基于断层摩擦强度的地应力计算模型

摘要

浅部断层附近的应力状态是影响地下硐室工程和石油勘探与开发的重要影响因素,浅部断层附近的岩石因构造运动处于弱胶结状态,常规的地应力测量方法在该处测量存在误差较大、成本较高、周期较长等不足.为此,本文在莫尔-库仑强度理论基础上,系统分析了断层附近的应力方向、断层摩擦系数定量化计算及断层摩擦强度之间的关系.文章最后将该地应力计算模型应用于成庄区域,与实测地应力吻合较好.研究结果对于地应力计算及油气田的安全高效生产具有指导意义.%The in-situ stress near the shallow faults is an important factor affecting underground chamber engineering and or oil exploration and development.Due to the tectonic movements,the shallow fault rocks are in weak cemented state.The conventional methods for measuring in-situ stress exist the deficiencies such as larger error,higher cost,longer cycle and so on.Based on the Mohr-Coulomb strength theory,this paper systematically analyzes the relationship of the in-situ stress near faults,the fault friction coefficient calculation and fault frictional strength.Finally,the in-situ stress model is applied to calculate the stress of Chengzhuang region.The results coincide with the measured results.The results have important implications for stress calculation,and efficient product of oil and gas.