Study on Secondary Hydrocarbon Generation of Ordovician Hydrocarbon Source Rock in Tarim Basin
Study on Secondary Hydrocarbon Generation of Ordovician Hydrocarbon Source Rock in Tarim Basin
复制标题
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Zheng Lunju
中科院分区：
文献类型：
--
作者：
Zheng Lunju
从海相烃源岩二次生烃机理和生排烃模式出发，以塔里木盆地奥陶系烃源岩为研究对象，通过对塔里木盆地奥陶系烃源岩的构造演化特征研究，认为典型构造单元奥陶系烃源岩具有二次生烃、不同原始成熟度和不同生烃期次的特征。根据塔里木盆地热演化和生烃史，选取天然条件下不同原始成熟度的奥陶系海相烃源岩，通过热压模拟，探讨了其二次生烃的模式，结果表明，奥陶系烃源岩的二次生烃潜力塔里木盆地烃源岩以原始成熟度为主，二次生烃产率随原始成熟度的增加呈规律性下降，低、中成熟烃源岩生排烃潜力高，生烃高峰相对晚，高成熟烃源岩生排烃潜力低;连续生烃量与一、二次生烃量之和的差异也受原始成熟度的控制;当原始到期日为中低时，在一、二次生烃过程中，生烃量和生烃潜力增加，原始成熟度高时，生烃量和生烃潜力降低。
With the view of mechanism of secondary hydrocarbon generation of marine source rock and pattern of hydrocarbon generation and expulsion,Ordovician hydrocarbon source rock was taken as the object in Tarim Basin.The characteristics of Ordovician hydrocarbon source rocks in typical structural units included secondary hydrocarbon generation and different original maturities and hydrocarbon generation stages according to the study on tectonic-thermal evolution and hydrocarbon generation histories in Tarim Basin.Ordovician marine hydrocarbon source rocks with different original maturities under the natural condition were selected to discuss the pattern of secondary hydrocarbon generation according to the thermal pressure simulation.The results showed that the secondary hydrocarbon generation potential of Ordovician hydrocarbon source rocks in Tarim Basin was dominated by original maturity;secondary hydrocarbon generation production rate decreased regularly with the increase of original maturity;the hydrocarbon generation and expulsion potential of hydrocarbon source rock with low and middle maturities was high and there was relatively later hydrocarbon generation peak,and the potential of rock with high maturities was low;the difference between the amount of continuous hydrocarbon generation and the sum of the first and secondary was also dominated by original maturity;when the original maturities were low and middle,the amount and potential of hydrocarbon generation increased during the process of the first and secondary hydrocarbon generation,and the amount and potential decreased when the original maturity was high.