海上多子阵立体组合气枪震源优化设计

The Optimal Design of 3D Air-Gun Arrays Combination in Marine Seismic Exploration

应用气枪震源子波模拟软件,针对海上常用的6子阵,进行了不同气枪阵列组合情形下的震源子波模拟试算,提出了适应深水区地震勘探要求的立体阵列组合和交错排列组合的气枪阵列。子波模拟试算结果表明,多子阵立体阵列的设计能优化震源子波,同时,将传统的子阵列排列改成交错排列,将气枪阵列的大容量气枪放置在子阵中间位置可以明显提高子波性能,为深水区复杂地质结构条件下的震源设计参数优化提供理论依据。

The seismic exploration in the area of deep water requires the wavelet blazed by air-gun arrays not only with strong primary,large P/B ratio and wide frequency band,but also with strong energy at low frequency,smooth spectra and relative strong energy at the notch frequency.This paper applies the soft of pressure signal simulation of air-gun array and calculate the wavelets of the different type of air-gun arrays consisting of six sub-arrays in common use in marine.We propose a combination of 3D staggered air-gun arrays to adapt to deep-water seismic exploration requirement.The wavelet simulated corresponding to this array shows that the design of 3D air-gun arrays can optimize source wavelet.Meanwhile,air-gun array designed by staggered arrangement and by the guns with large volume placed at the middle of sub-arrays can significantly improve the parameters of wavelet,which provides theoretical bases for the optimal design parameters of source under the conditions of the complex geological structure in deep-water seismic exploration.