Department of Geology and Geoenviromment
Library of the School of Science

2021-09-23

2021

Varesis Alexandros

Αναστασάκης Γεώργιος, Καθηγητής, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, ΕΚΠΑ
Αντωναράκου, Ασημίνα, Καθηγήτρια, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, ΕΚΠΑ
Κοσκερίδου Ευτέρπη, Καθηγήτρια, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, ΕΚΠΑ
Λέκκας Ευθύμιος, Καθηγητής, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, ΕΚΠΑ
Μπέλλας Σπυρίδων, Κύριος Ερευνητής, Ινστιτούτο Πετρελαϊκής Έρευνας (ΙΠΕ) / Ίδρυμα Τεχνολογίας και Έρευνας (ΙΤΕ)
Καβύρης Γεώργιος, Αναπλ. Καθηγητής, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, ΕΚΠΑ
Ρουσσάκης Γρηγόριος, Διευθυντής Ερευνών, Τομέας Θαλάσσιας Γεωλογίας και Γεωφυσικής ΙΩ του ΕΛΚΕΘΕ

Seismic stratigraphy of the offshore Cenozoic basins of the NW Aegean Sea

English

Seismic stratigraphy of the offshore Cenozoic basins of the NW Aegean Sea

The present doctoral dissertation entitled "Seismic Stratigraphy of the offshore Cenozoic basins of NW Aegean" is related to the study of the seismic stratigraphy of the Cenozoic marine basins in the wider area of the northwestern Aegean. The two areas of interest, in which the study focused, are the North Aegean Trough, as well as the off – shore sedimentary basin of Strimonikos - Orfanos Gulf. The main stages of the research were based on an extensive literature review of the existing published studies and technical reports carried out in exploration drilling areas during the 1970s and 1980s, as well as the elaboration, interpretation, analysis and synthesis of two databases (i.e., one for the respective area of interest) of two-dimensional multichannel seismic reflection profiles. The data was managed and processed using DUG Insight software suite provided by Down Under Geosolutions (DUG).
The study of the North Aegean Trough, was based on 11, deep penetrating, multichannel seismic reflection profiles. Due to the geometry of the data-set as well as the complex physiology of the trough, the study was carried out in four sub-areas: a) the southern margin of the Thermaikos Gulf, b) the western Sporades, c) the area south of the Sithonia and Athos peninsulas and d) the eastern Sporades. The seismic-stratigraphic study of the four areas in the trough identified a total of eight seismic packages. Data from four exploratory wells in the areas of Thermaikos Gulf and the Kassandra Peninsula were used to correlate the packages and their relative dating from the Paleogene to the Quaternary.
The partial mapping of the Oligocene and Eocene was limited to the southern margin of Thermaikos. At the same time, unconformable extent of the L - M. Miocene series is obvious. In contrast to Thermaikos Gulf, the seismic stratigraphic mapping in the other areas was limited down to Upper Miocene. Along the region, changes in the character of seismic phases are identified between the stratigraphic packages which are related to tectonic processes as well as to different depositional environments. The U. Miocene packages presents a characteristic difference between the western and eastern margins of the studied area, where the possible deposition of evaporitic formations south of the Athos peninsula is postulated. The mapping of three major fault zones at the northwestern and southwestern margin of the trough is presented. In addition, the intense deformation of the Upper Miocene - Pliocene f packages at the southwestern end of the trough, is associated with the western propagation of the North Anatolian Fault in the Aegean.
For the study of Strimonikos Gulf, 8 multi-channel seismic reflection profiles were used. In addition, three printed profiles were processed and digitized in order to enhanced the seismic interpretation of the area. As in the case of the North Aegean Trough, the lithostratigraphic evidence of three exploration wells, were used to correlate the four mapped seismic packages. Overall, the basin extends to a NW-SE axis and its evolution shows asymmetric growth. The western areas are characterized by thinner packages, which gradually increase to the northeast and southeast, while lateral changes in the seismic facies of the formations are detected. In the eastern margin of the basin, evaporitic formations similar to the Prinos sub-basin are found while the intense subsidence of the basin and its parallel filling during the Quaternary is evident.

Science

Seismic Stratigraphy, Offshore Sedimentary Basins, NW Aegean, North Aegean Trough, Strimonikos Gulf.

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https://pergamos.lib.uoa.gr/uoa/dl/object/2961270