(a)
(b)
(c)
Figure 2: Photo and microscope slice of core samples from Permian formation of well Yq3 in Yanqi survey: (a) actual core photo, (b) intragranular pore, and (c) intergranular pore. Small pores can be recognized on the side of core. In the microscope slices, pore spaces are colored and the grey part is the matrix.