高干扰环境下西安市地裂缝勘查新方法

A NEW METHOD FOR GROUND FISSURE EXPLORATION IN THE HIGH-INTERFERENCE ENVIRONMENT OF XI'AN CITY

针对西安市区人文环境影响大、噪声背景干扰强、城区施工牵涉到道路交通、市政管线等诸多部门,造成地裂缝勘查工作难度大的特点,首次采用可控震源以及特殊的地震数据采集技术。通过最佳工作参数的选择,采取相应抑噪措施,最大程度地保证了勘查数据质量。地震数据处理除了采用常规浅层地震处理技术,还提出了相应的汽车干扰、市电干扰、强能量干扰及弯线校正等一系列技术处理方法。提高了解释精度,实现了城市高干扰环境下地裂缝地震勘查的技术突破。为探索研究西安市区地裂缝形成机理研究提供了可靠的地球物理基础资料。

In Xi＇an City,there are many disadvantages for ground fissure exploration,such as the human＇s strong influence on environment and the intense background noise interference.In this study,good result was obtained by adopting the controllable vibrator technique and unique data processing technology.Through selecting the optimal working parameters and employing the appropriate measures for suppressing noise,the authors ensured the high quality of the exploration data.In the shallow seismic data processing process,besides the conventional data-processing technology,the authors put forward the corresponding technical processing countermeasures for such interferences as vehicle interference,electrical interference,strong energy interference and curve correction.Using the new method of ground fissure exploration,the authors improved the data precision and made a breakthrough in the high-interference fissure exploration under urban conditions.The results also provide reliable geophysical data for studying the formation mechanism of the fissures in Xi＇an City.