In seismic exploration,the low frequencies have played a significant role in increasing the resolution of seismic images in recent years.In practice the geophones usually have 10 Hz natural frequency,which indicates the distortion of the seismic signals bellow 10 Hz.The broad replacement of 10 Hz geophones with the low-frequency geophones can get "real" low frequency.This replacement process however,meets with many challenges, such as difficulties in research,long period of experiments,and high cost of low-frequency geophones.To mitigate the difficulties caused by these challenges the authors propose a practical method to estimate and recover the valid low frequencies of the conventional geophone data. In order to solve the problem of low frequency distortion in conventional geophone seismic data,the author put forward a practicable conventional low-frequency detector recovery method for low frequency geophone and,on the basis of homologous concurrent data,estimated the lowest effective frequency of conventional geophone and constructed the inverse filtering operator so as to realize low frequency recovery of conventional geophone seismic data.The practical application of B3Q shows that this technique can effectively recover the low frequency information of the conventional detector,expand the effective frequency doubling of seismic data,and improve the seismic data for solving the problem of lithology,thus having a broad application prospect.
[1] 沈野,蒋黎.利用地震高低频信息预测油气富集区[J].世界地质,2012,31(2):339-344.
[2] 谷志猛,杨海风,王军,等.岩性油气藏地震勘探若干问题讨论[J].岩性油气藏,2014,34(1):17-21.
[3] 李庆忠.实用地球物理技术在渤中探区岩性勘探中的应用[J].海洋石油,2008,20(2):1-5.
[4] 陆光辉,朱玉波,张宏,等.隐蔽圈闭识别技术发展概述[J].勘探地球物理进展,2013,35(9):79-86.
[5] 王根照,姜本厚,王富东.渤海海域新近系构造一岩性圈闭油气成藏特征与勘探方法[J].石油天然气学报,2004,27(2):40-43.
[6] 周心怀,赖维成.渤海海域隐蔽油气藏勘探关键技术及其应用效果[J].中国海上油气,2012,24(s1):11-18.
[7] 边立恩,贺振华,黄德济.储层的地震低频响应及识别[J].石油物探,2009,16(1):573-576.
[8] 管振清,郭树祥,单联瑜.利用低频信息改善地震成像质量[J].断块油气田,2008,47(6):39-41.
[9] 佘德平,吴继敏,李佩,等.利用低频信号提高膏盐区深层成像质量[J].石油物探,2006,45(3):234-238.
[10] Zhang J H,Zhang B B,Zhang Z J.Low-frequency data analysis and expansion[J].Applied Geophysics,2015,12(2):212-220.
[11] 马昭军,刘洋.地震波衰减反演研究综述[J].地球物理学进展,2005,20(4):1074-1082.
[12] Zhang Y M,Zou Z H,Zhou H W.Estimating and recovering the low-frequency signals in geophone data[J].SEG Technical Program Expanded Abstracts,2012:1-5.
[13] Zou Z H,Zhou H W,Jiang F,et al.Assessing the reliability of low frequencies in geophone records[C]//Denver:80th Annual International Meeting,SEG,Expanded Abstracts,2010:121-126.
[14] 陶知非,赵永林,马磊.低频地震勘探与低频可控震源[J].物探装备,2011,21(2):71-76.
[15] 夏颖,邓绍金,赵向东,等.地震仪器低频响应特性分析方法探讨[J].物探装备,2015,25(2):1-4.
