Determination of Formation Time of Calcareous Cements in Marine Sandstone and Their Influence on Hydrocarbon Accumulation: A Case Study of the Carboniferous Donghe Sandstone in the Hadexun Oilfield, Tarim Basin

Figure 5

Typical cathodoluminescence images of calcareous cements.

(a) Calcite-cemented sandstones, 5098.52 m, polarizing microscope with cross-polarized light, Well HD4

(b) Calcite-cemented sandstones, 5098.52 m, cathodoluminescence, Well HD4

(c) Calcite-cemented sandstones, 5529.47 m, polarizing microscope with cross-polarized light, Well HD17

(d) Calcite-cemented sandstones, 5529.47 m, cathodoluminescence, Well HD17