Phase Characteristic Analysis of Continuous Depth Air-Gun Source Wavelet  

作　　者：XING Lei LIU Huaishan ZHENG Xilai LIU Xueqin ZHANG Jin WANG Linfei ZOU Zhihui XU Yiming 

机构地区：[1]Key Laboratory of Submarine Geosciences and Prospecting Techniques, Qingdao 266100, P. R. China [2]Key Laboratory of Marine Environment and Ecology, Qingdao 266100, P. R. China [3]College of Marine Geosciences, Ocean University of China, Qingdao 266100, P. R. China

出　　处：《Journal of Ocean University of China》2016年第5期815-824,共10页中国海洋大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 41304096, 41230318);National High-tech R&D Program of China (863 Program) (No. 2013AA0925010201);Foundation of Ministry of Education of China (No. 20130132120014);the Fundamental Research Funds for the Central Universities (Nos. 1313017, 1362013)

摘　　要：Air guns are important sources for marine seismic exploration. Far-field wavelet of air gun arrays, as a necessary parameter for pre-stack processing and source models, plays an important role during marine seismic data processing and interpretation. When an air gun fires, it generates a series of air bubbles. Similar to onshore seismic exploration, the water forms a plastic fluid near the bubble; the farther the air gun is located from the measurement, the more steady and more accurately represented the wavelet will be. In practice, hydrophones should be placed more than 100 m from the air gun; however, traditional seismic cables cannot meet this requirement. On the other hand, vertical cables provide a viable solution to this problem. This study uses a vertical cable to receive wavelets from 38 air guns and data are collected offshore Southeast Qiong, where the water depth is over 1000 m. In this study, the wavelets measured using this technique coincide very well with the simulated wavelets and can therefore represent the real shape of the wavelets. This experiment fills a technology gap in China.Air guns are important sources for marine seismic exploration. Far-field wavelet of air gun arrays, as a necessary parameter for pre-stack processing and source models, plays an important role during marine seismic data processing and interpretation. When an air gun fires, it generates a series of air bubbles. Similar to onshore seismic exploration, the water forms a plastic fluid near the bubble; the farther the air gun is located from the measurement, the more steady and more accurately represented the wavelet will be. In practice, hydrophones should be placed more than 100 m from the air gun; however, traditional seismic cables cannot meet this requirement. On the other hand, vertical cables provide a viable solution to this problem. This study uses a vertical cable to receive wavelets from 38 air guns and data are collected offshore Southeast Qiong, where the water depth is over 1000 m. In this study, the wavelets measured using this technique coincide very well with the simulated wavelets and can therefore represent the real shape of the wavelets. This experiment fills a technology gap in China.

关 键 词：wavelet Wavelet requirement cable bubble consistency continuity processed coincide viable 

分 类 号：P631.46[天文地球—地质矿产勘探]