Abstract: The mechanism of borhole breakouts, its formation environment and relation with the present-day tectonic stress field are presented in this paper; The logging principle of ultrasonic borehole televiewer, operating techniques and analyzing method of borehole breakout data are also described. In high seismic area of Jianchuan, the orientation of the maximum horizontal compressive stress is N20癊 determined by the borehole breakouts obtained from the ultrasonic borehole televiewer logging data in an 800m deep well, It is very consistent with N15癊 of those measured using the hydraulic fracturing method in the same well.

Key words: Borehole breakouts, Ultrasonic borehole televiewer, Borehole televiewer logging

摘要： 本文论述了钻孔崩落的力学机制、产生环境及其与现今构造应力场的关系,介绍了超声波井下电视的测井原理、操作技术和钻孔崩落测井资料分析方法。根据一口800米深钻孔的超声波井下电视测井获得的崩落资料,确定剑川地震活动区最大水平主应力方向为N20°E。这与近两年来在该区采用水压致裂法测定的最大水平主压应力方向N15°E是十分一致的。

关键词: 钻孔崩落, 超声波井下电视, 井下电视测井