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Diamondoid Hydrocarbons as Maturity Indicators for High Maturity Crude Oils and Condensates (CROSBI ID 734634)

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Marinović, Slavica ; Biondić, Mirna Diamondoid Hydrocarbons as Maturity Indicators for High Maturity Crude Oils and Condensates // SCI Synopsis: European Congress on Chemistry and Applied Sciences. 2023. str. 49-49

Podaci o odgovornosti

Marinović, Slavica ; Biondić, Mirna

engleski

Diamondoid Hydrocarbons as Maturity Indicators for High Maturity Crude Oils and Condensates

Thermal maturity is an important parameter in assessing petroleum evolution in sedimentary basins. The type of hydrocarbons generated (oil or gas) depends on the type of organic matter (type of kerogen) present in the rock, and to some extent, its maturation history. During sediment deposition, organic matter is exposed to elevated temperatures and pressures. The change of kerogen to petroleum under this condition over a long period is also known as maturation. These changes mainly include temperature reactions of cracking or pyrolysis (thermal cracking) of large molecules, and the formation of smaller molecules with lower energy content and increased stability. Determination of thermal maturity level of the organic matter source rocks and hydrocarbons in the reservoir is very important in source rock-oil correlation studies, and in solving the very complex problem of hydrocarbon migration from the source rocks to the reservoir rocks. Diamondoid hydrocarbons having the general molecular formula C4n+6H4n+12, are a class of saturated hydrocarbons that consist of three- dimensionally fused cyclohexane rings, which results in a diamond-like structure. Diamondoids show extreme thermal stability during exposure to high temperatures, therefore these compounds are used in the determination of thermal maturity of high maturity crude oils and condensates. These compounds are more stable than any other hydrocarbons, and once formed, are also resistant to biodegradation processes. Most “normal” oil samples have a high concentration of other biomarkers (hopanes and steranes), and a low concentration of diamondoids. Conversely, highly mature samples of crude oil and condensate generally contain a high concentration of diamondoids, and very low concentration of other biomarkers or in some cases are completely absent. During cracking to which hydrocarbons are exposed at high temperatures and pressures, diamondoids remain concentrated in condensate samples due to their extreme thermal stability compared to other groups of hydrocarbons. Diamondoid hydrocarbons were determined using gas chromatography-mass spectrometry in different concentrations and use of diamondoids as an indicator of the thermal maturity of hydrocarbons is based on different thermal stability of the methyl isomer of diamondoids.

Diamondoids hydrocarbons, thermal maturity, crude oil, condensate

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Podaci o prilogu

49-49.

2023.

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objavljeno

Podaci o matičnoj publikaciji

SCI Synopsis: European Congress on Chemistry and Applied Sciences

Podaci o skupu

European Congress on Chemistry and Applied Sciences

poster

20.03.2023-21.03.2023

Rim, Italija

Povezanost rada

Kemija