Reservoir Characteristics and Gas Content of Black Shale of Wufeng-Longmaxi Formation in Qianjiang Area, Southeast Chongqing, China

Figure 7

Photos of the FIB-SEM. (a) Well ZY1, 2617.82 m, honeycomb-like organic matter pores are densely developed, with good connectivity. The pores are round oval, and the pore diameter is 30-250 nm. (b) Well ZY1, 2618.18 m, organic matter pores are extremely developed, the pore diameter is mostly hundreds of nanometers, the pore roundness is high, and there are signs of dissolution at the edge. (c) Well ZY1, 2618.18 m, mold ball-shaped intergranular pore, with pore diameter of 10-200 nm. (d) Well ZY1, 2622.01 m, intragranular dissolution holes, clay minerals associated with authigenic quartz particles are corroded. (e) Well ZY1, 2622.01 m, intergranular pore. (f) Well ZY1, 2612.25 m, corrosion hole in clay mineral particles. (g) Well ZY1, 2624.92 m, corrosion hole between quartz particles and clay mineral particles, with large pore diameter, greater than 200 nm. (h, i) Well ZY1, 2616.33 m, authigenic quartz particles are filled with clay minerals and organic matter. After magnification, micropores filled with organic matter are developed. (j) Well ZY1, 2614.76 m, clay mineral intergranular pores (fractures) and organic matter pores are developed, and corrosion traces can be seen at the edge of authigenic quartz particles. (k) Well ZY1, 2613.00 m, massive organic matter pores are underdeveloped, and it can be seen that the contact contraction joint between clay minerals and kerogen is developed. (l) Well ZY1, 2618.70 m, microfractures run through the horizon, partially filled with organic matter, and several clay mineral contraction joints are developed.