Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (3): 658-669.doi: 10.11743/ogg20220314
• Petroleum Geology • Previous Articles Next Articles
Guangyuan Sun1(), Zhelin Wang2,3, Peigang Liu3,4(), Zhiqiang Zhang3
Received:
2021-12-02
Revised:
2022-03-10
Online:
2022-06-01
Published:
2022-05-06
Contact:
Peigang Liu
E-mail:3130000936@zju.edu.cn;dongfangwy@upc.edu.cn
CLC Number:
Guangyuan Sun, Zhelin Wang, Peigang Liu, Zhiqiang Zhang. Dissolved micro-pores in alkali feldspar and their contribution to improved properties of tight sandstone reservoirs: A case study from Triassic Chang-63 sub-member, Huaqing area, Ordos Basin[J]. Oil & Gas Geology, 2022, 43(3): 658-669.
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Table 1
EDS statistics of alkali feldspar in Chang?63 tight sandstone reservoir, Huaqing area, Ordos Basin"
分类 | 测试编号 | 矿物类型 | 元素含量/% | ||||||
---|---|---|---|---|---|---|---|---|---|
K | Na | Ca | Al | Si | C | O | |||
波状条纹长石 | 1 | 钾长石 | 5.13 | 0.77 | 0 | 6.43 | 19.44 | 2.70 | 65.53 |
2 | 钾长石 | 4.82 | 1.04 | 0 | 6.24 | 19.89 | 4.29 | 63.72 | |
3 | 钾长石 | 5.22 | 0.70 | 0 | 6.06 | 19.44 | 2.79 | 65.79 | |
4 | 钾长石 | 7.01 | 0 | 0 | 5.51 | 18.40 | 2.64 | 66.44 | |
5 | 钾长石 | 5.14 | 0.75 | 0 | 6.21 | 19.33 | 3.84 | 64.73 | |
6 | 钾长石 | 4.76 | 0 | 0 | 6.17 | 17.32 | 11.29 | 60.46 | |
平均值 | 5.35 | 0.54 | 0 | 6.10 | 18.97 | 4.59 | 64.45 | ||
7 | 钠长石 | 0 | 5.96 | 0 | 5.85 | 19.48 | 2.38 | 66.33 | |
8 | 钠长石 | 0 | 6.28 | 0.58 | 6.48 | 17.85 | 3.05 | 65.76 | |
9 | 钠长石 | 0 | 5.73 | 0 | 6.00 | 18.76 | 3.63 | 65.88 | |
10 | 钠长石 | 0 | 6.17 | 0.65 | 6.82 | 18.66 | 3.14 | 64.56 | |
11 | 钠长石 | 0 | 5.65 | 0 | 5.60 | 16.98 | 12.63 | 59.14 | |
12 | 钠长石 | 0 | 6.27 | 0 | 6.00 | 18.63 | 6.06 | 63.04 | |
平均值 | 0 | 6.01 | 0.62 | 6.13 | 18.39 | 5.15 | 64.12 | ||
斑块状条纹长石 | 1 | 钾长石 | 4.99 | 0 | 0 | 6.27 | 20.42 | 3.60 | 64.72 |
2 | 钾长石 | 5.14 | 0.71 | 0 | 5.90 | 19.00 | 4.68 | 64.57 | |
3 | 钾长石 | 5.49 | 0.26 | 0 | 6.17 | 19.40 | 3.32 | 65.36 | |
4 | 钾长石 | 5.41 | 0.26 | 0 | 6.23 | 19.04 | 3.45 | 65.61 | |
5 | 钾长石 | 5.68 | 0.67 | 0 | 5.86 | 18.76 | 2.86 | 66.17 | |
6 | 钾长石 | 5.29 | 0.38 | 0 | 6.57 | 19.76 | 3.85 | 64.15 | |
