| 摘要: |
| 海洋地震勘探过程中，水中放置的空气枪与船体之间须保持一定安全距离，否则引起船载设施和仪器剧烈抖动，影响船舶设施和仪器的安全运行，甚至更严重情况下，有可能造成船体的损坏.利用海水压力脉冲与船体受到的冲击压力关系，结合建立的空气枪震源子波模型模拟近场震源子波，可计算出船体与空气枪间的安全距离.研究结果表明，根据震源子波模型模拟的近场子波主峰值，总容量150in3G枪、300 in3相干G枪及760 in3相干G枪的安全距离分别为3.90、6.57 m和9.13 m.由此可知，空气枪与船体间距离只有大于安全距离，才能避免船体大的振动或设备免遭损害，保证海洋地震勘探有效、安全的进行. |
| 关键词: 海洋地质学 空气枪 安全距离 子波模型 近场震源子波 |
| DOI： |
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| 基金项目:国家自然科学青年基金资助项目（41204100）；福建省自然科学基金资助项目（2013J05059）；国家海洋局青年海洋科学基金资助项目（2013338）；国家海洋局第三海洋研究所基本科研业务专项资助项目（海三科2011026）；南北极环境综合考察与评估专项资助项目（CHINARE2016 03 03, CHINARE2016 04 03, CHINARE2016 01 03, CHINARE2016 04 01） |
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| Quantitative simulation analysis on the safe distance between the hull and the air guns |
| WANG Liming,HU Yi,XU Jiang,LIU Baohua |
| (Ocean and Coast Geology Laboratory， Third Institute of Oceanography， SOA， Xiamen 361005， China;Chang an University， Xian 710064;National Deep Sea Center. SOA， Qingdao 266061， China) |
| Abstract: |
| During marine seismic exploration process， the position of air-guns in water must keep a safe distance with the hull. Without doing so， air-gun source will cause shipboard facilities and equipment severely shaking， which affects the safe operation of ship. Even worse， it may cause damage to the hull. With consideration of the relationship between seawater pressure pulse and the impact pressure towards the ship and combination of the air-gun source wavelet model which stimulates the near-field source wavelet， the safe distance between the hull and the air-guns can be calculated. Research results show that the safe distance of total capacity 150 in3 G gun， 300 in3 coherent G guns and 760 in3 coherent G guns are 3.90 m， 6.57 m and 9.13 m， respectively， according to peak value of near-field wavelet simulated by air-gun source wavelet model. It can be known that the distance between the place of air-guns and the hull should be greater than a safe distance in order to avoid large vibration of the hull or equipment from damage and to ensure effective and safe marine seismic exploration． |
| Key words: marine geophysics air-gun safe distance wavelet model near-field source wavelet |
