The Distribution and Origin of Carbonate Cements in Deep-Buried Sandstones in the Central Junggar Basin, Northwest China

Figure 10

Photomicrographs of pore types by electron microprobe analysis of sandstones in central Junggar Basin. (a) and (a′) Intergranular secondary pore develops, and measuring point A shows that the remnant is K-feldspar and the measuring point B is calcite. The photomicrograph is a red-epoxy-impregnated thin sections of conventional core samples with magnification of 10 (Sha 1 well at 3656.6 m with Jurassic) and photo (a) by plane-polarized light and photo (a′) by cross polarization; (b) and (b′) intergranular secondary pore develops, and measuring point C shows that the remnant is albite and measuring point D is K-feldspar. The photomicrograph is a red-epoxy-impregnated thin sections of conventional core samples with magnification of 10 (Zhuang 1 well at 4375.23 m with Jurassic), and photo (b) by plane-polarized light and photo (b′) by cross polarization; (c) and (c′) intergranular secondary pore develops, measuring point E shows that the remnant is albite. Measuring point F is calcite and measuring point G is siderite, and the photomicrograph is a red-epoxy-impregnated thin sections of conventional core samples with magnification of 10 (Sha 2 well at 3439 m with Jurassic) and photo (c) by plane-polarized light and photo (c′) by cross-polarized light; (d) and (d′) intergranular secondary pore develops, and measuring point H shows that the remnant is calcite, measuring point I is K-feldspar, and measuring point J is albite. The photomicrograph is a red-epoxy-impregnated thin sections of conventional core samples with magnification of 10 (Y1 well at 5877 m with Jurassic) and photo (d) by plane-polarized light and photo (d′) by cross-polarized light.