Fluid interaction mechanism and diagenetic reformation of basement reservoirs in Beier Sag, Hailar Basin, China

LI Juan,WEI Pingsheng,SHI Lanting,CHEN Guangpo,PENG Wei,SUN Songling,ZHANG Bin,XIE Mingxian,HONG Liang

Fig. 5. Cathodoluminescence characteristics of fracture fillings in basement reservoir of Beier Sag. (a) Well B30, 2205.10 m, carbonation silty mudstone, with cryptocrystalline quartz of two stages filling in fractures; (b) Well B30, 2205.10 m, carbonation silty mudstone, early quartz emitting dark blue cathode light, and late quartz emitting blue cathode light; (c) Well B40, 2362.80 m, andesitic tuff, with calcite of two stages filling in fractures; (d) Well B40, 2362.80 m, andesitic tuff, with early calcite emitting dark yellow cathode light and late calcite emitting orange cathode light; (e) Well B16b2, 1870.80 m, andesitic tuff, with early calcite filling in fractures and dissolved later, crossed polarizer; (f) Well B30, 2205.10 m, carbonation silty mudstone, early cryptocrystalline-phanerocrystalline quartz filling in fractures emits blue cathode light, and late calcite filling in fractures emits yellow cathode light; (g) Well B28, 1923.55 m, carbonation silty mudstone, early calcite filling in fractures emits orange cathode light and late quartz filling in fractures emits blue cathode light; (h) Well B30, 2211.40 m, carbonation silty mudstone, epimetamorphic calcite emitting orange cathode light, and late quartz filling in fractures emits blue cathode light.