【摘要】 对常用的Waples、Middleton及Easy%Ro模型,通过蒙特卡罗方法,得到了相应的简化模型.所有简化模型均表明镜质体反射率(Ro)主要受控于最高温度(Tmax),并且与最高温度附近的温度变化率(Hr)有关.通过对简化模型的比较发现:(1)相对于Easy%Ro模型而言,Waples、Middleton模型对Hr的变化更为敏感;(2)总的来讲,达到相同的Ro值Middleton模型需要的温度最高,Easy%Ro模型其次,Waples模型需要的温度最低.在一定条件下,根据简化模型,利用实测的lnRo-H数据可以求取地层经历的最高温度及相应的地温梯度、热流和时间.实例分析表明岩石热导率等数据的准确性直接影响Ro解释的结果,但这种影响容易分析,而Hr的不确定性则导致多解性.更多还原

【Abstract】 Simplified models for three existing VR models(i.e.Middleton model,Waples model and Easy%R-o model) are obtained through the Monte Carlo Method.These simplified models show that the VR value is mainly determined by peak temperature(T-(max)),and is related to the temperature variation rate around the peak temperature(H-r).By comparing these simplified models,it is found that the Waples model and Middleton model are more sensitive to H-r than the Easy%R-o model,and,for the same value of VR,the Middleton model predicts the highest peak temperatures,Waples model the lowest and Easy%R-o model in between.These simplified models can be employed to interpret real VR data set to obtain the peak temperature that a stratum has experienced since deposition,and the thermal gradient,heat flow and time when the stratum experienced this peak temperature.Interpretation of VR data from the Inigok 1 well in the North Slope in Alaska indicates that poorly constrained data,such as thermal conductivity,may lead to errors.But these errors can be analyzed and quantified.However,the uncertainties of H-r may lead to non-uniqueness in the interpretation.更多还原