Tectonic stress field research on the Ordovician reservoirs in the Tahe Oilfield
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摘要: 油气储层构造应力场的分布特征，对油气运移、注采井网布置、储层改造等具有重要意义。为此，文章从塔河油田AD13井区的地质构造演化入手，基于油田测井资料，结合弹性力学及有限元理论，建立研究区地应力弹性力学计算模型，利用有限元软件对研究区储层地应力进行模拟研究，并将模拟结果与现场地应力实测值进行对比分析。结果表明，研究区最大水平主应力为102~130 MPa，最小水平主应力为87~110 MPa，均为压应力；研究区东部及南部最大水平主应力方向为北东向，西北部最大水平主应力方向为北东东向，西南部最大水平主应力方向为南东向，地应力大小及方向均与实际结果相符。研究结果可为研究区油气勘探开发工程提供科学依据。Abstract: The distribution characteristics of tectonic stress field in carbonate reservoir are of great significance to the study on oil and gas migration law, reasonable arrangement of injection-production pattern, reservoir transformation, etc. In this paper, starting with the geological tectonic evolution of the Well Block AD13 in the Tahe Oilfield, based on the well logging data, combined with elasticity and finite element theory, the elastic mechanics computational model of crustal stress in the research area is established and the reservoir crustal stress in the research area is simulated by using the finite element software, then the calculated results are compared with the measured values of crustal stress. The results indicate that the maximum horizontal principal stress is 102~130 MPa, the minimum horizontal principal stress is 87~110 MPa, all expressing as compressive stress. The direction of maximum horizontal principal stress in the east and south, northwest, and southwest of the research area are NE, NEE and SE, respectively. The magnitude and direction of crustal stress are consistent with the actual results. The research results can provide a scientific basis for oil and gas exploration and development engineering in the research area.
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Key words:
- the Tahe Oilfield /
- carbonate reservoirs /
- crustal stress /
- geologic model /
- numerical simulation
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图 1 AD13井区中—下奥陶统顶面构造图
Figure 1. The top structural distribution map of the Well Block AD13 in middle-bottom Ordovician
图 2 AD13井区奥陶系地层压力变化曲线图
Figure 2. The variation curves of the Ordovician formation pressure in the Well Block AD13
图 3 AD13井区模型有限单元网格图
Figure 3. The finite element mesh graph of the Well Block AD13 model
图 4 AD13井区最大水平主应力图
Figure 4. The maximum horizontal stress pattern of the Well Block AD13
图 5 AD13井区最小水平主应力图
Figure 5. The minimum horizontal stress pattern of the Well Block AD13
图 6 AD13井区地应力方向图
Figure 6. The crustal stress direction pattern of the Well Block AD13
表 1 研究区AD13井区动态、静态力学参数值
Table 1. The values of dynamic and static mechanical parameters of the sample rocks
井号 深度/m 弹性模量/GPa 泊松比 静态 动态 静态 动态 TK1201 6509.42 50.01 40.89 0.291 0.293 TK1215 6240.00 67.44 57.16 0.266 0.264 TK1225 6500.00 66.63 56.40 0.232 0.226 TK1271 6400.00 59.13 49.40 0.274 0.274 AD23 6264.71 66.63 56.40 0.263 0.261 TK1213 6260.00 67.18 56.91 0.295 0.298 TK1204 5976.48 69.25 58.85 0.251 0.247 TK1240 5650.00 86.95 75.37 0.262 0.260 TK1217 6000.00 75.57 64.75 0.246 0.242 
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表 2 塔河油田AD13井区奥陶系单井垂向压力数据表
Table 2. The single well vertical pressure data of the Well Block AD13 in the Tahe Oilfield
井号 测点深度/
m计算垂向压力/
MPa压力系数 AD23 6265 68.88 1.122 TK1213 6260 68.00 1.108 TK1204 5976 65.69 1.122 TK1240 5650 61.31 1.107 TK1217 6000 64.24 1.093 TK1245 5960 63.71 1.091 TK1275 5980 66.39 1.133
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表 3 AD13井区特定井点目的层位水平向地应力值
Table 3. The horizontal ground stress values of the target layer at specific point in the Well Block AD13
井号 水平最大主应力 水平最小主应力 AD23 113.776 99.973 TK1240 128.256 116.115 TK1217 119.587 104.640 TK1213 121.113 106.482 TK1245 137.187 110.390 TK1275 116.370 105.703
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表 4 模型岩石物理力学参数表
Table 4. Physical mechanics parameter table of the rock model
区域 弹性模量/MPa 泊松比 密度/(kg/m3) 断裂带 36000 0.221 2000 过渡区 48000 0.231 2300 外围区 6000 0.238 2500
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表 5 反演目标约束条件
Table 5. The constraint condition of the inversion target
井号 σx/MPa σy/MPa AD23 113.776 99.973 TK1240 128.256 116.115 TK1217 119.587 104.640 TK1213 121.113 106.482 TK1245 137.187 110.390 TK1275 116.370 105.703
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表 6 AD13井区地应力模拟值与实测值对比表
Table 6. The comparison table of the simulated values and the actual values of the ground stress of the Well Block AD13
井号 最大水平主应力/MPa 最小水平主应力/MPa 实测值 模拟值 误差/% 实测值 模拟值 误差/% AD23 113.776 107.354 5.64 99.973 89.047 10.93 TK1240 128.256 119.173 7.08 116.115 104.469 10.03 TK1217 119.587 107.619 10.01 104.640 98.301 6.06 TK1213 121.113 107.878 10.93 106.482 101.934 4.27 TK1245 137.187 126.461 7.82 110.390 97.101 12.04 TK1275 116.370 109.039 6.30 105.703 97.299 7.95
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