山东安丘——莒县断裂莒县盆地段地应力测试及断裂活动性研究

Ground Stress Test and Study on Fault Activities in Juxian Basin in AnqiuJuxian Fault in Shandong Province

摘要:

第四纪晚期以来，山东安丘莒县断裂莒县盆地段发生过较为强烈的活动。本次采用水压致裂法，对该段断裂进行了地应力测试，认为区域内地应力以构造应力为主，地应力结构为最大水平主应力（SH）＞最小水平主应力（Sh）＞垂直应力（Sv），易于使断裂发生走滑运动，且测区大部分为高地应力区—极高地应力区。采用库仑摩擦滑动准则，分析了断裂的稳定性，认为安丘莒县断裂莒县盆地段地应力测试值未达到断层滑动临界值。

Abstract:

There are strong activities since late Quaternary in Juxian basin in AnqiuJuxian fault By using hydraulic fracture method, ground stress test of this fault has been carried out. According to the analysis of ground sress test results, it is regarded that ground sress in the area is dominated by tectonic stress, and the ground stress structure is maximum horizontal principal stress（SH）> least horizontal principal stress （Sh ）> Vertical stress (Sv). It is easy to cause the strikeslip movement of the fault, and most of the test area is high ground stress area——extremely high ground stress area. At the same time, the Coulomb friction sliding criterion is used to analyze the stability of the fault. It is considered that the ground stress test value of Juxian basin in AnqiuJuxian fault does not reach the critical value of fault sliding.