Stress field simulation and fracture development prediction of the Wufeng Formation-Longmaxi Formation in the Fushun-Yongchuan Block, Sichuan Basin
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摘要: 岩石中构造裂缝主要受控于地层所处的区域构造应力场，地应力对油气的运移、成藏和分布有着重要的作用。通过应用ANSYS有限元数值模拟方法对四川盆地富顺-永川区块的五峰组-龙马溪组进行应力场模拟及分析研究、应用构造曲率法中的三点法对该层段页岩进行张裂缝发育情况预测研究、综合模拟结果与曲率计算数据对目的区域目的层段进行裂缝发育强度综合预测研究，结果表明富顺-永川区块五峰组-龙马溪组应力高值沿背斜走向分布的规律明显，研究区的东部及西南部的背斜应力值较其他区域背斜高；曲率高值沿背斜走向分布的规律明显，研究区东部及西南部背斜曲率值较其他区域背斜高；在现今应力的作用下，研究区背斜处裂缝发育程度较高，向斜处裂缝发育程度较低，研究区东部及西南部背斜裂缝发育程度较其他区域高。Abstract: The tectonic fractures in rocks are mainly controlled by the regional tectonic stress field where the strata are located. Tectonic stress plays an important role in the migration, accumulation and distribution of oil and gas. The stress field of the Wufeng Formation-Longmaxi Formation in the Fushun-Yongchuan Block of the Sichuan Basin was simulated and analyzed by ANSYS finite element software; The three-point method in the method of structural curvature method was used to predict the development of cracks in the shale, and the comprehensive simulation results and curvature calculation data were used to predict the fracture intensity in the target area. The results proved that the distribution of the high stress value of the Wufeng Formation-Longmaxi Formation in the Fushun-Yongchuan Block is along the anticline, and the anticline stress values in the eastern and southwestern part of the study area are higher than those in other areas; the distribution of high curvature is along the anticline, and the curvature values of the anticline in the east and southwest of the study area are higher than those in other areas; the fracture in the anticline of the study area has a higher level of development, and it's lower in the syncline, at the same time it's higher in the anticline of the eastern and southwestern part of the study area than other areas under the current stress.
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Key words:
- curvature method /
- finite element /
- fracture prediction /
- Longmaxi Formation /
- Sichuan Basin
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图 2 富顺-永川区五峰组底面三维构造图
Figure 2. The 3-D structural picture of the bottom of the Wufeng Formation in the Fushun-Yongchuan Block
图 3 四川盆地古生界(部分)地层综合柱状图(刘文平等，2017)
Figure 3. Comprehensive histogram of the Paleozoic strata (partial) in the Sichuan Basin (Liu et al., 2017)
图 4 富顺-永川区块五峰组—龙马溪组力学参数分布
a—泊松比—深度关系图；b—杨氏模量—深度关系图
Figure 4. Distribution of rock's mechanical parameters in the Wufeng Formation—Longmaxi Formation, Fushun-Yongchuan Block
图 5 富顺-永川区块五峰组—龙马溪组模型所受应力值拟合图
a—垂向上覆岩层压力-深度关系；b—水平应力-深度关系
Figure 5. Stress value fitting of the Wufeng Formation—Longmaxi Formation model in the Fushun-Yongchuan Block
图 6 富顺-永川区块五峰组—龙马溪组模型载荷与约束示意图
Figure 6. Load and constraint of the Wufeng Formation—Longmaxi Formation in the Fushun-Yongchuan Block
图 7 富顺-永川区块五峰组—龙马溪组差应力分布图
Figure 7. Distribution of stress intensity in the Wufeng Formation—Longmaxi Formation, Fushun-Yongchuan Block
图 8 富顺-永川区块五峰组—龙马溪组最大主应力分布图
Figure 8. Distribution of maximum principal stress in the Wufeng Formation—Longmaxi Formation, Fushun-Yongchuan Block
图 9 富顺-永川区块五峰组—龙马溪组曲率分布-断层位置叠合图
Figure 9. Overlay of curvature distribution and fault position in the Wufeng Formation—Longmaxi Formation, Fushun-Yongchuan Block
图 10 富顺-永川区块五峰组—龙马溪组裂缝强度分布图
Figure 10. Distribution of crack strength in the Wufeng Formation—Longmaxi Formation, Fushun-Yongchuan Block
表 1 四川盆地燕山期主幕水平主应力大小计算表
Table 1. Computation chart of horizontal stress of Yenshanian main curtain in the Sichuan Basin
井号 深度/m σ1/MPa σ3/MPa σ/MPa A井 1585 62.4 35.3 71.69 1594 49.1 31.4 58.28 1599 56.3 36.2 66.93 B井 2451 61.5 47.5 77.70 2470 59.8 46.5 75.75 2490 64.4 49.6 81.28 C井 2940 73.8 42.5 85.16 2934 73.9 45.2 86.62 2980 74.8 45.2 87.39 2986 75.2 47.9 89.15 2991 75.2 44.4 87.32 2998 75.2 44.7 87.48 注：σ1—最大水平主应力；σ3—最小水平主应力；σ—燕山期主幕水平应力 
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