判定现今局部应力方向的一种新方法

摘要

区域应力与局部应力方向存在差异,不能简单地把区域应力方向当作局部构造应力方向.根据力学分解特征,提出了用区域主应力方向沿构造等高线进行分解以求取局部应力方向的方法.根据北部湾盆地内目的层的构造等高线,用该方法求得S1井目的层的局部应力方向为NNW-SSE向和SWW-NEE向.该应力方向与S1井成像测井分析求得的局部应力方向完全吻合,从而说明本文提出的新方法具有可行性,可以在该区域内推广.%The difference exists in the orientation between the local stress and regional stress. So it is not proper to define the regional stress direction as the local stress direction. According to mechanical decomposable characteristics, the local stress direction is defined as the component of the regional stress direction along the contour line in this paper. Based on this method, the local stress orientation of well SI in Beibuwan basin is NNW-SSE and SWW-NEE. This local stress orientation is consistent with that analyzed by imaging logging. So the novel method proposed in this paper is feasible and can be popularized in this region.