牛蹄塘组页岩矿物的成因类型及其地质指示意义

以场发射扫描电镜为主要研究手段，在微米级-纳米级尺度上观测南方下古生界牛蹄塘组（包括相当层位）页岩的主要组成矿物。通过揭示矿物质与有机质的生长发育形貌特征，从而获得判断矿物成因的直观依据。研究结果表明，牛蹄塘组页岩矿物的成因类型有陆源碎屑成因、自生成因（包括蚀变成因、生物成因等）、后生成因、热液成因、表生成因等，其中以陆源碎屑和自生成因为主。不同成因的矿物具有不同的地质指示意义，对页岩储层物性也有不同的影响。生物成因石英（包括硅质）与有机质的交互共生关系指示页岩气勘探的甜点层位。 

The genetic type and its geological indication significance of shale minerals in Niutitang Formation

With the field emission scanning electron microscopy(SEM), the mineral components of shales in the Lower Palaeozoic Niutitang Formation(including the equivalent stratum)were observed at the micron scale-nanoscale. By revealing the characteristics of the growth and development of minerals and organic matter, the intuitive basis for judging the origin of minerals is obtained. The results show that the genetic types of shale minerals in Niutitang Formation are terrigenous detrital, authigenic(including alteration and biogenic, etc.), epigenetic, hydrothermal, supergene, and so on, and detrital and authigenic account for the main part. Different genetic minerals have different geological indication significance and have different effects on shale reservoir property. The intergrowth between biogenic quartz(including silica)and organic matter indicates the favorable layer of shale gas exploration.