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Characterization of Gas Pyrolysates from Different Types of Permian Source Rocks in Sichuan Basin

LIU Quan-you,JIN Zhi-jun,GAO Bo,ZHANG Dian-wei,TAO Ye(Exploration & Production Research Institute,SINOPEC,Beijing 100083,China)  
Different types of the Permian source rocks(argillaceous limestone,asphaltic limestone,shale and coal) in Sichuan basin with 10mLwater were subjected to isothermal pyrolysis in a seal stainless steel reactor at temperatures ranging from 300℃ to 550℃ with 50℃ intervals for a duration of 24 h.Gas yield vary significantly for the different types of source rocks.Total gas yield from argillaceous limestone as type Ⅰ kerogen(maximum value=4 226 m3/tTOC) is much higher than those from other source rocks,then from asphaltic limestone(maximum value=2 445.5 m3/tTOC).Coal has the lowest gas yield(maximum value=459.3 m3/tTOC).The total gas yield from shale as type Ⅲ kerogen is more than that from coal.The maximum yield of total hydrocarbon gas is from argillaceous limestone(765 m3/tTOC),then from shale(606.1 m3/tTOC).Similar yields of hydrocarbon gas from coal,crude oil and asphaltic limestone occur.The case that hydrocarbon gas yield from shale is higher than that from asphaltic limestone would be related to the generation of non-hydrocarbon gas(i.e.CO2) from thermal decomposition of carbonates besides hydrocarbons cracking in asphaltic limestone.Thus,the total gas yield from asphaltic limestone is relatively high,but the hydrocarbon gas yield comparatively low,suggesting that the hydrocarbon gas from asphaltic limestone would greatly stem from the thermal cracking of the dispersed soluble organic matter but not from the asphaltic limestone itself.By comparison among the gas yields from different source rocks,it can be concluded that argillaceous limestone as kerogen Ⅰ or shale as kerogen Ⅲ is in favor of hydrocarbon generation at low temperature,whereas coal and dispersed soluble organic matter have a long-term period of hydrocarbon generation,and thus generation of hydrocarbon gas from coal and dispersed soluble organic matter is good for hydrocarbons accumulation later.
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