Seismic Characterization of Hypogenic Karst Systems Associated with Deep Hydrothermal Fluids in the Middle-Lower Ordovician Yingshan Formation of the Shunnan Area, Tarim Basin, NW China

Figure 3

Petrologic characteristics of the Yingshan Formation determined from well SN4. (a) Lithology of well SN4 from 6668.3 to 6673.5 m. (b) Centimeter-scale honeycomb residual pores, 6669.47 m. (c) Half-filling residual pores along the fractures, 6670.44 m. (d) Half-filling residual pores along the fracture and millimeter-scale honeycomb residual pores, 6670.57 m. (f) Quartz in vein, 6670.48 m. (e) Iceland spar (calcite), 6672.25 m. (g) Tabular anhydrite, 6672.98 m.

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