KINETICS OF HYDROCARBON GENERATION OF MARINE SOURCE ROCKS IN SOUTH CHINA
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摘要: 利用Rock-Eval 6热解仪和Optkin动力学软件对中国南方海相烃源岩4种有机质类型样品进行了动力学分析,研究得出在相近演化阶段样品平均活化能是Ⅲ型>Ⅱ2型>Ⅱ1型>Ⅰ型,生烃能力是Ⅰ型>Ⅱ1型>Ⅱ2型>Ⅲ型,有效生烃期间(干酪根生烃转化率10%~90%)活化能跨度ΔEⅠ<15kJ/mol,15kJ/mol<ΔEⅡ1<20kJ/mol,20kJ/mol<ΔEⅡ2<30kJ/mol,ΔEⅢ>30kJ/mol,有效生烃温度跨度ΔTⅠ≤65℃,65℃≤ΔTⅡ1≤75℃,75℃≤ΔTⅡ2≤85℃,ΔTⅢ≥110℃.达到干酪根10%转化率的时间顺序是Ⅲ型最早,Ⅱ2型早于Ⅱ1型,Ⅰ型最晚.而完成90%干酪根转化率时间则是Ⅰ型早于Ⅱ1型,Ⅱ2型次之,Ⅲ型最晚.干酪根有机大分子结构特征和元素组成决定了其生烃活化能的频率分布特征,海相优质烃源岩具有快速生烃的特质.Abstract: With Rock-Eval 6 and Optkin kinetics software,the kinetics analysis on four types of kerogens of marine hydrocarbon source rocks in South China were carried out.The results showed that,in the similar maturity period,the hydrocarbon generation activation energy of kerogen was Ⅲ>Ⅱ2>Ⅱ1>Ⅰ;the ability of hydrocarbon generation was Ⅰ>Ⅱ1>Ⅱ2>Ⅲ;the span of generating effective hydrocarbon activation energy was ΔEⅠ<15kJ/mol,15 kJ/mol<ΔEⅡ1<20kJ/mol,20kJ/mol<ΔEⅡ2<30 kJ/mol,ΔEⅢ>30kJ/mol;the span of generating effective hydrocarbon temperature was ΔTⅠ≤65℃,65℃≤ΔTⅡ1≤75℃,75℃≤ΔTⅡ2≤85℃,ΔTⅢ≥110℃.The time of hydrocarbon generation conversion rate to reach 10% was Ⅲ<Ⅱ2<Ⅱ1<Ⅰ;and the type Ⅰ kerogen first reached to 90% conversion rate,and then the typeⅡ1,type Ⅱ2 and type Ⅲ of kerogen.The character of hydrocarbon generation activation energy distribution of kerogen was determined by their element composition and organic high molecular structure.The hydrocarbon generation speed of good marine source rocks was very fast.
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