水库大容量气枪震源激发条件优化实验研究

The study on optimizing the excitation condition of large volume air gun source in reservoir

通过人工拾取震相,统计记录台站数、台站最远观测距离、接收能量等3个参数,自主研发了最优工况处理软件来研判工况激发效果,并确定棉花滩水库最优工况为水深25m,枪阵沉放深度9m,枪阵尺寸7m×7m。对定点300次激发的每10次累计叠加结果进行分析后发现,叠加1090次时激发效果快速增强,100150次时缓慢增强,160240次时快速增强,250300次时缓慢增强,即随着叠加次数的增加,激发效果增强,传播距离和记录台数也逐步增加。

We developed an optimal condition processing software to evaluate the excitation effect of operating condition on the basis of artificial picking up seismic phase,and the statistics of recording station number,the farthest observation distance and energy received.The optimal conditions of Mianhuatan Reservoir are determined through the software as the water depth of 25m,pikes sink depth of 9m and pikes size of 7m×7m.At the same time,accumulative stacking results of every 10 times are analyzed in fixed-point excitation of 300 times.It is concluded that 10 to 90 times stacking has a rapidly rising excitation effect,the excitation effect of 100 to 150 times stacking is slowly rising,that for 160 to 240 times stacking increases rapidly and 250 to 300 times stacking excitation effect is rising slowly.With the times of stacking increase,the propagation distance and the number of record stations also increase gradually.