基于近场测量气枪阵列远场子波模拟软件研发

Development of software based on near-field measurement of airgun array for simulation of far-field wavelet

气枪阵列的远场子波是考察气枪阵列优劣的重要指标,同时气枪阵列远场子波也是后续地震资料处理的重要参数之一[1]。即使稳定性极好的气枪阵列,在实际生产中,由于海水的浓度、温度、流速等因素的变化,其子波都会有一定程度的改变。能够在生产中随着气枪激发而实时获取阵列子波越来越受到重视。而极浅海海域水深较浅(一般在几十米以内),无法满足记录远场子波的要求,解决的途径是实时记录阵列中各单元的近场子波,而后利用计算机模拟计算出整个阵列的远场子波。本文主要研究基于近场测量气枪阵列远场子波模拟软件的研发。文章围绕如何读取近场子波数据,如何去除虚反射,如何利用近场子波合成远场子波进行了深入研究,提出了相应的技术措施,完成了远场子波模拟的全过程。

The far-field wavelet of airgun array is the important criteria for evaluating airgun array, and also is one of the important parameters for seismic data processing after acquisition. In the field, the wavelet of airgun array with good stability though, will vary in some degree with the consistency, temperature and fluid-velocity of sea water. How could obtain the wavelet of airgun array in real-time while shooting is paid more and more attention to. In the extra-shallow water zone with only tens of meters deep, airgun arrayrs far-field wavelet couldn＇t be recorded~ but a solution has been put forward by real-time recording near-field wavelet of each element in airgun array to calculate far-field wavelet on the computer. This paper stated mainly the software development of stimulating the far-field wavelet based on near-field wavelet recording of airgun array and detailed how to read near-field wavelet data, how to remove ghost reflection, and synthesize far-field signature using near-field records, presented correspondent technical measures and finished whole process of far-field wavelet simulation.