Author(s)

Chao Han¹, Kangle Ding^1,2,3*, Yan Liu⁴, Fujia Guan⁵, Mei Zou¹, Zhenzhen Yu¹, Yi Wu¹

¹Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan Campus, Wuhan, China.
²Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao, China.
³College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, China.
⁴College of Resources and Environment, Yangtze University, Wuhan Campus, Wuhan, China.
⁵College of Petroleum Engineering, Yangtze University, Wuhan Campus, Wuhan, China.

The kinetic characteristics of alkenes involved in thermochemical sulfate reduction (TSR) have been never reported in geological literature. In this study, TSR by ethene under hydrothermal conditions was performed in the constrained simulation experiments. Typical TSR products consisted of H₂S, CO₂, mercaptans, sulfides, thiophenes derivatives and benzothiophene. The apparent activation energy E and apparent frequency factor A for TSR by ethene were determined as 76.370 kJ/mol and 4.579 s^-1, respectively. The lower activation energy for ethene involved in TSR relative to ethane suggested that the reactivity of ethene is much higher than that of ethane, in accordance with the thermodynamic analysis. Rate constants were determined experimentally using first-order kinetics extrapolate to MgSO₄ half-lives of 67.329 years - 3.053 years in deep burial diagenetic settings (120°C - 180°C). These values demonstrate that the reaction rate for TSR by ethene is extraordinarily fast in high-temperature gas reservoirs (120°C - 180°C). Consequently, the newly formed ethene from thermal cracking and TSR alteration of natural gas and/or petroleum could not survive after TSR process and were rarely detected in natural TSR reservoirs.

Thermochemical Sulfate Reduction (TSR), Ethene, Simulation Experiments, Thermodynamic Analysis, First-Order Kinetics

Han, C. , Ding, K. , Liu, Y. , Guan, F. , Zou, M. , Yu, Z. and Wu, Y. (2020) Experimental Investigation on Hydrothermal Reduction of Sulfates to H₂S and Organic Sulfides by Ethene. Open Journal of Yangtze Oil and Gas, 5, 188-199. doi: 10.4236/ojogas.2020.54015.