| 疏松地表可控震源高频畸变分析及改善方法 |
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| 引用本文： | 张剑,赵国勇,宋宁宁.疏松地表可控震源高频畸变分析及改善方法[J].地球物理学进展,2020(1):250-257. |
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| 作者姓名： | 张剑 赵国勇 宋宁宁 |
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| 作者单位： | 中石化石油工程地球物理有限公司胜利分公司 |
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| 基金项目： | 中国石油化工股份有限公司科技攻关“沙漠区可控震源高效地震采集现场试验”项目(JP16028)资助. |
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| 摘 要： | 针对可控震源高频拓展,一些使用者只是简单提高高频截止频率,出现了较多问题,如在沙漠、草场等疏松地表区域会出现高频畸变,严重影响了资料品质.为此,从高频段畸变现象入手,建立可控震源与地表振动模型,深入研究了震源振动输出力信号.分析表明高频段重锤与平板加速度之间产生较大相位差,造成可控震源系统过载是产生高频畸变的原因,并进一步提出了高频优化能量补偿扫描技术的方法改善高频畸变,通过试验对比说明了该方法能够提高高频输出信号的稳定性,降低高频畸变,也为以后解决类似问题提供帮助.
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| 关 键 词： | 疏松地表 可控震源 相位差 高频畸变 高频优化 扫描信号设计 |
Analysis and suppressing of high frequency distortion on loose near surface in vibroseis acquisition |
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| ZHANG Jian,ZHAO Guo-yong,SONG Ning-ning.Analysis and suppressing of high frequency distortion on loose near surface in vibroseis acquisition[J].Progress in Geophysics,2020(1):250-257. |
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| Authors: | ZHANG Jian ZHAO Guo-yong SONG Ning-ning |
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| Institution: | (Sinopec Geophysical Corporation,Shengli Branch,Dongying 257100,China) |
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| Abstract: | When expanding the high frequency in vibroseis acquisition,some users simply improved the cut-off frequency.It caused many problems such as high frequency distortion in the desert,grassland and other loose surface area,which seriously affected the data quality.Therefore,based on the high frequency distortion phenomenon,the model of vibroseis and ground vibration is built and the output force research is carried out.It’s concluded that the overload of the vibroseis system caused by phase difference between the hammer force and the accelerated velocity is the reason for high frequency distortion in loose surface.Thus,a new method named optimization sweep technology at high frequency is put forward to improve this situation.Contrast test was carried out,which proved that these methods can effectively improve the steadiness of the high frequency output signal and reduce the distortion.It can also help solve similar problems afterwards. |
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| Keywords: | Loose near surface Vibroseis acquisition Phase difference High frequency distortion High frequency optimization Sweep signal design |
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