Low-Frequency Sweep Design—A Case Study in Middle East Desert Environments  

低频扫描信号设计-中东沙漠区案例研究

作　　者：Qi Yong-fei Wei Zhou-hong Nie Ming-tao Li Guo-fa Wang Tao Ling Hai Cong Sheng-kui Chen Xin-yang Duan Chang-ping Liu Yang 齐永飞;魏周宏;聂明涛;李国发;王涛;凌海;从胜奎;陈新阳;段昌平;刘洋(中国石油大学(北京)地球物理学院,北京102249;中国石油集团东方地球物理公司,河北涿州072750;INOVA物探装备公司,德克萨斯州77487)

机构地区：[1]China University of Petroleum,Beijing,102249,China [2]BGP,CNPC,Zhuozhou,072750,China [3]INOVA,13000 Executive Dr,Suite 100,Sugar Land,TX 77478,USA

出　　处：《Applied Geophysics》2025年第1期71-83,233,共14页应用地球物理(英文版)

基　　金：The authors would like to express their sincere appreciation to the research project of CNPC Geophysical Key Lab(2022DQ0604-4);National Natural Science Foundation of China(Grant No.42074141).

摘　　要：Low-frequency vibroseis acquisition has become a routine operation in land seismic surveys,given the advantages of low-frequency signals in characterizing geological structures and enhancing the imaging of deep exploration targets.The two key points of low-frequency sweep design techniques include controlling the distortion and improving the output energy during the low-frequency stage.However,the vibrators are limited by the maximum fl ow provided by the hydraulic systems at the low-frequency stage,causing diffi culty in satisfying exploration energy requirements.Initially,a theoretical analysis of the low-frequency acquisition performance of vibrators is conducted.A theoretical maximum output force below 10 Hz is obtained by guiding through theoretical formulas and combining actual vibrator parameters.Then,the signal is optimized according to the surface characteristics of the operation area.Finally,detailed application quality control and operational procedures are established.The new low-frequency sweep design method has overcome the maximum flow limitations of the hydraulic system,increased the low-frequency energy,and achieved broadband acquisition.The designed signal has been tested and applied on various types of ground surfaces in the Middle East desert region,yielding good performance.The proposed low-frequency sweep design method holds considerable value for the application of conventional vibroseis in low-frequency acquisition.由于低频信号在地质构造细节刻画和改善深层勘探目标成像效果方面的优势,可控震源低频信号激发已经成为陆上地震勘探的常规作业方法。低频信号激发的两个关键点在控制低频畸变和提高激发能量。然而,由于可控震源在低频段受液压系统提供最大流量的限制,其激发能量难以满足勘探需求。本文首先对可控震源低频激发性能进行严谨的理论分析;然后通过理论公式指导,结合实际震源参数获得10Hz以下震源理论最大输出力;并结合生产激发地表特性,进行信号优化调整;最后制定了详细应用配套质控和操作流程。通过新低频信号设计方法,突破液压系统能够提供最大流量限制,提高低频能量,实现宽频激发。设计信号在中东沙漠区各种类型地表进行测试和生产应用均取得了良好的效果。文章提出的低频信号设计方法,在常规震源低频激发应用方面具有很好的推广应用价值。

关 键 词：VIBROSEIS Low-frequency sweep design 

分 类 号：TN9[电子电信—信息与通信工程]