加热时间对生烃模拟过程的影响

AFFECTION OF TIME TO HYDROCARBON-GENERATING SIMULATION

通过 36 0℃、不同模拟时间下生油岩生烃演化过程的分析 ,探讨了加热时间对模拟结果的影响。发现延长加热时间 ,气体产率将不断增加 ,其中总烃气增加幅度大于非烃气体。同时丁烷、戊烷和 C+ 5烃类含量在时间很长时发生裂解生成更小分子的甲烷、乙烷和丙烷。随模拟时间的延长 ,非烃气中除氢气含量随加热时间延长而增加外 ,其余非烃气包括二氧化碳、氮气、氧气和一氧化碳等气体和液态产物产率降低 ,干酪根元素组成中 x( H) /x( C)值和 x( O) /x( C)值不断降低 ,而镜质体反射率变化不明显。

By analysis of hydrocarbon- generating simulation results of source rock at360℃ and differenttime,the authors research the affection of time to hydrocarbon- generating simulation of source rock. With pyrolysis time lasting,gasyield increases,incremental extentof total hydrocarbon gasyield isgreaterthan thatof total gas and the gasoeus hydrocarbons whose molecule mass is greatercrack into the hydrocarbonswhosemolecule mass is lower.In gaseous nonhydrocarbons,content percent of volume of dioxide carbon,nitrogen,oxygen and oxide carbon decrease except content percentof hydrogen increasing with time continuing. The ratio of hydrogen to carbon and the ratio of oxygen to carbon decrease and variation of vitrinite reflectance isweaker when pyrolysis time increases.