鄂尔多斯盆地东部晚侏罗世-早白垩世应力场

发布时间：2018-03-08 03:03

本文选题：鄂尔多斯盆地　切入点：晚侏罗世-早白垩世　出处：《地球科学》2017年04期 　论文类型：期刊论文

【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 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.
[Abstract]:The Ordos Basin is a hot research area in recent years. The quantitative study of the stress field of the Upper Paleozoic in the eastern part of the Ordos Basin during the main curtain of the Yanshanian movement (late Jurassic-early Cretaceous) is the objective. In order to provide boundary conditions for numerical simulation of stress field and prediction of reservoir fractures, the triaxial stress state of late Jurassic-early Cretaceous was discussed by inversion of tectonic trace stress and recovery of formation erosion in the same tectonic period of basin boundary. And the direction of horizontal maximum principal stress; Based on the compaction curve of mudstone and Newberry mechanical model, the additional tectonic stress and vertical geostress are calculated, and the values of triaxial principal stresses and differential stresses of the Upper Paleozoic in the study area in the late Jurassic-early Cretaceous are obtained. In the study area, the maximum principal stress is near level, the direction is SEE98 掳, the intermediate principal stress is nearly vertical, and the minimum principal stress is the NWW direction during the main curtain of Yanshanian movement. The triaxial principal stresses of the Upper Paleozoic reservoir (the average recovery depth is 4 600 m) in the main curtain of Yanshan movement are 93.2101.3MPa1 / 65.8g / 67.2MPa, respectively, and the differential stress is 40.1 / 48.0MPa. the result is a numerical simulation of the regional tectonic stress field. The prediction of reservoir fractures and the optimal selection of favorable areas of fractured reservoirs provide the necessary basis for oil and gas exploration.
【作者单位】：陕西延长石油(集团)有限责任公司;中国地质科学院地质力学研究所;中国地质大学地球科学与资源学院;
【基金】：国家高技术研究发展计划项目(No.2013AA064500) 陕西省科技统筹创新工程项目(No.2012KTZB03-03-01-01)
【分类号】：P618.13;P534.5

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