平均值 | 5.33 | 0.38 | 0 | 6.17 | 19.40 | 3.63 | 65.10 | ||
7 | 钠长石 | 0 | 5.95 | 0.82 | 7.06 | 18.21 | 2.37 | 65.59 | |
8 | 钠长石 | 0 | 6.56 | 0 | 6.18 | 18.80 | 4.19 | 64.27 | |
9 | 钠长石 | 0 | 6.23 | 0.54 | 6.32 | 18.72 | 3.16 | 65.03 | |
10 | 钠长石 | 0 | 6.27 | 0 | 6.11 | 18.99 | 2.51 | 66.12 | |
11 | 钠长石 | 0 | 5.30 | 0 | 4.80 | 14.99 | 17.74 | 57.17 | |
12 | 钠长石 | 0 | 6.65 | 0 | 6.26 | 19.49 | 2.51 | 65.09 | |
平均值 | 0 | 6.16 | 0.68 | 6.12 | 18.20 | 5.41 | 63.88 |
Table 2
Secondary dissolution porosity of feldspar in the tight sandstone reservoir based on theoretical calculation[24-25]"
矿物类型 | 长石溶蚀过程反应式 | 反应前、后矿物体积差/cm3 | 参加反应矿物总体积/cm3 | 理论溶蚀孔隙度/% |
---|---|---|---|---|
钾长石 | 初期:1 mol钾长石→1/2 mol高岭石+2 mol石英 | -14.05 | 109.1 | 12.88 |
后期:1 mol钾长石→1/3 mol伊利石+2 mol石英 | -16.80 | 109.1 | 15.40 | |
钠长石 | 初期:1 mol钠长石→1/2 mol高岭石+2 mol石英 | -5.15 | 100.2 | 5.14 |
后期:1 mol钠长石→1/3 mol伊利石+2 mol石英 | -7.93 | 100.2 | 7.91 | |
钙长石 | 初期:1 mol钙长石→1 mol高岭石 | -1.40 | 100.7 | 1.39 |
后期:1 mol钙长石→2/3 mol伊利石 | -6.97 | 100.7 | 6.92 |
Table 3
Dissolved porosity contribution and dissolution intensity of feldspar in Chang?63 tight sandstone reservoir, Huaqing area, Ordos Basin"
样品编号 | 溶孔率/% | 总孔隙度/ % | 溶孔贡献率/% | 总溶孔贡献率/% | 溶蚀强度判定 | ||
---|---|---|---|---|---|---|---|
钾长石 | 钠长石 | 钾长石 | 钠长石 | ||||
2 | 0.70 | 0.33 | 10.90 | 6.43 | 3.03 | 9.45 | 弱溶蚀 |
4 | 0.60 | 0.28 | 5.95 | 10.14 | 4.78 | 14.92 | 弱溶蚀 |
7 | 1.16 | 0.55 | 8.84 | 13.16 | 6.20 | 19.37 | 中溶蚀 |
11 | 0.22 | 0.10 | 15.38 | 1.40 | 0.66 | 2.06 | 弱溶蚀 |
13 | 0.36 | 0.17 | 14.03 | 2.53 | 1.19 | 3.73 | 弱溶蚀 |
14 | 0.79 | 0.37 | 7.82 | 10.15 | 4.78 | 14.93 | 弱溶蚀 |
16 | 0.84 | 0.40 | 8.00 | 10.51 | 4.95 | 15.46 | 中溶蚀 |
17 | 0.48 | 0.23 | 7.49 | 6.47 | 3.05 | 9.52 | 弱溶蚀 |
18 | 1.63 | 0.77 | 6.83 | 23.93 | 11.28 | 35.20 | 强溶蚀 |
19 | 0.61 | 0.29 | 10.40 | 5.91 | 2.78 | 8.69 | 弱溶蚀 |
23 | 0.27 | 0.13 | 8.58 | 3.18 | 1.50 | 4.68 | 弱溶蚀 |
25 | 0.95 | 0.45 | 10.70 | 8.86 | 4.18 | 13.04 | 弱溶蚀 |
26 | 1.31 | 0.62 | 8.08 | 16.18 | 7.63 | 23.81 | 中溶蚀 |
27 | 1.53 | 0.72 | 10.74 | 14.28 | 6.73 | 21.01 | 中溶蚀 |
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