【摘要】 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。更多还原

【Abstract】 Current geo-stress orientation is one of the factors critical to oil and gas reservoir development scheme programming, reservoir reconstruction, and waterflooding development. This paper is to study the effect of tectonic deformation on local geo-stress orientation. Firstly, the data reflecting the current geo-stress orientation are used to determine the current geo-stress orientation of the area where the Shaximiao Formation of Yanjinggou Structure is located. The geo-stress orientation during the drilling of the core of structures is analyzed by conducting the experiment on palaeomagnetic direction and wave velocity anisotropy using drill core. Comparative analysis shows that the geo-stress orientation of the well spots does not coincide with the local geo-stress orientation, and it deflects obviously. Through the overlying calculation between the tectonic deformation induced stress and the local current geo-stress, it is considered that the deflection of current geo-stress orientation is mainly caused by tectonic deformation. Research in this paper shows that local tectonic deformation is a major factor leading to the variation of current geo-stress orientation. So the research on current geo-stress orientation of deformed structures must be paid great attention.更多还原