Reservoir characteristics and genetic differences between the second and fourth members of Sinian Dengying Formation in northern Sichuan Basin and its surrounding areas

Yong LI,Xingzhi WANG,Mingyou FENG,Deming ZENG,Shengyang XIE,Rui FAN,Liangjun WANG,Tao ZENG,Xuefei YANG

Fig. 6. Dengying karst features in the region of interest. (a) Well MS1, Deng-4, 8 200.75 m, micritic dolostone, corroded gullies filled with breccia; (b) Well TX1, Deng-2, 2 535.02 m, micritic dolostone, corroded gullies filled with bluish grey mudstone; (c) Taoyuan section, Deng-2, dolomitic karst breccia with grape lace-shaped cement and inter-breccia cavities; (d) Lijiagou section, Deng-2, grape lace-shaped cement and crystalline dolomite cement, polarized light; (e) Lijiagou section, Deng-2, grape lace-shaped cement with weak luminescence, dark brown, crystalline dolomite with strong luminescence, shiny red cathodoluminescence.