阜东斜坡区齐古组自生绿泥石的赋存状态与影响因素

在野外剖面及岩心观察基础上，利用薄片鉴定、扫描电镜以及电子探针等多重手段，对阜东斜坡区齐古组砂岩储层中自生绿泥石的赋存特征和形成机制进行了详细的分析，为油气藏寻找以及开发方案的调整提供方向。结果表明，研究区齐古组储层砂岩中自生绿泥石在镜下呈现3种赋存状态：衬垫式、薄膜式和充填式，以衬垫式为主，相对应的储层物性较好；自生绿泥石为富铁绿泥石，凝灰质岩屑以及长石类矿物的溶蚀、黏土矿物之间的转化以及河流溶解的Fe所形成的絮状沉淀都为自生绿泥石的形成提供了重要的物质基础；粒径大的砂岩储层中流体流动性相对较好，有利于形成绿泥石大量发育的碱性环境；齐古组绿泥石的赋存状态一致，其含量不同对储层储集性能及敏感性有一定影响。

The occurrence states and influencing factors of authigenic chlorite in the Qigu Formation of the Fudong slope area

On the basis of field profile and core observation, multiple methods such as thin section identification, scanning electron microscopy, and electron probe were used to conduct a detailed analysis of the occurrence characteristics and formation mechanism of authigenic chlorite in sandstone reservoir of the Qigu Formation in the Fudong slope area, providing the adjustment direction for the search for oil and gas reservoirs and development plans. The results indicate that the authigenic chlorite in the sandstone of the Qigu Formation reservoir in the study area exhibits three occurrence states under the microscope: liner-type, membrane-type, and filling-type, with liner-type being the main occurrence, and the corresponding reservoir properties are good; Authigenic chlorite is iron-rich chlorite, and the dissolution of tuffaceous debris and feldspar minerals, the transformation between clay minerals, and the flocculent precipitation formed by Fe dissolved in rivers are the important material basis for the formation of authigenic chlorite; Sandstones with large grain size and well sorting have high content of authigenic chlorites, which is helpful for forming and protecting of authigenic chlorite; Strong fluid dynamic is also an important controlling factor of authigenic chlorite formation; The occurrence states of chlorite in the Qigu Formation are similar, and different content of authigenic chlorite have a certain affection on the reservoir property and sensitivity.