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

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

仇福康

Chou Fukang

同济大学 上海 200092

Tongji University, Shanghai

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。

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.

https://doi.org/10.11781/sysydz199301029