本文選題：大地電磁　切入點(diǎn)：遠(yuǎn)參考　出處：《石油地球物理勘探》2017年06期

【摘要】：首先分析了基站存在不同噪聲強(qiáng)度時(shí),遠(yuǎn)參考大地電磁對(duì)測(cè)深曲線的影響,發(fā)現(xiàn)在低信噪比條件下,常規(guī)遠(yuǎn)參考大地電磁數(shù)據(jù)對(duì)測(cè)深曲線質(zhì)量的提升有限,不能滿足后續(xù)資料處理的要求;然后對(duì)攀西地區(qū)實(shí)測(cè)磁場(chǎng)資料進(jìn)行統(tǒng)計(jì)分析,結(jié)果認(rèn)為最遠(yuǎn)相隔40km的長(zhǎng)周期大地電磁測(cè)深點(diǎn)的各個(gè)磁道數(shù)據(jù)具有很好的相關(guān)性。因此提出利用基于參考站與基站之間磁場(chǎng)相關(guān)的遠(yuǎn)參考大地電磁法來篩選功率譜,避免了常規(guī)遠(yuǎn)參考大地電磁法僅關(guān)注噪聲與信號(hào)之間、或者基站噪聲與參考站噪聲之間的非相關(guān)性,卻未考慮基站與參考站磁場(chǎng)信號(hào)之間的相關(guān)性這一局限,以達(dá)到去除磁場(chǎng)噪聲的目的。實(shí)驗(yàn)數(shù)據(jù)及實(shí)測(cè)數(shù)據(jù)處理結(jié)果表明,基于磁場(chǎng)相關(guān)的遠(yuǎn)參考大地電磁法效果優(yōu)于常規(guī)遠(yuǎn)參考大地電磁法,證明了該方法的有效性和正確性。
[Abstract]:Firstly, the influence of remote reference magnetotelluric on the sounding curve is analyzed when the base station has different noise intensity. It is found that under the condition of low signal-to-noise ratio, the conventional remote reference magnetotelluric data can improve the quality of the sounding curve limited. Can not meet the requirements of subsequent data processing, and then statistical analysis of the measured magnetic field data in Panxi region, The results show that there is a good correlation between the longperiod magnetotelluric sounding data of the most distant 40km, so a far-reference magnetotelluric method based on the magnetic field correlation between the reference station and the base station is proposed to screen the power spectrum. It avoids the limitation that conventional remote reference magnetotelluric method only focuses on the non-correlation between noise and signal, or between base station noise and reference station noise, but does not consider the correlation between base station and reference station magnetic field signal. In order to remove the magnetic field noise, the experimental data and the measured data show that the effect of the magnetotelluric method based on magnetic field correlation is better than that of the conventional remote reference magnetotelluric method, which proves the validity and correctness of the method.
【作者單位】： 西南科技大學(xué)環(huán)境與資源學(xué)院;四川理工學(xué)院;成都理工大學(xué)地球物理學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(41704105) 中國博士后科學(xué)基金項(xiàng)目(2017M610611) 國家“863”計(jì)劃項(xiàng)目“長(zhǎng)周期分布式大地電磁觀測(cè)系統(tǒng)”(2014AA06A612) 國家重大科學(xué)儀器設(shè)備開發(fā)專項(xiàng)“大深度三維電磁探測(cè)技術(shù)工程化開發(fā)”(2011YQ05006007)聯(lián)合資助
【分類號(hào)】：P631.325

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