复杂城镇井炮三维地震勘探非常规采集观测设计

Unconventional geometry design for 3D seismic exploration with explosive in complex towns

在农田和城镇等障碍物密布的复杂三维井炮勘探设计中,采用常规办法很难满足勘探要求。提前踏勘工区,摸清障碍物范围;进行岩性调查和通过药量参数实验确定合理的井深和药量;采用网格化的非常规精细化束状设计来进行炮点设计;在大范围障碍物密集区域,采用加密检波线以接收点代替激发点的辅助方法,弥补炮点不能布设的空白区域导致的覆盖次数不足的情况。这种方法成功地解决了常规束状三维设计导致的炮点和覆盖次数缺失太大而不能满足地质任务要求的难题。

Methods of conventional geometry design are difficult to meet the exploration requirements in 3-D complex exploration with explosive where covering densely packed obstacles such as farmland and towns.Scouting work area in advance,knowing the extent of obstacles,carrying out lithology investigation for determining reasonable well depth and parameter charge test of charge number,and use the unconventional bunch source point design.In a large area with dense obstacles,the auxiliary method of encrypting extra receive lines to replace source points by receive points is adopted to make up for the problem of insufficient fold caused by the blank area where source points cannot be laid.This method successfully solves the problem that conventional 3-D design which leads to too large gap of source points and fold to meet the requirements of geological tasks.