下古生界高过成熟烃源岩成熟度指标--姥鲛烷异构化指数研究  

Study on Pristane Isomerization Index,a Possible Thermal Maturity Index for Highly and Overly Mature Source Rocks of the Lower Paleozoic

作　　者：吴应琴[1,2] 王永莉[1] 雷天柱[1] 马素萍[1] 王有孝[1] 文启彬[1] 夏燕青[1] 

机构地区：[1]甘肃省油气资源研究重点实验室(中国科学院地质与地球物理研究所兰州油气资源研究中心),中国科学院油气资源研究重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京100049

出　　处：《质谱学报》2014年第4期317-323,共7页Journal of Chinese Mass Spectrometry Society

基　　金：国家自然科学基金(41272147,41172169,41072107);中国科学院战略性先导科技专项(XDB03020405,XDA05120204);中国科学院知识创新工程重要方向项目(KZCX2-EW-104);构造与油气资源教育部重点实验室开放课题基金(TPR-2012-18);“西部之光”联合学者项目资助

摘　　要：采用GC/MS方法对准噶尔盆地高过成熟煤岩中的姥鲛烷非对映异构体进行分离与分析,并对其异构化指数与镜质体反射率的相关性进行研究。结果表明,姥鲛烷非对映异构体的异构化指数与镜质体反射率有着良好的线性关系,拟合优度r2为0.995 1。应用四川盆地高过成熟烃源岩进行验证,其点的分布均在相关区域范围内,偏差较小,拟合优度r2达到了0.897 9。因此,姥鲛烷非对映异构体的异构化指数可作为判识有机质高过成熟度的新指标,可为高过成熟烃源岩热成熟度判识的研究提供新途径。The separation and analysis of the diastereoisomers of pristine （2,6,10,14-tetra- methylpentadecane） in these highly and overly mature coal samples from the Junggar Basin were carried out by gas chromatography mass spectrometry （~GC/MS）, and the relativity of the pristane isomerization ratio （PIR） and the reflectances （Ro） of these coal samples were studied. The results show that the PIR keeps quite linear relation with the Ro, and the linearity is up to 0. 995 1. Furthermore, verified test with source rocks of the Sichuan Basin was conducted in laboratory scale. It has been proved by experiments that the model has a precision of 0. 897 9 in forecasting the test results. The results suggest that the PIR may be used as an new indicator of maturity for the highly and overly mature source rocks, and it provided a new way to identify the maturity of these highly and overly mature source rocks.

关 键 词：姥鲛烷 非对映异构体 异构化指数 成熟度指标 GC MS 

分 类 号：O657.63[理学—分析化学]