Diagenesis and Fluid Flow Variability of Structural Heterogeneity Units in Tight Sandstone Carrier Beds of Dibei, Eastern Kuqa Depression

Figure 7

Photomicrographs of representative hydrocarbons under UV showing that the dark-brown pyrobitumen (DB) primarily in intragranular pores is surrounded by orange migrabitumen (OB) (a), which usually exists mainly in intergranular pores (b), secondly in intragranular pores (c), and slightly in healed microfractures (d), but the microfractures with orange inclusions (OI) are cut by ones with white-blue inclusions (OWI) (d).

(a)

(b)

(c)

(d)