【摘要】 本文提出一种激发井与接收井互换的井中地震观测方法,即将非零源距VSP观测系统置于井中,据此得到靠近接收井一侧的半空间反射波成像,再将激发井与接收井互换进行观测,得到另一半空间的反射波成像,最后将两者合在一起得到井间目的层的一个完整成像。这种方法通过优化观测系统设计,合理论证入射角度、覆盖次数等特征参数并控制激发点数,完全避开了近地表的影响,大大节省了测量时间,其数据质量是常规VSP数据无法比拟的。此种观测方式适用于采集反射波资料,其成果更易于与VSP和地面地震资料联合进行地质解释,而且可以避免常规井间地震获得的广角反射资料中存在的问题。更多还原

【Abstract】 The paper presented a shooting hole and receiving hole transposed cross-hole seismic surveying method, that is to take non-zero offset VSP geometry into hole, the imaging of reflection waves in half space of receiver-hole side is obtained; and then, surveying is carried out by transposition of shooting hole and receiver hole, the imaging of reflection waves in other half space is obtained, finally, put both images together to get a complete image of cross-hole targets. The method completely avoids the influence of near surface by optimizing the design of geometry, reasonable demonstration of characteristic parameters such as incident angle and folds and controlling the number of shooting point, which greatly saves surveying time, and data quality is unmatchable to common VSP data. This surveying way is suitable for acquisition of reflections data, and their results are easier to carry out joint geologic interpretation with VSP and surface seismic data and can avoid the trouble brought about by wide-angle reflections data in common cross-hole seismic survey.更多还原