热流体活动示踪标志及其地质意义——以莺歌海盆地为例

TRACE MARKER OF HOT FLUID FLOW AND THEIR GEOLOGICAL IMPLICATIONS A CASE STUDY OF YINGGEHAI BASIN

沉积盆地内热流体活动过程实际上是热流体聚集与散失的动平衡过程．热流体活动必然导致温度和压力以及化学条件的改变，尽管如此，沉积盆地内热流体活动的示踪难度较大．通过对莺歌海盆地典型实例的剖析，认为较为有效的方法就是通过热流体活动中的温度效应进行示踪研究．其中较为有效的参数有伊－蒙矿物的转换、镜质体反射率和有机物热解指标以及流体包裹体等．这些参数的不同形式的异常均指示了来自深部的热流体的活动．

The active hot fluid process in the sedimentary basin is in fact a dynamic balance between accumulation and expulsion of fluid flow. The hot fluid flow will necessarily result in the change of the temperature, pressure and chemical conditions. However, it is relatively difficult to trace the hot fluid flow within the sedimentary basin. In this paper, the Yinggehai basin is taken as an example to analyze the hot fluid flow. The research results show that a relatively effective way to trace the hot fluid flow within the sedimentary basin is to measure the temperature effect that occurs in the hot fluid flow. The relatively effective parameters are shown as follows: transfer from smectite to illite, vitrinite reflectance rate, thermal analysis of organic matters and fluid inclusions. The abnormal markers of these parameters in different forms all indicate the hot fluid flow from the deep.