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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 600m)在燕山运动主幕的三轴主应力大小分别为93.2~101.3MPa、65.8~67.2MPa、53.1~53.6MPa,差应力为40.1~48.0MPa.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.
The Ordos Basin is a hot area in recent years, and aims to quantify the stress field in the Upper Paleozoic of the Ordos Basin during the main curtain of the Yanshan movement (Late Jurassic-Early Cretaceous) in order to simulate the stress field and reservoir fractures Prediction provides boundary conditions.The triaxial stress state and the maximum horizontal principal stress direction of Late Jurassic-Early Cretaceous are discussed based on the results of tectonic stress inversion and denudation restoration in the same tectonic period of the basin boundary.Based on the compaction curves of mudstone and Newberry Mechanical model to calculate the additional tectonic stress and vertical stress, and then get the Upper Paleozoic in the study area in the Late Jurassic - Early Cretaceous three axis principal stress size and stress values. The results show that the study area in Yanshan movement main The maximum principal stress during the curtain period is nearly horizontal, with the direction of SEE 98 °. The principal stress in the middle is nearly vertical and the minimum principal stress is in the NWW direction. The Upper Paleozoic reservoir (average recovery depth is 4 600 m) The stress is 93.2 ~ 101.3MPa, 65.8 ~ 67.2MPa, 53.1 ~ 53.6MPa and the difference stress is 40.1 ~ 48.0MPa.The results are numerical simulation of regional tectonic stress field and prediction of reservoir fractures Advantageously zone fracture type reservoir preferably provide petroleum exploration and other necessary infrastructure.