Academic Journal
A thermobaric mechanism for the formation of low velocity zones in the crystalline crust of the northwestern Black Sea shelf: a new type of traps for abiogenic methane
| Τίτλος: | A thermobaric mechanism for the formation of low velocity zones in the crystalline crust of the northwestern Black Sea shelf: a new type of traps for abiogenic methane |
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| Συγγραφείς: | Korchin, V. A., Rusakov, O. M. |
| Πηγή: | Геофизический журнал, Vol 41, Iss 2 (2019) Geofizicheskiy Zhurnal; Том 41, № 2 (2019); 99-111 Геофизический журнал; Том 41, № 2 (2019); 99-111 Геофізичний журнал; Том 41, № 2 (2019); 99-111 |
| Στοιχεία εκδότη: | Institute of Geophysics of the National Academy of Sciences of Ukraine by S.I. Subbotin name, 2019. |
| Έτος έκδοσης: | 2019 |
| Θεματικοί όροι: | low velocity zones, petrophysical thermobaric model, Geography (General), QE1-996.5, 13. Climate action, regional abiogenic methane trap, Черное море, северо-западный шельф, верхняя кристаллическая кора, зоны малой сейсмической скорости, термобарическая модель разуплотнения кристаллических пород, региональная ловушка абиогенного метана, G1-922, NW Black Sea shelf, upper crystalline crust, Geology, Чорне море, північно-західний шельф, верхня кристалічна кора, зони малої сейсмічної швидкості, термобарична модель розущільнення кристалічних порід, регіональна пастка абіогенного метану |
| Περιγραφή: | Seismic studies of the NW Black Sea shelf have delineated low-velocity zones (LVZs) in the crystalline crust at depths of 6—16 km. For the first time, this paper presents a novel thermodynamic mechanism for their formation. The active temperature regime and deep geodynamic processes of the region provide evidence in favour of this mechanism. The LVZs are mainly associated with the thermal decompaction of rocks, which is not compensated by deep pressures. The rocks of such zones are characterized by an increase in fracturing and porosity and decrease in density, elastic parameters and thermal conductivity. As the rocks are permeable and hygroscopic they are able to more freely transform, absorb and localize mantle hydrocarbon-bearing fluids which, in turn, further destroy rock matter. Within the LVZs the existence of hydrocarbons is confirmed by the occurrence about 3200 activegas seeps and 8 gas and gas condensate fields. For the first time, the spatial coexistence was revealed between LVZs and a degassing tube to which hydrocarbon fields are related. LVZs zones should be considered as a new search criteria for thermobaric traps. Favourable conditions exist for the accumulation of abiogenic methane at a depth of 6—16 km that can substantially expand the hydrocarbon potential of the shelf in usage modern drilling technology. |
| Τύπος εγγράφου: | Article Other literature type |
| Περιγραφή αρχείου: | application/pdf |
| ISSN: | 2524-1052 0203-3100 |
| DOI: | 10.24028/gzh.0203-3100.v41i2.2019.164456 |
| Σύνδεσμος πρόσβασης: | https://doaj.org/article/10bab0ac3e3b49458fe777e05630debd http://journals.uran.ua/geofizicheskiy/article/view/164456/163943 http://journals.uran.ua/geofizicheskiy/article/view/164456 http://journals.uran.ua/geofizicheskiy/article/view/164456 |
| Rights: | CC BY NC SA |
| Αριθμός Καταχώρησης: | edsair.doi.dedup.....771e2bf7242e39430c17ba8381d6c99b |
| Βάση Δεδομένων: | OpenAIRE |
| ISSN: | 25241052 02033100 |
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| DOI: | 10.24028/gzh.0203-3100.v41i2.2019.164456 |