The Field Stress between Late Jurassic and Early Cretaceous in the Eastern Ordos Basin
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摘要: 鄂尔多斯盆地是近年研究的热点区域.以鄂尔多斯盆地东部上古生界在燕山运动主幕期间 (晚侏罗世-早白垩世) 的应力场量化研究为目标，以期为应力场数值模拟及储层裂缝预测提供边界条件.通过盆地边界同构造期构造形迹应力反演和地层剥蚀量恢复结果探讨了晚侏罗世-早白垩世三轴应力状态及水平最大主应力方向；基于泥岩压实曲线及Newberry力学模型计算了附加构造应力及垂直地应力，进而获得了研究区上古生界在晚侏罗世-早白垩世的三轴主应力大小及差应力值.研究结果显示，研究区在燕山运动主幕期间最大主应力近水平，方向为SEE98°，中间主应力近竖直，最小主应力为NWW方向；上古生界储层 (平均恢复埋深为4 600 m) 在燕山运动主幕的三轴主应力大小分别为93.2~101.3 MPa、65.8~67.2 MPa、53.1~53.6 MPa，差应力为40.1~48.0 MPa.研究结果为区域构造应力场数值模拟、储层裂缝预测及裂缝型油气藏有利区优选等油气勘探工作提供了必要的基础.Abstract: The East Ordos basin is the hotpoint in recent years. In order to supply boundary conditions for field stress numerical simulation and fractures prediction in the eastern Ordos basin, this paper focus on the study of the specific parameters of the field stress between Late Jurassic and Early Cretaceous of Upper Paleozoic in eastern Ordos basin. Based on the retrieving of the syntectonicstructural deformation, calculatingof denudation thickness and the analyzing of the mudstone compaction curve, this paper got the triaxial stress state, the maximum horizontal principal stress direction, and the additive tectonic stress, the vertical earth stress, in-situ stress and differential stress. The results show that, the maximum and minimum principal stress were nearly horizontalwith the direction of the former point to SEE98°. The intermediate principal stress was nearly vertical. The triaxial stresses and the differential stress, which were get from Upper Paleozoic, located in 93.2 to 101.3 MPa, 65.8 to 67.2 MPa, 53.1 to 53.6 MPa and 40.1 to 48.0 MPa respectively. Those results providesignificant basis for field stress numerical simulation, fractures prediction as well as the optimization of favorable exploration zones in the fracturedreservoir.
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Key words:
- Ordos basin /
- Late Jurassic-Early Cretaceous /
- field stress /
- fracture /
- geodynamics /
- tectonics
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图 1 华北板块区域构造
根据张抗 (1989)、张岳桥等 (2006)、Hou et al.(2006)修改
Fig. 1. The main structural units of the North China craton
图 2 鄂尔多斯盆地东缘构造特征及力学机制
a.盆地东缘构造简图；b.擦痕滑动矢量反演结果；c.纵弯褶皱产状统计结果；1.前寒武地层；2.寒武系-奥陶系；3.石炭系；4.石炭系-二叠系；5.二叠系山西组；6.二叠系石盒子组；7.二叠系石千峰组；8.岩体；9.断层；10.背斜；11.向斜；12.野外观测点；13.擦痕滑动矢量；14.水平最大主应力方向；15.井位；据张抗 (1989)、张泓 (1996)、廖昌珍等 (2007)修改
Fig. 2. Geological sketch of structure and mechanical mechanism of the eastern Ordos basin
图 3 研究区晚三叠世-晚侏罗世地层剥蚀厚度等值线
Fig. 3. The isoline graph of the denudation thickness between Late Triassic-Late Jurassic
图 4 研究区燕山期附加构造应力计算连井剖面
Fig. 4. Connectingwell section of the additive tectonic stress calculation in Yanshanian
表 1 研究区及周边燕山期应力计算结果
Table 1. Stress calculation results in Yanshanian in the studied and surrounding area
井名 Δh(m) ρ(g/cm3) Str(MPa) σv(MPa) σH(MPa) σh(MPa) Δσ(MPa) W133 925 2.4 2.26 66.2 101.3 53.3 48.0 W134 813 2.5 2.04 67.2 97.9 53.6 44.3 W196 794 2.4 1.93 65.8 93.2 53.1 40.1 大11* 75.4 注：1.W133，W134，W196，大11井位置在图 2中标注；2.垂向地应力计算时地层埋深取剥蚀厚度恢复后的平均深度4 600 m；3.上覆岩层密度取密度测井平均值；4.“*”表示未正式出版资料 (周新桂, 2003, 鄂北塔巴庙地区构造应力场、裂缝系统定量预测及天然气评价)；5.大11井水平主应力由声发射实验测定，地层 (二叠系山西组) 恢复埋深3 510 m. 
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