镜质组反射率在推算古地温和恢复地层剥蚀厚度方面的研究与进展

Application and Progress of Vitrinite Reflectance Method for Calculation of Paleo Geo-Temperature and Restoration of Eroded Strata Thickness

为进一步探讨镜质组反射率在沉积盆地演化过程中推算古地温和恢复地层剥蚀厚度的作用,通过查阅大量文献,对比分析了近年来国内外含煤及油气沉积盆地研究中常用的镜质组反射率方法及其适用性,阐述了各种镜质组反射率分析法的基本原理。研究结果表明,准确的测定方法是保证镜质组反射率数值正确的前提;采用镜质组反射率恢复地层剥蚀厚度,必须基于对研究区地质构造背景的完全理解,避免因其多解性造成分析结果错误;当油浸镜质组反射率值超过4.0%,原则上该参数不再适合于古地温推算及地层剥蚀厚度的恢复。将镜质组反射率方法用于含煤沉积盆地固体有机质演化阶段分析是一个值得探索的研究方向。

For further discussion of application and progress of vitrinite reflectance（VR）for calculation of the paleo geo-temperature and restoration of eroded strata thickness in the evolution of sedimentary basin,the paper contrasted some common VR methods and their applicability in the research of coal and oil gas bearing sedimentary basin by literature reviews at home and abroad in recent years.The principles of various VR methods were introduced.The results showed that the accurate determination is the precondition of the correct results of VR.To avoid mistakes caused by multiple solutions,the tectonic background of sedimentary basin should be studied thoroughly when the VR was used to restore the eroded strata thickness.However,the VR would not be suitable to calculate the paleo geo-temperature and restore the eroded strata thickness when it exceeded 4.0%.It would be a promising research direction to apply the VR in the analysis of the evolution stage of solid organic matters in the coal bearing sedimentary basin.