海陆联测的大地电磁数据处理与综合解释
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摘要
结合研究区雷州半岛的实际地质情况,通过在陆上布置磁道,近岸的浅海—潮间带海水中布置电道,实现了海陆电场和磁场分离同步采集的大地电磁勘探,填补了海陆地震空白带.通过建立针对性的地电模型,利用正演模拟方法校正了海水对陆地测点的畸变效应影响,并通过大地电磁二维反演以及重力和磁力数据的正反演计算,进行了综合地质地球物理解释,证明了海陆联测数据的采集、处理和解释效果.
In accordance with the practical geological situation of the studied area in Leizhou peninsula,the land-sea synchronous magnetotelluric observation was fulfilled by using separated electrical channels in the neritic zone and magnetic channels on the nearby land,which fills the blank of seismic(prospecting) in the neritic zones and the land between them.The distortion effects on the land magnetotell-uric sounding(MT) sites resulted from the sea-water were also corrected by using forward modeling methods based on the typical geo-electrical model.Integrated geological and geophysical interpretation was proposed on the basis of 2-D MT inversion and gravity & magnetic inversion results,which proves fruitful the collecting,processing and interpretation of the land-sea synchronously observed MT data.
In accordance with the practical geological situation of the studied area in Leizhou peninsula,the land-sea synchronous magnetotelluric observation was fulfilled by using separated electrical channels in the neritic zone and magnetic channels on the nearby land,which fills the blank of seismic(prospecting) in the neritic zones and the land between them.The distortion effects on the land magnetotell-uric sounding(MT) sites resulted from the sea-water were also corrected by using forward modeling methods based on the typical geo-electrical model.Integrated geological and geophysical interpretation was proposed on the basis of 2-D MT inversion and gravity & magnetic inversion results,which proves fruitful the collecting,processing and interpretation of the land-sea synchronously observed MT data.
引文
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[9]杨辉,王家林,吴健生,等.大地电磁与地震资料仿真退火约束联合反演[J].地球物理学报,2002,45(5):723.YANG Hui,WANG Jialin,WU Jiansheng,et al.Constrainedjoint inversion of magnetotelluric and seismic data using simulatedannealing algorithm[J].Chinese Journal of Geophysics,2002,45(5):723.
[2]柳建新,毛先成,张友山.水中大地电磁法混同深[J].物探与化探,1997,21(1):74.LIU Jianxin,MAO Xiancheng,ZHANG Youshan.Underwatermagnetotelluric sounding method[J].Geophysical&GeochemicalExploration,1997,21(1):74.
[3]王东坡,曾效箴,薛林福,等.海洋阵列大地电磁测深法在辽东湾滩海深部地质构造研究中的应用[J].石油与天然气地质,2000,21(4):293.WANG Dongpo,ZENG Xiaozhen,XUE Linfu,et al.Oceanic ar-ray magnetotelluric sounding used in study of deep structures inbeach sea of Liaodong Bay[J].Oil&Gas Geology,2000,21(4):293.
[4]陈乐寿,王光锷.大地电磁测深法[M].北京:地质出版社,1990.CHEN Leshou,WANG Guang’e.Magnetotelluric sounding[M].Beijing:Geological Publishing House,1990.
[5]张全胜,王家映,叶景艳,等.雷琼地区滩海MT勘探可行性试验研究[J].地质与勘探,2006,42(1):64.ZHANG Quansheng,WANG Jiaying,YE Jingyan,et al.A fea-sibility test of offshore magnetotelluric prospecting in the Leiqiongarea[J].Geology and Prospecting,2006,42(1):64.
[6]王家林,吴健生,于鹏,等.徐闻-纪家高精度重力和MT测量综合研究报告[R].上海:同济大学海洋与地球科学学院地球物理系,2004.WANG Jialin,WU Jiansheng,YU Peng,et al.Integrated stud-ies of high resolution gravity and MT data in Xuwen-Jijia area[R].Shanghai:Department of Geophysics,School of Marine&Earth Science,Tongji University,2004.
[7]杨文采,方慧,程振炎,等.苏鲁超高压变质带北部地球物理调查(Ⅱ):非地震方法[J].地球物理学报,1999,42(4):508.YANG Wencai,FANG Hui,CHENG Zhenyan,et al.Geophysi-cal investigation of northern Sulu UHPM terrane in east China(Ⅱ):non-seismic methods[J].Chinese Journal of Geophysics,1999,42(4):508.
[8]张晓辉,于鹏.大地电磁剥皮法反演[D].上海:同济大学海洋与地球科学学院地球物理系,2003.ZHANG Xiaohui,YU Peng.Stripping inversion method of mag-netotelluric data[D].Shanghai:Department of Geophysics,School of Marine&Earth Science,Tongji University,2003.
[9]杨辉,王家林,吴健生,等.大地电磁与地震资料仿真退火约束联合反演[J].地球物理学报,2002,45(5):723.YANG Hui,WANG Jialin,WU Jiansheng,et al.Constrainedjoint inversion of magnetotelluric and seismic data using simulatedannealing algorithm[J].Chinese Journal of Geophysics,2002,45(5):723.
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