Optimal acquisition time estimation method for CSEM with high-order pseudo-random signal

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-09-12 DOI:10.1016/j.jappgeo.2024.105517
Yang Yang , Chen Xiong , Heng Zhang , Min Huang , Wenyan Zhang , Yuzhen Zhu
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Abstract

High-order pseudo-random signal is gradually being applied in controlled-source electromagnetic (CSEM) exploration. In contrast to the conventional single-frequency sweep mode, the high-order pseudo-random signal enables simultaneous transmission of multiple frequencies. However, estimating a fixed acquisition time based on observed noise levels often results in poor adaptability for high-order pseudo-random signal, which only require reception of one set of waveform. In this study, we presented an estimation method for acquisition time for CSEM with high-order pseudo-random signal using an improved logistic function. The improved logistic function was proposed to introduce a time-decay factor into the governing equation for the first time. By considering the transformation rule of noise statistical characteristics with time, the specific parameters of the function have been determined to better describe the dynamic evolution process of the signal quality. The effective frequencies were extracted at various acquisition times based on the noise evaluation number, and the resulting quantity of effective frequencies was used as the fitting target. Guidance for the fieldwork was determined based on the average time of the saturation period, in accordance with the properties of the function. The reliability of the improved logistic function was validated through a transmission current data simulation. The proposed method was demonstrated through the measured data from both strong and weak interference areas.

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采用高阶伪随机信号的 CSEM 最佳采集时间估算方法
高阶伪随机信号正逐渐应用于可控源电磁勘探(CSEM)。与传统的单频扫描模式相比,高阶伪随机信号可同时传输多个频率。然而,根据观测到的噪声水平估算固定的采集时间往往会导致高阶伪随机信号的适应性较差,因为高阶伪随机信号只需要接收一组波形。在本研究中,我们提出了一种利用改进的对数函数估算 CSEM 高阶伪随机信号采集时间的方法。改进的对数函数首次在控制方程中引入了时间衰减因子。通过考虑噪声统计特性随时间变化的规律,确定了函数的具体参数,以更好地描述信号质量的动态演变过程。根据噪声评价数提取了不同采集时间的有效频率,并将得到的有效频率量作为拟合目标。根据该函数的特性,以饱和期的平均时间为基础确定现场工作的指导。通过传输电流数据模拟验证了改进后的逻辑函数的可靠性。通过强干扰和弱干扰区域的测量数据,证明了所提出的方法。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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