沉积岩中黏土矿物产状与鉴别特征

Occurrence and Identification of Different Types ofClay Minerals in Sedimentary Rocks

沉积岩中粘土矿物类型、含量和产状是控制储层质量、开发决策的关键参数,影响孔隙结构、孔隙度、渗透率和含水饱和度等储层特征,也直接或间接地影响油气开发的全过程,使得黏土矿物成为石油勘探开发研究中的重要对象。基于上述问题,结合当前不同学者对黏土矿物的产状的分类方案,文章基于偏光显微镜与扫描电子显微镜等,对粘土矿物产状与类型开展系统鉴别,考虑成因、孔隙度、粘土类型、粘土赋存形式等为因素,分析沉积岩中不同类型的黏土矿物产状和鉴别特征,形成不同粘土矿物鉴别的规范性图版和识别标志,对沉积粘土矿物分类形成一个科学性、适用性、完整性的分类格架,对定量定性评价粘土具有实际价值,有利于应用和交流。

Clay minerals in sedimentary rock types,content and occurrence is the key to control the reservoir quality,the development decision-making parameters,its direct impact on the pore structure,porosity,permeability,water saturation and reservoir characteristics,also directly or indirectly affect the whole process of oil and gas development,makes the clay minerals important object in the study of oil exploration and development.According to the above problems,combining with the current occurrence of different scholars classification scheme,systematic identification of clay mineral occurrences and types was carry out based on the polarization microscope and scanning electron microscope(sem).Considering the factors such as the cause,porosity,clay type and clay occurrence form,the occurrence and identification characteristics of different types of clay minerals in sedimentary rocks were analyzed,standardized diagrams and identification marks for identifying different clay minerals were formed.A scientific,applicable and complete classification framework was formed for the classification of sedimentary clay minerals,which has practical value for quantitative and qualitative evaluation of clay.