0 引言
1 区域地质概况
2 储层基本特征
3 孔隙结构特征
3.1 成像特征
图4 湘鄂西页岩样品无机孔场发射—扫描电镜图片(a)HY1-S07,粒内溶孔、有机质—黏土矿物复合孔、有机孔;(b)YZ1-S24,黄铁矿与黏土矿物粒间孔、黏土矿物内层间孔;(c)EY1-S14,粒内溶孔、粒间孔;(d)LY1-S10,粒内孔;(e)HY1-S04,粒内孔(粒内解理),粒间孔;(f)EY1-S06,粒内孔(粒内解理),粒间孔;(g)EY1-S14,黄铁矿晶间孔;(h)LY1-S20,粒间孔;(i)YZ1-S3O,粒间孔 Fig.4 Field emission scanning electron microscope images of the shale inorganic pores in western Hubei and Hunan areas |
图5 湘鄂西页岩样品有机质与有机孔场发射—扫描电镜图片(a)HY1-S04,有机质分布;(b)HY1-S04,有机质与少量有机孔;(c)HY1-S07,有机质—黏土矿物复合孔、粒内孔;(d)LY1-S17,有机孔、粒间孔;(e)HY1-S04,有机孔;(f)HY1-S07,有机质—黏土矿物复合孔、有机孔;(g)LY1-S20,有机孔、粒间孔;(h)YZ1-S06,有机孔;(i)EY1-S06,有机孔、粒间孔、粒内孔 Fig.5 Field emission scanning electron microscope images of the organic matter and organic pores in shale samples in western Hubei and Hunan areas |
3.1.1 无机孔
3.1.2 有机孔
3.1.3 裂缝
3.2 低温氮气吸附特征
3.3 低温二氧化碳吸附特征
表1 湘鄂西页岩样品孔隙结构参数测定结果Table 1 Results of pore structure of shale samples in western Hubei and Hunan areas |
样品名 | N2吸附 | CO2吸附 | N2 & CO2吸附 | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
BET表面积 /(m2/g) | BJH孔直径/nm | BJH孔体积/(cm3/100 g) | 最大吸附量 /(cm3/g) | 微孔表面积 /(m2/g) | 微孔体积/ (cm3/100 g) | 最大吸附量 /(cm3/g) | 微孔体积 /% | 中孔体积 /% | 大孔体积 /% | 总孔体积/(cm3/100 g) | |
YZ1-S30 | 18.19 | 11.62 | 4.30 | 28.70 | 22.93 | 0.179 | 2.82 | 19.16 | 52.68 | 28.16 | 2.40 |
YZ1-S24 | 12.62 | 10.70 | 2.33 | 16.23 | 22.66 | 0.146 | 2.61 | 30.89 | 36.91 | 32.20 | 1.29 |
YZ1-S18 | 17.74 | 10.17 | 3.24 | 22.46 | 24.91 | 0.220 | 3.06 | 35.64 | 34.47 | 29.89 | 1.56 |
YZ1-S12 | 10.60 | 11.38 | 1.53 | 11.56 | 22.17 | 0.156 | 2.67 | 34.13 | 33.80 | 32.08 | 1.33 |
YZ1-S06 | 11.05 | 8.84 | 1.73 | 12.14 | 21.65 | 0.147 | 2.59 | 45.97 | 38.83 | 15.20 | 0.78 |
EY1-S14 | 12.50 | 9.78 | 2.18 | 15.17 | 23.84 | 0.122 | 2.59 | 33.00 | 50.05 | 16.96 | 1.16 |
EY1-S10 | 15.64 | 10.81 | 2.79 | 19.68 | 23.89 | 0.154 | 2.78 | 34.30 | 37.61 | 28.09 | 1.40 |
EY1-S06 | 10.48 | 10.51 | 1.94 | 13.49 | 26.20 | 0.083 | 2.81 | 29.89 | 47.19 | 22.92 | 0.95 |
EY1-S02 | 24.55 | 8.38 | 3.87 | 26.80 | 29.38 | 0.229 | 3.59 | 32.01 | 54.00 | 13.99 | 2.25 |
LY1-S25 | 12.82 | 11.54 | 2.16 | 15.64 | 27.96 | 0.154 | 3.21 | 28.87 | 36.38 | 34.75 | 1.67 |
LY1-S20 | 21.57 | 13.79 | 6.18 | 40.89 | 29.46 | 0.297 | 3.67 | 14.38 | 46.38 | 39.24 | 4.01 |
LY1-S17 | 11.48 | 10.78 | 2.26 | 15.55 | 23.44 | 0.166 | 2.84 | 31.88 | 40.18 | 27.94 | 1.15 |
LY1-S15 | 9.99 | 10.68 | 1.76 | 12.42 | 25.08 | 0.147 | 2.84 | 29.52 | 36.47 | 34.01 | 1.18 |
LY1-S10 | 12.34 | 8.21 | 2.13 | 14.25 | 37.41 | 0.363 | 4.62 | 47.69 | 39.60 | 12.71 | 1.12 |
HY1-S07 | 8.04 | 11.16 | 2.24 | 14.42 | 21.91 | 0.070 | 2.40 | 13.16 | 51.62 | 35.21 | 1.02 |
HY1-S04 | 10.68 | 8.48 | 1.85 | 12.49 | 25.55 | 0.141 | 2.96 | 31.17 | 49.71 | 19.12 | 1.03 |