断层对地应力场影响的有限元研究

Study of finite element on egfects of faults on ground stress field

断层应力场研究是油气田开发等工程领域的难题之一。应用有限元方法研究了断层对地应力场的影响规律,考虑的因素包括断层两侧围岩的力学性质(弹性模量、泊松比等)、断层介质的力学性质、断层的几何形态及边界条件。研究表明,这些因素对断层附近的地应力场分布有不同程度的影响,其改变均能使地应力大小和方向发生变化,研究结果为油田断层发育区地应力的研究提供了参考依据。

Fault stress field study is one of problems in oil and gas field development. The effect rules of faults on ground stress field are studied by using finite element method, and several factors are considered including mechanical property of surrounding rock of both side of faults （ elastic modeling quantity, Poisson ratio, etc. ）, mechanical property of faulted medium, fault geometry and edge conditions. The results indicate that, these factors have different influences on stress field distribution near faults. Their changes all make ground stress degree and direction varied. This study result provides reference for ground stress analysis in fault development zone of oilfield.