DISTRIBUTION OF SURROUNDING ROCK STRESS IN DEEP CARBONATE RESERVOIR KARST CAVE
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摘要: 以冀中凹陷任北奥陶系碳酸盐岩储层为例，基于油田测井资料及岩石力学实验确定了研究区岩石力学参数，对目标储层典型的长椭圆形孤立落水溶洞围岩应力进行了数值模拟，并根据第三强度理论研究了围岩破坏情况。研究结果表明，（1）溶洞在上覆岩层压力和侧向压力的共同作用下，长椭圆形溶洞围岩的应力集中效应带为9倍的半径范围；（2）长椭圆形溶洞围岩应力以压应力为主，主要集中分布在洞顶和洞底；（3）溶洞填充性对其围岩主应力差及破坏范围影响很大。当填充压力小于0.1 MPa时，溶洞围岩主应力差及破坏区域范围随填充压力的增大而增大；而当填充压力大于0.1 MPa时，溶洞围岩主应力差及破坏区域范围随填充压力的增大均呈减小的趋势。Abstract: The Ordovician carbonate oil pool in northern Renqiu of the Jizhong depression is taken as an example in this article. The rock mechanical parameters in the study area were calculated based on the log data of the oil field, and the typical isolated water long elliptic karst cave of the target reservoir was selected, with its surrounding rock stress and its damage zone calculated by numerical simulation and third strength theory. The results show that:1) Under the combined action of overburden pressure and lateral pressure, the stress concentration effect zone of the long elliptic karst cave surrounding rock is 9 times of the radius. 2) The surrounding rock stress of long elliptic karst cave is mainly compressive stress, mainly concentrating in the top and the bottom. 3) The filling property of karst cave has great influence on the principal stress difference and damage range of surrounding rock. For the long-elliptic karst cave, the principal stress difference and shear damage of the surrounding rock increase with the increase of filling pressure when the filling pressure is less than 0.1 MPa; while the principal stress difference and the shear damage range of the surrounding rock gradually decrease with the increase of filling pressure when the filling pressure is more than 0.1 MPa.
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Key words:
- carbonate rocks /
- karst cave /
- surrounding rock stress /
- numerical simulation
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图 1 长椭圆形溶洞几何模型及约束加载图
Figure 1. Schematic diagram of the geometric model and the constraint loading in the long ellipse karst cave
图 2 长椭圆形溶洞围岩最大主应力沿径向变化图
Figure 2. Diagram of the radial variation of maximum principal stress of the surrounding rock in long ellipse karst cave
图 3 长椭圆形溶洞围岩最小主应力沿径向变化图
Figure 3. Diagram of the radial variation of minimum principalstress of the surrounding rock in long ellipse karst cave
图 4 长椭圆形溶洞围岩主应力差分布图(负为压)
Figure 4. Distribution of principal stress difference of the surrounding rock in long ellipse karst cave (Pressure is negative)
图 5 长椭圆形溶洞围岩破坏区域分布图
Figure 5. Distribution of failure zone of the surroundingrock in long ellipse karst cave
图 6 长椭圆形溶洞应力随填充压力的变化曲线
Figure 6. Curves of the change of stress with the filling pressure in long ellipse karst cave
图 7 长椭圆形溶洞围岩在填充压力作用下的剪切破坏图
Figure 7. Shear failure of the surrounding rock in long ellipse karst cave under the filling pressure
表 1 任76井岩石力学特性
Table 1. Rock mechanics parameters of Ren 76 well
岩层深度/m 纵波时差μs/m 横波时差μs/m 动态弹性模量/104 MPa 动态泊松比 静态弹性模量/104 MPa 静态泊松比 抗压强度/MPa 剪切强度/MPa 抗张强度/MPa 内摩擦角/(°) 垂直应力/MPa 最大水平主应力/MPa 最小水平主应力/MPa 3119.7 212.27 411.73 5.7945 0.445 4.1365 0.2381 177.02 17.91 14.75 19.23 105.47 108.35 97.44 3126.7 219.49 418.41 6.1218 0.483 4.3687 0.2476 168.21 16.46 14.02 19.29 105.69 107.93 97.31 3130.5 204.98 409.76 5.9362 0.458 4.2370 0.2413 177.76 18.62 14.81 19.20 105.79 109.57 98.33 3166.0 222.8 420.34 6.0547 0.452 4.3211 0.2398 166.63 16.09 13.89 19.30 106.56 108.88 98.03 3171.6 214.63 412.31 6.1642 0.453 4.3988 0.2401 177.27 17.76 14.77 19.24 106.73 109.50 98.55 3180.6 221.32 419.26 6.1818 0.480 4.4113 0.2468 167.78 16.30 13.98 19.30 106.87 109.36 98.42 3185.5 223.88 421.57 6.3947 0.505 4.5623 0.2531 164.86 15.85 13.74 19.31 107.02 109.29 98.45 3193.4 215.45 412.4 6.0991 0.491 4.3526 0.2496 177.64 16.74 14.80 19.24 107.22 109.95 98.97 3204.4 223.29 423.37 6.1386 0.495 4.3806 0.2507 160.62 15.45 13.38 19.33 107.47 109.89 99.03 
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表 2 研究区岩石力学特性
Table 2. Rock mechanics parameters of the study area
岩石类型 静态弹性模量/104 MPa 静态泊松比 剪切强度/MPa 抗张强度/MPa 抗拉强度/MPa 内摩擦角/(°) 垂向应力/MPa 最大水平主应力/MPa 最小水平主应力/MPa 石灰岩 4.3521 0.2452 16.79 14.24 170.34 19.28 106.50 109.20 98.28
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