伊利石结晶度在恢复地层剥蚀量中的应用--以合肥盆地安参1井白垩系剥蚀量的恢复为例

针对合肥盆地勘探程度低、地热史资料缺乏的现状,提出利用伊利石结晶度与埋藏深度和成岩温度之间的对应关系来确定古地温梯度,进而利用温度资料求取原始地层厚度和剥蚀量,并利用包裹体测温和镜质体反射率两种方法计算出安参1井白垩系的原始地层厚度和剥蚀量,其结果具有较好的可比性,为深化盆地下侏罗统和下白垩统烃源岩的热演化研究提供了保证.

Application of Crystallinity of Illite to Recover Denudation Quantity:An Example of Cretaceous Denudation Quantity Recovery of Well Ancan 1 in Hefei Basin,Anhui Province

In Hefei Basin,low exploration degree and shortage of thermal history information affected the thermal evolution research.This article shows that the palaeogeothermal gradient of Mesozoic can be determined by the correspondence relationship between the crystallinity of illite and burial depth and diagenetic temperature,and that the original Cretaceous thickness and denudation quantity can be obtained either by vitrinite reflectance or the temperature getting from inclusion measurements,which can be well compared with each other. All these work can ensure the further Lower Jurassic and Lower Cretaceous resource thermal evolution research.