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有机质成熟度是评价烃源岩和油气演化的地球化学参数之一,沉积岩中镜质体反射率的分析测定对于油气发现具有重要意义。中国下古生界海相烃源岩地层有机质丰度低,演化程度高,缺乏典型的镜质体,因而常规的海相有机地球化学演化指标不适用。应用海相烃源岩镜状体反射率分析测定方法实验,然后将测定结果换算为等效的镜质体反射率,从而标定出海相烃源岩的有机质成熟度。应用此方法对塔里木盆地满加尔地区中下奥陶统—寒武系烃源岩进行了评价,并且恢复了古城地区和塔东隆起区的烃源岩成熟史。
Maturity of organic matter is one of the geochemical parameters for evaluating the evolution of source rocks and oil and gas. The analysis of vitrinite reflectance in sedimentary rocks is of great significance for oil and gas discovery. The Lower Paleozoic marine source rock strata in China have low organic matter abundance, high degree of evolution and lack of typical vitrinite. Therefore, conventional marine organic geochemical evolution indices are not applicable. In this paper, the experiment on the method of specular reflectance analysis of marine source rocks is applied. Then the results are converted into the equivalent vitrinite reflectance to demarcate the organic matter maturity of marine source rocks. This method was applied to evaluate the Middle-Lower Ordovician-Cambrian source rocks in Mange area, Tarim Basin, and to restore the maturity history of source rocks in the ancient city area and the Tadong uplift area.