Experiments on the generation of dimethyldibenzothiophene and its geochemical implications

WU Jia; QI Wen; LUO Qingyong; CHEN Quan; SHI Shengbao; LI Meijun; ZHONG Ningning

doi:10.11781/sysydz201902260

Volume 41 Issue 2

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Article Navigation > PETROLEUM GEOLOGY & EXPERIMENT > 2019 > 41(2): 260-267

WU Jia, QI Wen, LUO Qingyong, CHEN Quan, SHI Shengbao, LI Meijun, ZHONG Ningning. Experiments on the generation of dimethyldibenzothiophene and its geochemical implications[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2019, 41(2): 260-267. doi: 10.11781/sysydz201902260

Citation:

WU Jia, QI Wen, LUO Qingyong, CHEN Quan, SHI Shengbao, LI Meijun, ZHONG Ningning. Experiments on the generation of dimethyldibenzothiophene and its geochemical implications[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2019, 41(2): 260-267. doi: 10.11781/sysydz201902260

Citation:

WU Jia, QI Wen, LUO Qingyong, CHEN Quan, SHI Shengbao, LI Meijun, ZHONG Ningning. Experiments on the generation of dimethyldibenzothiophene and its geochemical implications[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2019, 41(2): 260-267. doi: 10.11781/sysydz201902260

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Experiments on the generation of dimethyldibenzothiophene and its geochemical implications

doi: 10.11781/sysydz201902260

WU Jia^1,2,
QI Wen^3,4,
LUO Qingyong^1,2,
CHEN Quan^1,2,
SHI Shengbao^1,2,
LI Meijun^1,2,
ZHONG Ningning^1,2

1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
2. College of Geoscience, China University of Petroleum, Beijing 102249, China;
3. University of Chinese Academy of Science, Beijing 100049, China;
4. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou, Gansu 730020, China

Received Date: 2018-08-17
Rev Recd Date: 2019-01-25
Publish Date: 2019-03-28

Abstract

Abstract

Dibenzothiophene (DBT) and its homologues are important molecular markers in petroleum geochemistry. However, DBT-related geochemical indicators were derived mainly based on empirical observations due to insufficient understanding of the mechanisms through which these organosulfur compounds were generated in sedimentary environments. Thermal simulation experiments with 3,3’-dimethylbiphenyl and sulfur in closed gold tubes at 200-500 ℃ and 10 MPa afforded three main dimethyldibenzothiophene isomers (DMDBTs). Importantly, DBTs could be generated at a temperature as moderate as 200 ℃ under geological conditions, because the temperature threshold of the reaction could be reduced by increasing the system pressure. Further investigations revealed that the regioselectivity of the thiophene formation reaction was strongly influenced by temperature. This is similar to the process that occurs in natural geological systems. It should also be noted that the maturity index 4-/1-MDBT (MDR) reaches a maximum around 1.5% (Easy%R_o). It indicates that MDR index should be used in a suitable maturity regions combined with the given geological setting.
- dibenzothiophene,
- generation mechanism,
- thermal simulation,
- maturity

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References(40)

References

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Experiments on the generation of dimethyldibenzothiophene and its geochemical implications

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