs (alternating sand and clay layers in turbidite) behave like a barrier to depressurization with a horizontal well.

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“…Map modified from the GeoMapApp. Black Sea focal mechanism is based on Önal and Demirbağ (2019). (b) Shaded relief map illustrating the tectonics of the central Pontides.…”

Section: Regional Settingmentioning

confidence: 99%

“…The location of an imbricate structure interpreted as reverse faults, aligned with the hypocenter of the Bartın 1968 earthquake (Damcı et al, 2004). Farther offshore to the WNW, a magnitude 5.0 earthquake with a thrust focal mechanism (Önal & Demirbağ, 2019) occurred in 2016 as a result of ongoing regional deformation (Figure 1a).…”

Section: Regional Settingmentioning

confidence: 99%

Quaternary Rock Uplift Rates and Their Implications for the Western Flank of the North Anatolian Fault Restraining Bend; Inferences From Fluvial Terrace Ages

et al. 2020

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In the western flank of the North Anatolian Fault restraining bend (i.e., Central Pontides), the Filyos River incises through the uplifting Karabük Range, creating the~1.7-km-deep Filyos River Gorge on the hanging wall of the reverse Karabük Fault. Seven fluvial strath terrace levels are preserved in this gorge. optically stimulated luminescence ages from quartz-rich sediments of five terrace levels reveal an average long-term rock uplift rate of 0.45 ± 0.02 mm yr −1 with an unsteady pattern of uplift during the last 542 ± 24 kyr. Uplift rates of 1.52 ± 0.6 and 0.74 ± 0.3 mm yr −1 occurred before 366 ± 19 kyr, followed by lower rates of~0.1 and 0.31 mm yr −1 through present. These later uplift rates may reflect relatively slower tectonic rates since~366 kyr, with closer similarity to regional uplift rates of~0.3 mm yr −1 yielded from the eastern flank of the Central Pontides. The Karabük Range fluvial terraces are near the North Anatolian Fault, meaning pre-~366 kyr uplift rates may be a glimpse of the highest Central Pontides Quaternary rock uplift rates on uplifting hanging wall blocks activated by the restraining bend. When we consider offshore seismic reflection data, the focal mechanism solution of the Bartın Earthquake, onshore structural data, and regional tectonic geomorphology, the western flank of the Central Anatolian Plateau's northern margin is propagating northward as a growing orogenic wedge with a positive flower-structure geometry. Plain Language Summary In north central Turkey, the northern bend of the North Anatolian fault causes uplift (i.e., Central Pontides), the Filyos River incises vertically into the uplifting topography, creating a 1.7-km-deep gorge west of the Karabük Fault. Seven river terrace levels were preserved, representing former elevations of the Filyos River. The optically stimulated luminescence technique was used to estimate the ages of these terraces, revealing a rate of vertical river incision into uplifting topography. This yielded a long-term rock uplift rate of~0.45 mm yr −1 (~45 cm kyr −1) since around 540 kyr. However, the pattern was unsteady, with uplift rate periods of~1.52 and~0.74 millimeters per year until 366 thousand years ago, then lower rates of~0.1 and 0.31 mm yr −1 through present. These later uplift rates may indicate weaker tectonics in the area compared to before, while they are also similar to regional rates measured farther east. The uplift rates before 366 kyr on the uplifting side of the Karabük Fault may be a glimpse of some of the higher uplift rates in the Central Black Sea region of Turkey.

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New Evidences Of Compressional Tectonic Regime At The Southern Part Of The Western Black Sea Basin Along Turkish Margin (Between Akcakoca And Cide)

Cited by 3 publications

References 0 publications

Does the syn- versus post-rift thickness ratio have an impact on the inversion-related structural style?

Does the syn- versus post-rift thickness ratio have an impact on the inversion-related structural style?

Gas Production from Methane Hydrate Reservoirs in Different Well Configurations: A Case Study in the Conditions of the Black Sea

Quaternary Rock Uplift Rates and Their Implications for the Western Flank of the North Anatolian Fault Restraining Bend; Inferences From Fluvial Terrace Ages

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