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

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Applied Geophysics Pub Date : 2024-08-22 DOI:10.1007/s11770-024-1126-3
Yong-fei Qi, Zhou-hong Wei, Ming-tao Nie, Guo-fa Li, Tao Wang, Hai Ling, Sheng-kui Cong, Xin-yang Chen, Chang-ping Duan, Yang Liu
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Abstract

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 flow provided by the hydraulic systems at the low-frequency stage, causing difficulty 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.

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低频扫频设计--中东沙漠环境案例研究
低频震源采集已成为陆地地震勘探的常规操作,因为低频信号在描述地质结构特征和增强深部勘探目标成像方面具有优势。低频扫描设计技术的两个关键点包括控制失真和提高低频阶段的输出能量。然而,振动器在低频阶段受限于液压系统提供的最大流量,难以满足勘探能量要求。首先,对振动器的低频采集性能进行了理论分析。通过理论公式的指导,结合振动器的实际参数,得出 10 赫兹以下的理论最大输出力。然后,根据操作区域的表面特征对信号进行优化。最后,制定了详细的应用质量控制和操作程序。新的低频扫频设计方法克服了液压系统的最大流量限制,提高了低频能量,实现了宽带采集。所设计的信号已在中东沙漠地区的各种地面上进行了测试和应用,取得了良好的性能。所提出的低频扫描设计方法对于传统震源在低频采集中的应用具有相当大的价值。
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来源期刊
Applied Geophysics
Applied Geophysics 地学-地球化学与地球物理
CiteScore
1.50
自引率
14.30%
发文量
912
审稿时长
2 months
期刊介绍: The journal is designed to provide an academic realm for a broad blend of academic and industry papers to promote rapid communication and exchange of ideas between Chinese and world-wide geophysicists. The publication covers the applications of geoscience, geophysics, and related disciplines in the fields of energy, resources, environment, disaster, engineering, information, military, and surveying.
期刊最新文献
Earthquake detection probabilities and completeness magnitude in the northern margin of the Ordos Block Multi-well wavelet-synchronized inversion based on particle swarm optimization Low-Frequency Sweep Design—A Case Study in Middle East Desert Environments Research on Paleoearthquake and Recurrence Characteristics of Strong Earthquakes in Active Faults of Mainland China Capacity matching and optimization of solar-ground source heat pump coupling systems
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