管波探测的波场震相属性探讨

Discussion on the attributes of the phases in Tube wave filed

管波探测是近年来发展起来的一种适用于工程勘察的井中地球物理探测新技术。笔者利用实际管波测井资料,在管波波场分析的基础上,对管波波场的震相属性进行了分析和探讨。分析结果表明:管波探测不仅可以检测井孔的完整性,而且可以直观地呈现井孔中地层的变化特征;管波探测波场的折射波初至可以清楚地反映井孔中地层的变化特征。同时,在波场特征分析中还发现了二次反射管波R*震相。

The Tube wave detection is a new downhole geophysical technique used in geological engineering in recent years.Based upon the observed data of tube waves,this paper tries to analyze the kinematic characteristics of the different phases in the Tube wave field.The results from this analysis show that the technique not only can detects t the integrity of a downhole,but also can map the variation of the geological structure along the downhole by the traveltimes of refracted Tube wave from the drill wall.Meanwhile,the unknown phases R* is found in this study,the phase R * should be the twice reflection of phase R1 acoording to the twice traveltimes of the original reflections.