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

Autori
Marinović, Slavica ; Biondić, Mirna

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, prošireni sažetak, znanstveni

Izvornik
SCI Synopsis: European Congress on Chemistry and Applied Sciences / - , 2023, 49-49

Skup
European Congress on Chemistry and Applied Sciences

Mjesto i datum
Rim, Italija, 20.03.2023. - 21.03.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Diamondoids hydrocarbons, thermal maturity, crude oil, condensate

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA