Περίληψη:
This study presents the results derived from micropaleontological and organic geochemical analyses of mud breccia samples obtained (through gravity coring) from five mud volcanoes (Gelendzhik, Heraklion, Moscow, Milano, Leipzig) located at the Olimpi mud volcano field on the Mediterranean Ridge accretionary complex. A thorough calcareous nannofossil semi‐quantitative analysis was performed to determine the biostratigraphic assignment of the deep‐seated source strata. Mudstone/shale clasts of different stratigraphic levels were identified and assigned to the Miocene nannofossil biozones CNM10, CNM8–9, CNM7, CNM6–7, and Oli-gocene CNO4/CNO5. A single mudstone clast from the Gelendzhik plateau, assigned to the bi-ozone CNM10, demonstrated unique micropaleontological and geochemical characteristics, sug-gesting a sapropelic origin. Subsequently, the total organic carbon (TOC) content and thermal maturity of the collected mud breccias was evaluated using the Rock‐Eval pyrolysis technique, and their oil and gas potential was estimated. The pyrolyzed sediments were both organic rich and organic poor (TOC >0.5% or <0.5%, respectively), with their organic matter showing characteristics of the type III kerogen that consists of adequate hydrogen to be gas generative, but insufficient hydrogen to be oil prone. However, the organic matter of the late Serravallian (CNM10) sapropelic mudstone was found to consist of a mixed type II/III kerogen, implying an oil‐prone source rock. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Συγγραφείς:
Nikitas, A.
Triantaphyllou, M.V.
Rousakis, G.
Panagiotopoulos, I.
Pasadakis, N.
Hatzianestis, I.
Gogou, A.
Λέξεις-κλειδιά:
Analytical geochemistry; Biogeochemistry; Biostratigraphy; Hydrogen; Kerogen; Oil shale; Organic carbon; Sedimentary rocks, Accretionary complex; Calcareous nannofossil; Geochemical analysis; Geochemical characteristic; Geochemical evidence; Mediterranean Ridge; Pyrolysis technique; Total Organic Carbon, Volcanoes, biostratigraphy; breccia; deposition; ecozone; field method; geochemistry; Mediterranean environment; Messinian; micropaleontology; mud volcano; nanofossil; pyrolysis; quantitative analysis; thermal maturity, Aegean Islands; Crete [Greece]; Gelendzhik; Germany; Greece; Idaho; Iraklion [Crete]; Iraklion [Iraklion (DPR)]; Italy; Krasnodar [Russian Federation]; Leipzig; Lombardy; Mediterranean Ridge; Mediterranean Sea; Milano [Lombardy]; Moscow [Idaho]; Russian Federation; Saxony; United States
