范氏气体下单空气枪震源子波模拟  

Wavelet Simulation of Single Air-gun in Conditions of Van Der Waals Gas

作　　者：王立明[1,2] 许江[1] 胡毅[1] 

机构地区：[1]国家海洋局第三海洋研究所海洋与海岸地质实验室,福建厦门361005 [2]长安大学地质工程与测绘学院,陕西西安710064

出　　处：《工程地球物理学报》2017年第2期141-144,共4页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学青年基金(编号:41204100);南北极环境综合考察与评估专项(编号:CHINARE2017-03-03;CHINARE2017-04-03);福建省自然科学基金资助项目(编号:2013J05059);国家海洋局青年海洋科学基金(编号:2013338);国家海洋局第三海洋研究所基本科研业务专项项目(编号:海三科2011026)

摘　　要：空气枪广泛应用于海洋地震勘探,但野外现场中震源子波的获取非常困难,条件也苛刻。因此利用空气枪震源子波模拟方法得到震源子波信号是一种行之有效的手段。以准静态开放式热力学系统与气泡振荡运动过程理论为基础,同时为了更符合空气枪中的高压气体,引入了范氏气体,建立了单空气枪震源子波模型。通过震源子波模型模拟与实测子波数据对比表明,单空气枪震源子波模型模拟的结果与实测子波能较好的吻合,从而得出了该模型能准确模拟实测子波波形,而且操作上方便实用。Air-guns are widely used in marine seismic exploration,but it is very difficult and harsh to obtain seismic wavelet in the field.Therefore,it is an effective method to obtain the source wavelet by using air gun source wavelet simulation method.Based on the theories of the quasi-static open thermodynamics system and motion of bubble oscillation,and in order to fit the high-pressure gas in air-gun,Van Der Waals gas is introduced and a wavelet model of single air gun source is established.The comparison between the data of the wavelet model of the source wavelet and the data of the measured wavelet shows that the simulation results of the single-air gun source wavelet model are in good agreement with the data of the measured wavelet,which supports the model to accurately simulate the measured wavelet waveform and is easy to be for operation.

关 键 词：空气枪 气泡振荡 范氏气体 子波模型 

分 类 号：P631.4[天文地球—地质矿产勘探]