摘要
海上地震勘探中,为了获得较高信噪比的气枪子波,通常利用气枪阵列进行组合激发。将气枪阵列中的各个子阵沉放于不同的水深处并延迟激发,形成立体阵列,可以有效地压制震源虚反射,提高远场子波振幅谱的陷频点能量,从而拓宽子波频谱。本文从原理上分析了不同水深的气枪子阵列的陷频特性,总结出对陷频点振幅能量补偿较好的立体阵列设计方式,并进行实测,以达到指导海上立体阵列设计、改善气枪阵列子波频谱的目的。
In marine seismic acquisition, air-gun array is usually used as the main seismic source. A traditional airgun array comprises＂ several subarrays deployed at the same depth. However, a multilevel air-gun array with subarrays at different depths can efficiently suppress the source ghost and enhance the amplitude at the notch frequencies thus the amplitude spectrum of air-gun array signature is broadened. In this paper, characteristic of the ghost notch is analyzed and a robust way of designing a multi-level air-gun array is explained and then verified. This can be widely used in marine seismic acquisition to design air-gun arrays with broadened amplitude spectrum.
出处
《物探装备》
2016年第5期285-289,323,共6页
Equipment for Geophysical Prospecting
基金
"国家重大专项项目课题2016ZX05024007-002"资助
关键词
海上地震勘探
远场子波
立体阵列
虚反射
陷频
marine seismic exploration, far-field signature, multi-level air-gun array, source ghost, notch
