中强地震前油井动态异常机理研究

在分析油井映震特征的基础上，着重对油井动态异常的形成机理进行了研究。认为：映震灵敏井孔的空间分布主要受应力易于集中的构造条件的控制，特别是断层的又汇处、转折端和断裂带，这是与其他流体观测项目的相同之处；在本研究中，首次提出了油井动态前兆异常形成的三种力学过程，即岩土力学过程、水动力学过程和气体动力学过程以及油井特有的二种”放大”作用（变径和气体膨胀）的观点；解释了油井动态震前多为正异常的力学机制。

STUDY OF MECHANISM OF OILWELL DYNAMIC ANOMALIES BEFORE MODERATE AND STRONG EARTHQUAKES

Based on the oilwell feature to reflect earthquakes. we have studied the mechanism of oilwell dynamic anomaly formation. It is thought that the spacial distribution of sensitive wells to renect earthquakes is controlled by the tectonic condition of stress assembling especcally in the cross section offault, turning point and fault belt. This is the same as the other fluid observation items. It is proposedfor the first time the three force processes of oil well dynamic procursor anomaly formation (they arerock soil mechanics, water dynamic mechanics, and gas dynamic mechannics) and that the view of pointof 2 sorts of special magnifying functions (radius variance and gas expansion) of oil wells. Inner forcecauses of positive anomaly of oil well dynamic state are interpreted.