从烃源岩热模拟实验讨论其生烃特征  

An Analysis of Characteristics of Hydrocarbon Generation from Pyrolysis Experiment of Source Rock

作　　者：肖芝华[1] 胡国艺[2] 李志生[2] 

机构地区：[1]中国石油大学资源与信息学院石油天然气成藏机理教育部重点实验室,北京102249 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《天然气地球科学》2008年第4期544-547,共4页Natural Gas Geoscience

基　　金：国家科技攻关项目(编号:2004BA616A02)资助

摘　　要：采用开放体系下进行的全岩热模拟实验，对塔里木盆地哈2井三叠系的黑色泥岩开展了产气率变化特征的研究，并结合成熟度及其显微组分的变化，探讨了烃源岩的生排烃过程。模拟实验结果表明：加温在400℃以前，RO值低于0．8％，累积产气率仅1．04mL／g，所产烃气仅占总产气率的8．2％；加温到600℃时，累积产气率达9．23mL／g，占总产气率的72．7％；生烃高峰在500～600℃之间，此时阶段产气率为6．23mL／g，占总产气率的49．1％，大致相当于RO值为1．24％～1．78％，此阶段所生烃气约占总产气率的一半；700℃以后镜质组等腐殖组分仍可生成相当数量烃气，但已进入干气阶段，大量生烃阶段基本结束。By means of thermal simulating experiment in the open system, this article focused on the hydrocarbon-generating characteristics of Trias source rock from well Ha 2 in Tarim basin, it also combined with the alteration of maceral and maturation to discuss the characteristics of generating hydrocarbon. The re- sult of experiment indicate that the accumulative yield is only 1.04 mL/g when the heating temperature is under 400℃ （ value of RO is below 0.8%）, it only reach to 8.2% of the total gas yield. When the heating temperature reaches 600℃, the accumulative yield is 9.23 mL/g （about 72.7% of the total gas yield）. The peak yield of hydrocarbon is between the heating temperature 500℃ and 600℃ （the value of RO is from 1.24% to 1.78%）, the periodical yield in this evolution period is 6.23 mL/g （about 50℃ of the total gas yield）. Although the humin component still could generate hydrocarbon when the heating temperature reaches 700℃, it has already been entered into the period of dry gas. The period of large quantity of generation has finished.

关 键 词：开放体系 热模拟 产气率 显微组分 

分 类 号：TE122.113[石油与天然气工程—油气勘探]