In the past few years, scientific research related to the hydrocarbon potential in Greece has been focused on the formations of the Ionian Unit in the western areas of the country, where oil-seepages are well known. In contrast, Parnassos-Ghiona geotectonic Unit (PGU), Central Mainland Greece, has mainly been studied for the presence of bauxite ores. However, Upper-Cretaceous organic-rich strata, including local coal lenses, are occurring on top of the b3 bauxite horizon across PGU. In the present study, two underground mine sites, at Vagoneto and Gouves, where coal lenses occur, as well as an outcrop of the b3 bauxite horizon and the overlying gray limestone (PBF section) have been studied by means of organic petrology, mineralogy and inorganic geochemistry, as well as Rock-Eval analysis. The aim of the study is to evaluate the palaeoenvironmental conditions that favoured the organic matter accumulation subsequently to the bauxite formation, as well as the assessment of the hydrocarbon potential of the Upper Cretaceous strata within PGU. The study of the sections of interest revealed the establishment of three different modes of organic matter depositional settings, including paralic mires on the top of the lateritic mud deposition, paralic mires developed upon the Lower Cretaceous limestone bedrock, as well as shallow-marine basins with limited water circulation, followed by a deepening trend upwards. The low/very low grade humic coal lenses at the Vagoneto and Gouves sites formed by accumulation of mostly herbaceous plants, being characterized by elevated amounts of detrovitrinite and inertinite, and variable amounts of liptinites usually in the form of sporinite and alginite. Accordingly, the Rock-Eval data indicate the occurrence of all kerogen types, with the Types III and IV generally prevailing. The overall coal-petrographic data indicate intense oxidation in the palaeo-mires, possibly related to the dry warm Turonian climate and/or the influence of brackish waters. Additionally, the thermal maturity derived from both vitrinite reflectance and Rock-Eval analysis, point to Medium Rank Bituminous coals or, in terms of hydrocarbon generation, to the early oil window stage. The data suggest a good-to-excellent gas potential for Parnassos-Ghiona Unit, whereas the oil-potential seems to be limited.

在过去的几年里，与希腊碳氢化合物潜力相关的科学研究一直集中在该国西部地区的爱奥尼亚单元的地层上，该地区的石油渗漏是众所周知的。相比之下，希腊中部大陆的 Parnassos-Ghiona 大地构造单元 (PGU) 主要研究铝土矿的存在。然而，包括局部煤透镜体在内的上白垩统富含有机物地层出现在 PGU 的 b3 铝土矿层顶部。在本研究中，通过有机岩石学、矿物学和无机地球化学，以及 Rock-Eval 分析。该研究的目的是评估有利于有机质在铝土矿形成之后积累的古环境条件，以及对 PGU 内上白垩统地层的油气潜力的评估。对感兴趣剖面的研究揭示了三种不同模式的有机质沉积环境的建立，包括红土泥沉积顶部的副泥沼、下白垩统石灰岩基岩上发育的副泥沼以及具有水循环受限，随后呈上升趋势。Vagoneto 和 Gouves 地点的低/极低品位腐殖煤透镜体由主要是草本植物的堆积形成，其特征是大量的 detrovitrinite 和 inertinite，和数量不等的亮晶石，通常以孢子石和海藻石的形式出现。因此，Rock-Eval 数据表明存在所有类型的干酪根，其中 III 型和 IV 型普遍占优势。整体煤岩相数据表明古泥沼中的强烈氧化，可能与干燥温暖的 Turonian 气候和/或咸水的影响有关。此外，从镜质体反射率和 Rock-Eval 分析得出的热成熟度指向中品位烟煤，或者就碳氢化合物生成而言，指向早期石油窗口阶段。数据表明 Parnassos-Ghiona 装置的天然气潜力从优良到优良，而石油潜力似乎有限。以 III 型和 IV 型普遍流行。整体煤岩相数据表明古泥沼中的强烈氧化，可能与干燥温暖的 Turonian 气候和/或咸水的影响有关。此外，从镜质体反射率和 Rock-Eval 分析得出的热成熟度指向中品位烟煤，或者就碳氢化合物生成而言，指向早期石油窗口阶段。数据表明 Parnassos-Ghiona 装置的天然气潜力从优良到优良，而石油潜力似乎有限。以 III 型和 IV 型普遍流行。整体煤岩相数据表明古泥沼中的强烈氧化，可能与干燥温暖的 Turonian 气候和/或咸水的影响有关。此外，从镜质体反射率和 Rock-Eval 分析得出的热成熟度指向中品位烟煤，或者就碳氢化合物生成而言，指向早期石油窗口阶段。数据表明 Parnassos-Ghiona 装置的天然气潜力从优良到优良，而石油潜力似乎有限。指向中品级烟煤，或者就碳氢化合物生成而言，指向早期石油窗口阶段。数据表明 Parnassos-Ghiona 装置的天然气潜力从优良到优良，而石油潜力似乎有限。指向中品级烟煤，或者就碳氢化合物生成而言，指向早期石油窗口阶段。数据表明 Parnassos-Ghiona 装置的天然气潜力从优良到优良，而石油潜力似乎有限。