Acid-base alternation diagenesis and its influence on shale reservoirs in the Permian Lucaogou Formation, Jimusar Sag, Junggar Basin, NW China

WANG Jian,ZHOU Lu,LIU Jin,ZHANG Xinji,ZHANG Fan,ZHANG Baozhen

Fig. 3. Authigenic minerals and pore characteristics of the Lucaogou Formation rocks. (a) Well Ji174, 3114.86 m, residual intergranular pore, cast thin section; (b) Well Ji 174, 3134.79 m, dolomite intercrystalline pore, cast thin section; (c) Well Ji 174, 3182.43 m, arene solution pores, cast thin section; (d) Well Ji 10025, 3560.29 m, residual intergranular and intragranular dissolution pores, cast thin section; (e) Well Ji 302, 2868.01-2868.35 m, calcite veins and lenticular bodies visible, core image; (f) Well Ji 30, 4144.30 m, fine crystalline ankerite, dyed blue; (g) Well Ji 174, 3204.10 m, growth sequence of calcite-dolomite-iron bearing dolomite, backscattered electron image; (h) Well Ji 174, 3202.30 m, analcite, cross-polarized light; (i) Well Ji 305, 3542.40 m, oil filled between grains giving off white fluorescence, fluorescence thin section.