运用TTI法恢复地层原始沉积厚度——以华北晋西、中原地区为例

岩石中有机质的成熟度是它在埋藏史中热演化效应的累积,这种累积效应可用时间-温度指数(TTI值)或镜煤反射率(R°)表示。在取得某地区研究层的TTI(或R°)值及埋藏史后,就可反演出其最大埋深,恢复地层原始沉积厚度。此法的精度取决于地温、厚度及TTI或R°等参数,当研究区地质历史上发生多次降升和沉降时,必须进行深度校正和时间-温度的热校正。 

AN APPLICATION OF TTI IN RECONSTRUCTION OF ORIGINAL THICKNESS OF SEDIMENTARY SEQUENCES-A CASE STUDY OF THE WEST SHANXI AND NORTH HENAN AREAS

The maturity of organic matter in sedimentary rocks is the accumulating effects of thermal evolution in burial history. Such an accumulated effect could be expressed by time-temperature-index (TTI) or vitrinite reflectance (R°), The greatest burial depth and the original thickness of sedimentary sequences can be obtained by the method of reversion, once the TTI (or R°) and the burial history in certain areas are available. The precision of this method depends on the parameters, such as geothermics and thickness of sedimentary sequences, TTI,R°,etc.. If upliftings and sudsidings take place,you should make corrections both on the depth and the thermal effects of time-temperature.