ЛІТОЛОГО-ФАЦІАЛЬНІ ОСОБЛИВОСТІ ТА УМОВИ НАГРОМАДЖЕННЯ БАЗАЛЬНИХ ВІДКЛАДІВ СЕРЕДНЬОГО ДЕВОНУ ПЕРЕДДОБРУДЗЬКОГО ПРОГИНУ

В. Гнідець; К. Григорчук; Л. Кошіль; М. Яковенко

doi:10.17721/17282713.81.01

Authors

V. Gnidets Department of sedimentology of provinces of combustible minerals Institute of Geology and Geochemistry of Combustible Minerals of National Academy of sciences of Ukraine tel.: +38 (032) 2634161 3a, Naukova Str., Lviv, 79060, Ukraine
K. Grygorchuk Department of sedimentology of provinces of combustible minerals Institute of Geology and Geochemistry of Combustible Minerals of National Academy of sciences of Ukraine tel.: +38 (032) 2634161 3a, Naukova Str., Lviv, 79060, Ukraine
L. Koshil Department of sedimentology of provinces of combustible minerals Institute of Geology and Geochemistry of Combustible Minerals of National Academy of sciences of Ukraine tel.: +38 (032) 2634161 3a, Naukova Str., Lviv, 79060, Ukraine
M. Yakovenko Department of sedimentology of provinces of combustible minerals Institute of Geology and Geochemistry of Combustible Minerals of National Academy of sciences of Ukraine tel.: +38 (032) 2634161 3a, Naukova Str., Lviv, 79060, Ukraine

DOI:

https://doi.org/10.17721/17282713.81.01

Keywords:

Dobrudja Foredeep, Middle Devonian, lithofacies, sulphate carbonate shelf, hydrocarbon traps

Abstract

The main purpose of this work is to identify lithofacies features and sedimentation conditions of basal thickness of Eifelian deposits within Biloliskyi block of Dobrudja Foredeep. Methods include lithological interpretation of geological and geophysical materials, lithofacies and sedimentological analyses. Features of lithofacies zonality of Early Eifelian deposits have been determined. It has been shown that argillaceous sulphate sediments are mostly within Sariyarsko-Zhovtoyarska and Saratsko-Balabanivska anticlinal zones and carbonate sediments are in depressions. The reconstructions of environments of their sedimentation have been done, which showed irregular character of spatial age-specific development of formations of different facial zones of sulphate carbonate shelf. The supra-littoral territory was occupied by Sariyarsko-Zhovtoyarska and Saratsko-Balabanivska uplifts and bordered with rather narrow zones of littoral and upper sublittoral. The main part of Tuzlivska and Alibeiska depressions occupied lower sublittoral. Wedge-out of horizons of upper sublittoral with biostrome in the arch uplifts has been displayed. Scientific novelty. For the first time lithofacies zonality of Early Eifelian deposits and their environments have been done. Practical significance. Displayed wedge-out of horizons with biostrome in the arch uplifts may indicate non-anticlinal nature of hydrocarbon traps in Middle Devonian deposits, thus some corrections should be done in practice of oil and gas searching of this region.

References

Gnidets, V.P., Grygorchuk, K.G., Poluhtovych, B.M. et al. (2003). Lithogenesis Devonian deposits of Dobrogean foredeep (paleoceanography, sedimentary cyclicity, reservoir rocks' formation). Kyiv: Publishers UkrSGRI, 96. [in Ukrainian].

Gnidets, V.P., Grygorchuk, K.G., Koshil, L.B. et al. (2016). The lithofacies zonality and lithmological structure of Eifelian deposits of Dobrudja Foredeep. Geodynamics, 1 (20), 50-62. [in Ukrainian].

Machulina, S.A., Shehunova, S.B. (2008). The basal measures of terrigenous, carbonate and saliferous formations and their role in the building of sedimentary basins according to forecasting of mineral resourcers. Collection of scientific works of the Institute of Geological Sciences NAS of Ukraine, 1, 255-261. [in Russian].

Gozhyk, P.F., Chebanenko, I.I., Evdoschuk M.I. et al. (2007). Oil and gas prospecting objects of Ukraine. Scientific and practical fundamentals of researching of the deposits in north-western shelf of the Black Sea. Kyiv: EKMO, 232. [in Ukrainian].

Reding, H.G., Reding, D.D., Kollinson, X.G., Allen, F.A. et al. (1990). Sedimentation environments and facies. В. 1. М.: Mir, 352. [in Russian].

Mahnach, A.S., Moskvich, V.A.,Kruchek, S.A. et al. (1984). Organogenic buildings of Devonian of Belorussia. Minsk: Nauka I tehnika, 236. [in Russian].

Skachedub, Ye.O. (1998). Conditions of sedimentation and oil and gas bearing of Middle Devonian and Lower Carboniferous evaporite formation of Dobrudja Foredeep. Geology and geochemistry of combustible minerals, 1 (102), 41-52. [in Ukrainian].

Taninskaya, N.V. (2010). Sedimentology criteria of reservoir forecast in Middle Ordovician – Lower Devonian deposits of Timano-Pechersk province. Oil and gas geology. Theory and Practice, 5, 4,1-29. [in Russian].