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

Table 3 XRD analysis results of clay minerals in the Lucaogou Formation reservoirs.

Well Depth/m Montmorillonite/% Illite/mosnt- morillonite/% Illite/ % Kaolinite/ % Chlorite/ % Chlorite/mont- morillonite/% Ratio of the illite/ montmorillonite/% Ratio of chlorite/ montmorillonite/% Ji 174 3128.10 44 56 70 Ji 174 3141.04 3 11 86 40 Ji 174 3197.79 100 100 Ji 174 3206.44 94 6 100 Ji 174 3267.19 69 31 90 30 Ji 174 3296.61 100 95 Ji 174 3314.46 95 5 80 Ji 174 3378.36 6 18 76 20 Ji 174 3392.77 28 16 56 30 Ji 251 3601.06 85 15 20 Ji 251 3619.61 11 54 28 7 20 30 Ji 251 3629.18 12 88 30 Ji 251 3631.99 47 29 24 55 Ji 251 3632.35 2 35 34 29 20 40 Ji 251 3633.07 37 48 15 40 Ji 251 3744.72 100 60 Ji 251 3770.33 100 60 Ji 251 3878.49 83 8 9 95 Ji 303 2592.00 52 29 6 13 75 Ji 303 2592.77 63 19 7 11 65 Ji 303 2600.32 64 20 3 13 65 Ji 305 3576.78 79 13 8 90 Ji 34 3684.59 10 90 Ji 34 3781.22 60 27 4 9 20 Ji 34 3811.43 11 61 6 22 20 Ji 34 3811.70 26 40 7 27 40 Ji 34 3812.34 85 11 2 2 85 Ji 34 3813.00 31 53 7 9 80 Ji 34 3815.65 91 1 2 6 40 Ji 38 2785.22 53 15 32 90 Ji 38 2809.43 60 14 26 45 Ji 43 2924.27 10 90 30 Ji 43 2948.26 97 3 90 Ji 43 2961.93 3 6 11 80 20 40