木里坳陷上三叠统—中侏罗统粘土矿物及储层成岩作用特征

The characteristics of Triassic-Jurassic clay mineral and reservoir diagenesis in the Muli depression

为了对木里坳陷上三叠统—中侏罗统(T_3-J_2)成岩阶段分析以及储集层物性的评价价,利用X线衍射(XRD)技术对以该层段粘土矿物特征进行了研究。研究得出:(1)粘土矿物组合变化趋势表明,成岩作用是该层段粘土矿物组合控制的主要因素;(2)不同岩层中粘土矿物的组合不同,参照煤地层碎屑岩成岩阶段标准,将本段碎屑岩层划分为3个阶段;(3)粘土矿物的存在对中侏罗统地层和尕勒得寺组砂岩储集层的储集物性有影响。木里坳陷中侏罗统具有较好的生烃岩层,应进行进一步勘探研究。

X-ray diffraction（ XRD） technology was applied to analyze Triassic-Jurassic reservoir diagenesis and physical property of clay minerals at Muli depression.The main results are as follows：（ 1） According to the clay mineral association variation trend,diagenesis is the main factors;（ 2） Different layers of clay mineral association follow the standards of coal formation clastic diagenetic stage,and this period of clastic rock strata are divided into three phases;（ 3） The presence of clay minerals in middle Jurassic strata and Karamanid group（ T3g） sandstone reservoir exert effects on reservoir physical properties.Having good hydrocarbon generation Muli depression Jurassic,further exploration and study should be done.