Genetic Origin of Sulfate Compounds in H2S Bearing Gas Reservoirs of Sichuan Basin,China
Received date: 2013-10-21
Revised date: 2013-11-26
Online published: 2014-01-10
By measuring the concentration of the sulfate compounds (i.e H2S,thiophane,thiol,carbonyl sulfide) in natural gas from Sichuan Basin,H2S was derived from the oil cracking and thermochemical sulfate reduction (TSR),and the high H2S content is related to the alteration of TSR later.The thiophane in natural gas was decomposed from the hydrocarbons under the thermodynamic conditions,and not related with the kerogen types and TSR alteration.The thiophane still exists in the gas reservoirs with high temperature due to its good thermal stability.In the condensate gas reservoirs,the abundant thiol compounds were formed from the hydrocarbons under thermodynamic or thermol-catalytical conditions or TSR alteration.The high H2S content (H2S >15%) would constrain the formation of the thiol compounds or the thermal decomposition of thiol compounds would be faster than the H2S formation.The carbonyl sulfide (COS) was transferred from the SO2 under the lanthanum catalysis,which was different from the formation of thiophane and thiol.Additionally,the COS was an intermediate product during the H2S formation.
Key words: Sichuan Basin; Sulfate compounds; TSR; Thermal decomposition; Thermal stability
LIU Quan-you,JIN Zhi-jun,WU Xiao-qi,LIU Wen-hui,ZHANG Yong-feng,ZHANG Dian-wei,GAO Bo . Genetic Origin of Sulfate Compounds in H2S Bearing Gas Reservoirs of Sichuan Basin,China[J]. Natural Gas Geoscience, 2014 , 25(1) : 33 -38 . DOI: 10.11764/j.issn.1672-1926.2014.01.33
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