0 引言
1 元坝气藏概况
2 飞仙关组裂缝特性
3 飞仙关组灰岩特征
3.1 飞仙关组灰岩力学性质
图4 典型应力—应变曲线(a)及飞仙关组灰岩应力—应变曲线(b)Fig.4 Typical stress-strain curve (a) and stress-strain curve of Feixianguan Formation limestone (b) |
表1 四川盆地灰岩不同围压下抗压强度Table 1 Fracture strength of limestone in Sichuan Basin under different confining pressures |
样品 编号 | 围压/MPa | 抗压强度/MPa | 样品 编号 | 围压/MPa | 抗压强度/MPa |
---|---|---|---|---|---|
1-1 | 20 | 301.4 | 3-3 | 15 | 171.437 |
1-2 | 40 | 295.9 | 3-4 | 20 | 248.413 |
1-3 | 60 | 387.8 | 3-5 | 40 | 276.392 |
1-4 | 80 | 391.3 | 3-6 | 60 | 263.669 |
1-5 | 100 | 348.2 | 4-1 | 5 | 191.621 |
1-6 | 120 | 424.2 | 4-2 | 10 | 210.306 |
2-1 | 5 | 316.96 | 4-3 | 15 | 200.279 |
2-2 | 10 | 256.399 | 4-4 | 20 | 195.227 |
2-3 | 15 | 272.393 | 4-5 | 40 | 194.723 |
2-4 | 20 | 285.238 | 4-6 | 60 | 216.111 |
2-5 | 25 | 315.602 | 5-1 | 10 | 194.596 |
2-6 | 30 | 292.355 | 5-2 | 15 | 170.816 |
2-7 | 35 | 337.976 | 5-3 | 30 | 199.444 |
2-8 | 40 | 352.12 | 6-1 | 22.5 | 245.878 |
2-9 | 45 | 321.307 | 6-2 | 22.5 | 247.388 |
2-10 | 50 | 335.963 | 6-3 | 45 | 267.149 |
2-11 | 55 | 340.903 | 7-1 | 22.5 | 91.838 |
2-12 | 60 | 322.407 | 7-2 | 22.5 | 253.109 |
3-1 | 5 | 259.912 | 7-3 | 45 | 146.772 |
3-2 | 10 | 229.813 |
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3.2 飞仙关组灰岩应力场特征
表2 岩石声发射信号记忆构造应力期次和相对大小Table 2 The paleo-stress phase and magnitude by acoustic emission experiment |
样品号 | 层位 | 各期最大主应力有效值/MPa | 期次 | 来源 |
---|---|---|---|---|
1 | 千佛崖组 | ①50.86;②64.52;③77.19;④92.7 | 4 | 本文 |
2 | 自流井组 | ①64.5;②72.8;③87.8;④92.7;⑤107.3 | 5 | 张元春[28] |
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