Observing Skills of Secondary and Backscatter SEM Method of Shale

1 Introduction There are two ways to prepare SEM samples of shale, one is fresh fracture secondary electron method, the other is Ion-Milled Backscatter Method. Secondary electron SEM is 3-D image, can provide the original morphology, fossil and mineral ID is easier： Backscatter SEM （Ar-ion milled） have very flat surface and is 2-D image, the grayscale is proportional to density, and visible pores have well-defined outlines.