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现今地应力场方向是油气藏开发方案编制、储层改造、注水开发等需要考虑的关键因素之一,针对构造变形对局部应力场方向的影响进行了研究。首先利用反映区域现今地应力场方向的各种资料确定了盐井沟构造沙溪庙组所在区域的现今地应力方向;利用钻井岩心进行了岩心古地磁定向、波速各向异性等实验,分析了构造核部钻井中现今地应力方向,对比发现井点处现今地应力方向与区域地应力方向不吻合,发生明显偏转;通过计算构造变形派生应力并与区域现今地应力场进行矢量叠加计算,认为现今地应力方向的偏转主要受构造变形所致。研究表明局部构造变形是造成现今地应力方向变化的一个重要因素,研究必须考虑大幅度变形构造上现今地应力方向。
The direction of the geostress field is one of the key factors that need to be considered in the preparation of reservoir development plans, reservoir alteration and water injection development. The influence of tectonic deformation on the direction of local stress field is studied. Firstly, the current geostress direction of the Shaximiao Formation in the Yanjinggou is determined by various data that reflect the direction of the present geostress field in the area. Experiments of the paleomagnetic orientation and the wave velocity anisotropy of the core are conducted by using the drilling core. The present geostress direction in core drilling is compared to find that the current stress direction at well point does not coincide with the direction of regional geostress and a significant deflection occurs. By calculating the deformation derived stress and carrying out vector superposition calculation with the present geostress field in the area, The deflection in the direction of geostress is mainly caused by the structural deformation. The study shows that the local tectonic deformation is an important factor that causes the current direction of the in-situ stress changes. Therefore, the study must consider the direction of the present geostress on the tectonic deformation.