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Identification and Geochemical Application of Thiadiamondoids in Crude Oil(PDF)


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Identification and Geochemical Application of Thiadiamondoids in Crude Oil
CHEN Zhong-hong1 ZHANG Ping1 CHAI Zhi1 SUI Ming-yang2
( 1. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China; 2. Hekou Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257200, Shandong, China)
thiadiamondoid δ34S value identification formation mechanism thermal stability thermochemical sulfate reduction process division of crude oil group
P618.13; TE122
Thiadiamondoids are commonly found in crude oil. Because of their unique molecular structure and formation process, the thiadiamondoids are widely used in petroleum industry. The research progress and existing problems in identification, formation mechanism, thermal stability and application in oil and gas fields were summarized systematically. The results show that there are mainly two formation mechanisms of thiadiamondoids at present in crude oil, including hydrocarbon evolution of source rocks and thermochemical sulfate reduction(TSR)process, the first one can generate the initial small amount thiadiamondoids in crude oil, and TSR process can further form large amount thiadiamondoids; the higher the number of cages are, the higher the thermal stability of thiadiamondoids is, and the thermal cracking can occur in the high thermal maturity; thiadiamondoids are enriched with the enhancement of TSR process, thus can be regarded as reliable molecular markers of TSR process; δ34S values of thiadiamondoids can be changed by TSR process, which can reflect the genetic type of TSR process; the initial content and δ34S value of thiadiamondoids in crude oil without TSR process represent the characteristics of original source rocks, and can be applied to the division of crude oil group. According to the current research status, the specific formation mechanism and detailed thermal stability limit of thiadiamondoids are not clear; when the contents of thiadiamondoids are used to identify TSR process, it is necessary to combine sulfur isotope and other parameters; the study on thiadiamondoids is mainly focused on identification of TSR process, but the application on oil-oil and oil-source correlations needs to be further strengthened.


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