Regional Rift Structure of the Western Black Sea Basin: Map-View Kinematics

Tari, Gábor; Fallah, Mohammad; Kosi, Walter; Schléder, Zsolt; Turi, Valentin; Krézsek, Csaba

doi:10.5724/gcs.15.34.0372

Cited by 20 publications

(11 citation statements)

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“…A certain combination of these effects could either improve or degrade the pre-drill risk profile of a hydrocarbon exploration target (e.g. Macgregor, 1995;Turner and Williams, 2004;Cooper and Warren, 2010;Bevan and Moustafa, 2012;Tari et al, 2020). Failure to recognize the impact of inversion on a basin's geologic evolution can have a disastrous impact on an exploration program.…”

Section: Introductionmentioning

confidence: 99%

Hydrocarbon accumulation in basins with multiple phases of extension and inversion: examples from the Western Desert (Egypt) and the western Black Sea

Bosworth¹,

Tari²

2021

Solid Earth

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Abstract. Folds associated with inverted extensional faults are important exploration targets in many basins across our planet. A common cause for failure to trap hydrocarbons in inversion structures is crestal breaching or erosion of top seal. The likelihood of failure increases as the intensity of inversion grows. Inversion also decreases the amount of overburden, which can adversely affect maturation of source rocks within the underlying syn-extensional stratigraphic section. However, many rift basins are multi-phase in origin, and in some cases the various syn-rift and post-rift events are separated by multiple phases of shortening. When an inversion event is followed by a later phase of extension and subsidence, new top seals can be deposited and hydrocarbon maturation enhanced or reinitiated. These more complex rift histories can result in intra-basinal folds that have higher chances of success than single-phase inversion-related targets. In other basins, repeated inversion events can occur without significant intervening extension. This can also produce more complicated hydrocarbon maturation histories and trap geometries. Multiple phases of rifting and inversion affected numerous basins in North Africa and the Black Sea region and produced some structures that are now prolific hydrocarbon producing fields and others that failed. Understanding a basin's sequence of extensional and contractional events and the resulting complex interactions is essential to formulating successful exploration strategies in these settings.

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Section: Introductionmentioning

confidence: 99%

Hydrocarbon accumulation in basins with multiple phases of extension and inversion: examples from the Western Desert (Egypt) and the western Black Sea

Bosworth¹,

Tari²

2021

Solid Earth

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“…the Andrusov Ridge is interpreted as a marginal ridge associated with the opening of 79 the western basin along the West Crimean transform fault [Tari et al, 2015]. The 80 Archangelsky Ridge was formed by the opening of the Sinop Trough, which is linked 81 to the western basin and is interpreted to have opened in Cretaceous to Palaeocene 82 times [Espurt et al, 2014;Robinson et al, 1996], with ongoing extension into the 83…”

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confidence: 99%

Crustal structure of the Mid Black Sea High from wide-angle seismic data

Shillington

Minshull

Edwards

et al. 2017

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14The Mid Black Sea High comprises two en-echelon basement ridges, the 15 Archangelsky and Andrusov Ridges that separate the western and eastern Black Sea 16 basins. The sediment coverage above these ridges has extensive seismic reflection 17 coverage, but the crustal structure beneath is poorly known. We present results from 18 a densely sampled wide-angle seismic profile, coincident with a pre-existing seismic 19 reflection profile, which elucidates the crustal structure. We show that the basement 20 ridges are covered by c. 1-2 km of pre-rift sedimentary rocks. The Archangelsky 21Ridge has higher pre-rift sedimentary velocities and higher velocities at the top of 22 basement (~6 km/s). The Andrusov Ridge has lower pre-rift sedimentary velocities 23 and velocities less than 5 km/s at the top of the basement. Both ridges are underlain 24 by c. 20-km thick crust with velocities reaching c. 7.2 km/s at their base, interpreted 25 as thinned continental crust. These high velocities are consistent with the geology of 26 2 the Pontides, which is formed of accreted island arcs, oceanic plateaux and 27 accretionary complexes. The crustal thickness implies crustal thinning factors of ~1.5-28

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“…It has been widely believed that at the level of the syn-rift sequence the northern WBSB and northern EBSB are bounded from their margins, including the Andrusov Ridge and Shatskiy High, by normal faults, which were understood to have never been inverted after the rifting stage ceased, e.g. [Finetti et al, 1988;Nikishin et al, 1998Nikishin et al, , 2001Nikishin et al, , 2012Nikishin et al, , 2015aStarostenko et al, 2004;Shillington et al, 2009Shillington et al, , 2017Okay, Nikishin, 2015;Tari et al, 2015]. It means that the architecture of the two basins did not considerably change since the beginning of the post-rift stage.…”

Section: Sorokin Trough and Marine Continuation Of The Crimean Folds mentioning

confidence: 99%

“…Are the WBSB and EBSB originally (sub) oceanic basins that are separated by the Andrusov Ridge? Tectonic and geodynamic models of the Black Sea over the past decades usually consider both WBSB and EBSB as originally separate back-arc rift basins that even could reach the stage of forming the oceanic or suboceanic crust and further evolved as deep marine basins [Neprochnov et al, 1970;Letouzey et al, 1977;Zonenshain, Le Pichon, 1986;Görür, 1988;Finetti et al, 1988;Okay et al, 1994;Spadini et al, 1996Spadini et al, , 1997Ro binson, Kerusov, 1997;Nikishin et al, 1998Nikishin et al, , 2001Nikishin et al, , 2012Nikishin et al, , 2015aStarostenko et al, 2004;Scott et al, 2009;Shillington et al, 2009Shillington et al, , 2017Stephenson, Schellart, 2010;Munteanu et al, 2011Munteanu et al, , 2017Graham et al, 2013;Okay, Nikishin, 2015;Tari et al, 2015;Sosson et al, 2016;Monteleone et al, 2019]. Most of these models are usually based on the view that the present Andrusov Ridge and Shatskiy High are stable and extended uplifted blocks that originally formed during rifting stage(s) and have a moderately thinned continental crust (but thicker than the crust beneath the deep basins).…”

Section: Base Of Cretaceous Syn-riftmentioning

confidence: 99%

“…Paleowater depths. It has been previously suggested that the WBSB and EBSB evolved in the (sub)oceanic environment with the water depths more than 2 km throughout the whole syn-rift and post-rift subsidence history up to the recent time [Zonenshain, Le Pichon,1986;Görür, 1988;Belousov, Volvovskiy, 1989;Finetti et al, 1988;Okay et al, 1994;Robinson et al, 1996;Spadini et al, 1996Spadini et al, , 1997Nikishin et al, 2012Nikishin et al, , 2015aGraham et al, 2013;Okay, Nikishin, 2015;Tari et al, 2015;Sosson et al, 2016;Monteleone et al, 2019]. However, the Upper Cretaceous and Paleocene-Middle Eocene successions were deposited at depths that did not exceed 100 m in the areas of the Odesa Shelf and Crimea Peninsula [Gozhik et al, 2006;Barrier, Vrielynck, 2008].…”

Section: Base Of Cretaceous Syn-riftmentioning

confidence: 99%

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Geological structure and tectonic evolution of the Ukrainian sector of the Black Sea

Stovba

Popadyuk²,

Fenota

et al. 2020

Geofizicheskiy Zhurnal

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The entire Ukrainian sector of the Black Sea, which occupies its northernmost part, was studied with the interpretation of the post-1990 seismic reflection data along seismic lines having a total length of some 30 000 km. In the northern Black Sea relatively low extension of the continental crust occurred in Albian-Cenomanian times and did not cause formation of deep (sub)-oceanic basins. Rift faults formed three major rift basins. One of the ENE-WSW oriented rift basins occupied areas of the present-day Karkinit Through, Krylov-Zmiiny Uplift, Gubkin Ridge and Sulina Depression within the Odessa Shelf. Another ENE-WSW oriented basin included areas of the present-day Tetyaev High, Sorokin Trough, Crimea Mountains and Marine Continuation of the Crimean Folds. The NW-SE oriented major rift basin occupied areas of the present-day Andrusov Ridge, Eastern Black Sea Basin, Shatskiy High and Euxinian Graben. Passive, thermal (post-rift) subsidence lasted in Turonian-Middle Eocene times and occurred in marine basins with a water depth that did not exceed a few hundred meters. A strong regional compression at the end of the Middle Eocene interrupted the post-rift (thermal) subsidence of rift basins, strongly deformed the sedimentary cover and formed a large NW-SE oriented landmass. This onshore terrain occupied the central and southern parts of the Odessa Shelf and the Crimean Peninsula, and deep-water area, including the Euxinian Graben, Marine Continuation of the Crimean Folds, Sorokin Trough, Tetyaev High, Andrusov Ridge, Shatskiy High and Eastern Black Sea Basin. Up to 5 km of sediments were eroded during the time of the existence of the emerged onshore terrain. Two subsequent S-N compressional events occurred at the end of the Late Miocene and invoked folding and thrusting of the sedimentary sequences in the originally ENE-WSW Cretaceous rift basins mainly. Anticlinal structures on the Odessa Shelf underwent additional growth and numerous new anticline folds were generated on the margins of the Western Black Sea Basin, including the Sorokin Trough and Marine Continuation of Crimean Folds. During both Late Miocene compressional events broad landmasses arose across the northern Black Sea region. These onshore terrains ran in a roughly E-W direction and occupied the present-day shallow shelves and northern part of the current deep water as well as almost the whole Crimea Peninsula. Like the Late Eocene landmass, the Late Miocene onshore terrains were evidently a source of sediments into marine basins that surrounded them. The first Late Miocene compression probably coincided in time with the Messinian Salinity Crisis and it was apparently accompanied by a sharp fall of the sea level. Prior to the second Late Miocene compressional event the sea level had risen sufficiently that a considerable part of the Odessa Shelf and other parts of the middle Pontian landmass were covered, at least periodically, by a shallow sea. The present-day deep-water part of the study area began to subside rapidly in the Pliocene. The mechanical...

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Regional Rift Structure of the Western Black Sea Basin: Map-View Kinematics

Cited by 20 publications

References 0 publications

Hydrocarbon accumulation in basins with multiple phases of extension and inversion: examples from the Western Desert (Egypt) and the western Black Sea

Hydrocarbon accumulation in basins with multiple phases of extension and inversion: examples from the Western Desert (Egypt) and the western Black Sea

Crustal structure of the Mid Black Sea High from wide-angle seismic data

Geological structure and tectonic evolution of the Ukrainian sector of the Black Sea

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