立体延迟气枪震源分析

A delayed up-down sub-array airgun source

立体延迟气枪震源可拓展平面震源的低频端能量、补偿高频端的陷波点,有利于深海油气地震勘探的中深部目的层成像。基于四子阵列气枪震源,本文对比了不同排列方式、不同激发延迟值时立体阵列的输出特征;利用优选出的凸形立体延迟阵列在深水区开展地震资料采集,获得比平面阵列更高信噪比及分辨率的地震数据;着重讨论了子阵列深度差、激发时间差、阵列对称性及关枪标准等主要影响因素,给出了中肯的建议。

As a marine seismic source,delayed up-down sub-arrays can expand both low frequency and high frequency compared with conventional flat array,which would be very helpful for deep target imaging in marine hydrocarbon seismic exploration.On the basis of four sub-arrays source,we analyze in the paper airgun output characteristic values with different array modes and different delay times.Using preferable convex arrays in deepwater acquisition,we obtain seismic data with higher signal to noise ratio and higher resolution.Meanwhile we discuss a few issues such as subarrays depth,delay time,array symmetry,and off gun standard,and put forward some suggestions.