鄂尔多斯盆地延长组长6储层成岩作用特征及孔隙度致密演化

Characteristic of diagenesis and pore dense evolution of Chang 6 reservoir of Triassic Yanchang Formation,Ordos Basin

依据鄂尔多斯盆地延长组长6油藏地质特征,结合铸体薄片、扫描电镜、物性等实验资料,深化姬塬油田和华庆油田长6储层成岩作用特征认识,按照成岩演化特征及地质综合效应建立与孔隙度对应的模拟方程。通过对比姬塬油田与华庆油田长6储层孔隙度演化路径,查明2个储层物性致密成因的差异性。研究结果表明:流体性质和温度是孔隙度演化的直接响应因子,埋藏深度、地层年代、不同类型胶结物含量是孔隙度演化的主要参数。

Based on the reservoir geological factor of Chang 6 sandstone reservoir in Ordos Basin, a detailed research on the feature of diagenesis was made with a series of experiments including casting thin slice, SEM, the techniques of physical properties and so on. And a simulation equation corresponding to porosity was established according to the feature of diagenetic evolution and the generalized geologic effect. By comparing the route of porosity evolution of Chang 6 sandstone reservoir in Jiyuan Oilfield and Huaqing Oilfield, the difference between the factors that resulted in two tight reservoirs was found out. The results show that the fluid property and temperature can influent the porosity evolution path directly, and the buried depth, chronostratigraphy, and the content of different cement types are the main parameters of the pore evolution.