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四川盆地东南缘有机质演化异常与古地温场特征

Keywords: 四川盆地东南缘,镜质体反射率,最大埋藏温度,地温梯度,大地热流值

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Abstract:

?以四川盆地东南缘武隆地区为例,系统采集下古生界—中生界层系样品并进行镜质体反射率测试,在区域构造沉积演化史分析的基础上,对镜质体反射率异常带进行划分与成因分析,分别利用镜质体反射率梯度法及最大埋藏温度法恢复各层系地质历史过程中地温梯度及最大埋藏温度。四川盆地东南缘下古生界—中生界存在4个镜质体反射率异常带,从上至下分别为上三叠统须家河组底部异常高值带、中二叠统栖霞组顶部—上二叠统龙潭组异常高值带、五峰组—龙马溪组底部页岩段异常高值带及其以下层系异常低值带,形成机制分别为油气运移带来的热流体活动、晚海西期峨眉玄武岩喷发、热液流体屏蔽层底部增温及地质流体高压封存箱。利用最大埋藏温度法恢复的古地温具有更高的可信度,恢复结果显示:受地质流体封存箱控制,下古生界地温梯度变化较大,寒武系地温梯度总体较低,志留系平均地温梯度可达41.47℃/km,上古生界—中生界古地温梯度为25.10~28.01℃/km,平均为26.18℃/km,大地热流背景值为66.78mw/m2。

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