CONTROLLING OF STRUCTURAL STRESS FIELD TO THE FRACTURES IN XUANHAN-DAXIAN REGION, NORTHEASTERN SICHUAN BASIN, CHINA
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摘要: 川东北宣汉-达县地区晚白垩世受到南东方向的挤压作用，始新世晚期-渐新世早期受到北东方向的挤压作用，两期构造活动导致宣汉-达县地区下三叠统飞仙关组碳酸盐岩中形成构造裂缝，对油气藏开发产生较大的影响。在考虑岩层与岩层之间相互影响的基础上，结合共轭节理和机械双晶的分析结果，利用三维有限元分析技术，计算宣汉-达县地区飞仙关组古构造应力大小，获得了两期古构造应力场的分布特征。通过岩石破裂阈值的限定，对普光、毛坝区块构造裂缝（张裂缝和剪裂缝）的发育区域进行预测，依据综合破裂率对岩层破裂强度进行评价，为提高裂缝钻遇率，降低勘探开发风险提供了科学的地质依据。Abstract: Structural stress field is one of the main reasons on fracture formation. It is the key of prediction structural fracture that paleostructure stress field is microscopically quantitative calculated.So we can well understand the fracture distribution in underground strata based on careful analysis to geological structure and numerical model coincides with the practice about the region of interest.It was influenced due to squeezing process from the SE direction during Late Crataceous and compressed from the NE direction in the period of Late Eocene-Early Oligocene in the Xuanhan-Daxian area of the northeast of Sichuan, China. The structural fracture development in Feixianguan formation in Lower Triassic series was effected by the two periods of structural action in Xuanhan-Daxian region. The fracture is an important geologic factor affecting the development of the oilfield. Through analysis of interaction in rock layers, calculation results on conjugate joints and mechanical twinning and using three dimensional finite element analysis method, we have obtained paleostructure stress in Feixianguan Formation of Xuanhan-Daxian region. We well know the distribution feature of paleostructure stress on the two periods. By threshold value-limited of the carbonatite burst, fracture area in Puguang and Maobawe blocks was predicted prediction. The integrated fracture rates give the basis to evaluate fracture strength. It provides the scientific geological basis for increasing the rate of drilling fractures and reducing the risk and cost of exploration and development.
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图 1 川东北宣汉—达县地区地质构造示意图
Figure 1. The schematic diagram on Xuanhan-Daxian region, Northeastern Sichuan Basin
图 2 大巴山构造带与江南-雪峰构造带活动时序[16]
Figure 2. Ages of evolutionary characteristics in Daba Mountain and Jiangnan-Xuefeng tectonic zones
图 3 川东北宣汉—达县地区构造层(NM-00-44)
Figure 3. Structural layeres in Xuanhan-Daxian region, Northeastern Sichuan Basin
图 4 宣汉—达县地区数值模拟区域
Figure 4. The numerical calculation domain for Xuanhan-Daxian region
图 5 宣汉—达县地区三维有限元分析物理模型
Figure 5. Three dimensional finite element analysis of physical models on Xuanhan-Daxian region
图 6 宣汉—达县地区最大剪应力三维分布图
Figure 6. The maximum shear stress three dimension distribution of Xuanhan-Daxian region
图 7 飞仙关组燕山晚期最大主应力分布图
Figure 7. The maximum principal stress distribution of Feixianguan formation in the Late Yanshan epoch
图 8 飞仙关组燕山晚期最大剪应力分布图
Figure 8. The maximum shear stress distribution of Feixianguan formation in the Late Yanshan epoch
图 9 飞仙关组燕山晚期最大主应变量分布图
Figure 9. The maximum principal strain distribution of Feixianguan formation in the Late Yanshan epoch
图 10 飞仙关组喜马拉雅期最大主应力分布图
Figure 10. The maximum principal stress distribution of Feixianguan formation in the Himalayan epoch
图 11 飞仙关组喜马拉雅期最大剪应力平面分布图
Figure 11. The maximum shear stress distribution of Feixianguan formation in the Himalayan epoch
图 12 飞仙关组喜马拉雅期最大主应变量平面分布图
Figure 12. The maximum principal strain distribution of Feixianguan formation in the Himalayan epoch
图 13 普光-毛坝区块飞仙关组燕山晚期裂缝发育区
Figure 13. The fracture distributions of Feixianguan Formation in the Puguang-Maoba block during Late Yanshan epoch
图 14 普光-毛坝区块飞仙关组破裂程度
Figure 14. Fracturing degrees of Feixianguan Formation in the Puguang-Maoba block
图 15 普光-毛坝区块飞仙关组喜马拉雅期裂缝发育区
Figure 15. The fracture distributions of Feixianguan Formation in the Puguang-Maoba block during Himalayan epoch
图 16 普光、毛坝区块岩心裂缝密度统计
Figure 16. Fracture density statistic to cores in the Puguang and Maoba blocks
表 1 研究区力学层划分
Table 1. Mechanical layers division about study area
表 2 宣汉—达县地区各个力学层力学物理参数
Table 2. Physical and mechanical Parameters of Mechanical layers on Xuanhan-Daxian region
表 3 宣汉—达县地区物理模型边界条件
Table 3. The choice boundary conditions of physical models on Xuanhan-Daxian region
表 4 利用共轭角计算燕山晚期、喜马拉雅期最大差应力值
Table 4. Maximum differential stresses calculated by using conjugate angle in the Late Yanshan and Himalayan
表 5 利用方解石机械双晶计算喜马拉雅期差应力
Table 5. The differential stresses using calcite mechanicaltwinning in the Himalayan epoch
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