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Photomicrographs of C-1 Socu Upper Badenian source rocks of the Getic Depression showing vitrinite associated with mixed, continental, and marine origins liptinite in a mineral groundmass with pyrite. Reflected light (RL: figures A,C,E) and fluorescence (FL: figures B,D,F), oil immersion, 500×. Py: pyrite, MC: mineral carbonate.
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![Stratigraphic log of the Getic Depression, Romania, simplified after [60].](publication/367553736/figure/fig2/AS:11431281417936486@1746137340076/Stratigraphic-log-of-the-Getic-Depression-Romania-simplified-after-60_Q320.jpg)
The aim of this study is to evaluate the thermal maturity of Upper Badenian (Middle Miocene) petroleum source rocks of the Getic Depression, Romania, and to characterize the dispersed organic matter using organic petrography associated with Rock-Eval pyrolysis. A total of 33 core samples of Upper Badenian source rocks from the central–southern part...
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... From a geological point of view, the site containing Corbii de Piatrǎ Monastery is located in the Getic Depression (Figure 2), a narrow sedimentary basin in the Southern Carpathian foreland with sediments from the Cretaceous to Miocene ages [14]. The monastery was excavated in massive sandstones of the Oligocene age, which belong to the Corbi Formation [9,15]. ...
... From a geological point of view, the site containing Corbii de Piatrǎ Monastery is located in the Getic Depression ( Figure 2), a narrow sedimentary basin in the Southern Carpathian foreland with sediments from the Cretaceous to Miocene ages [14]. The monastery was excavated in massive sandstones of the Oligocene age, which belong to the Corbi Formation [9,15]. ...
... Before AMS analysis, the samples were converted into graphite by combustion using the AGE 3 graphitization installation [38], which works in conjunction with the elemental analyzer (VarioMicroCube, Elementar, Hanau, Germany)™. The experimental data obtained for all the samples were normalized against NIST SRM 4990C-Oxalic Acid II (NIST SRM 4990C International Standard Reference Material for Contemporary Carbon- 14,1983) to the modern radiocarbon level, while to estimate the blank level, a fossil coal of Romanian origin was used. By measuring the 13C/12C ratio, the results were also corrected by δ13C parameters determined by AMS data processing software version 4.06 (according to A-4-35-501-7621 Rev. A Operator Manual 1.0 MV Tandetron for AMS B7621 IFIN-HH Magurele, Romania, page 73), representing the cumulative isotopic fractionation of all physico-chemical processes on the analysis chain. ...
The stone Ensemble from Corbii de Piatrǎ Romania arouses a continuous scientific interest, with the final goal being to obtain an exhaustive and multidisciplinary package of results that will become the support of an extensive restoration project. The cave painting stands out as the most important and most affected by the advanced degradation among the historical monuments in Romania. This article provides for the first time a radiocarbon dating of the first forms of painting by establishing the age of the mortar/plaster used as a pictorial support. Being a very complex context from the point of view of the type of datable material and the disappearance over time through degradation of other elements that would ensure a simpler and more reliable radiocarbon dating (such as the straws used to form the material), it was necessary to use a multidisciplinary approach for the selection of samples and for supporting the radiocarbon results. The set of analyses consisted of visualization techniques through microscopy and compositional analysis, providing information on the similarities/differences between the samples, the degradation mechanisms/impurities and the quality of the calcium carbonate dated by the Accelerator Mass Spectrometry (AMS) technique. The results supported each other, ensured the selection of reliable radiocarbon data and established the most probable moment of the early interventions, namely the two phases corresponding to the 14th century.
В данной статье рассмотрены закономерности распространения скоплений углеводорода на основе геохимических исследований. Показано, что анализ результатов индивидуального состава биомаркеров наряду с изучением изотопного состава углерода нефтей месторождений Арыскумского прогиба современными хроматографическими и масспектрометрическими методами позволяет создать представления о нефтегенерационном потенциале юрских отложений для прогноза неоткрытых ресурсов углеводородов в Арыскумском прогибе. Выявленные особенности состава углеводородов из нижней юры Арыскумского прогиба свидетельствуют о более высоком окислительно-восстановительном потенциале среды осадконакопления. Изученные нефти по своей термической преобразованности отличаются незначительно и относятся к категории «зрелые
Бұл мақалада геохимиялық зерттеулер негізінде көмірсутектер жинақтарының таралу заңдылықтары қарастырылған. Биомаркерлердің жеке құрамының нәтижелерін талдау қазіргі заманғы хроматографиялық және масспектрометриялық әдістермен Арысқұм иілісі кен орындарының көміртегі мұнайының изотоптық құрамын зерттеумен қатар Арысқұм иілуіндегі көмірсутектердің ашық емес ресурстарын болжау үшін юра шөгінділерінің мұнай генерациялық әлеуеті туралы түсінік қалыптастыруға мүмкіндік беретіні көрсетілген. Арысқұм иілісінің төменгі юра сынаналынған көмірсутектер құрамының анықталған ерекшеліктері тұндыру ортасының жоғары тотығу-тотықсыздану әлеуетін көрсетеді. Зерттелген мұнайлар термиялық түрленуі бойынша шамалы ерекшеленеді және «жетілген» санатына жатады
In this article, the regularities of the distribution of hydrocarbon accumulations based on geochemical studies are considered. It is shown that the analysis of the results of the individual composition of biomarkers, along with the study of the carbon isotope composition of the Aryskum depression oil fields by modern chromatographic and mass spectrometric methods, allows us to create ideas about the oil and gas generation potential of Jurassic sediments for the prediction of undiscovered hydrocarbon resources in the Aryskum depression.The revealed features of the composition of hydrocarbons from the Lower Jurassic of the Aryskum depression indicate a higher redox potential of the sedimentation medium. The studied oils differ slightly in their thermal transformation and belong to the category of «mature»
This study predicts favorable oil and gas source-rock formation conditions in the Aryskum Depression of the South Turgay Basin, Kazakhstan. This study assesses the thermal maturity and characteristics of organic matter by determining its environmental conditions using data from geochemical analysis of core (pyrolysis) and oil (biomarkers and carbon isotopic compositions) samples. According to the geochemical parameters obtained by pyrolysis, the oil generation potential of the original rocks of most studied samples varies from poor to rich. The facies–genetic organic matter is predominantly humic and less frequently humus–sapropel, indicating organic matter accumulation in the studied samples were under moderately reducing conditions (kerogen III and II types) and coastal–marine environments (kerogen type I). The carbon isotopic compositions of oils derived from the Jurassic deposits of the Aryskum Depression also indicate the sapropelic and mixed humic–sapropelic type of organic matter (kerogen II and I). Biomarker analysis of oils indicates original organic matter formation in an anoxic environment.
