大地电磁测深电磁波反射函数延拓成像法
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摘要
本文提出了一种新的实现简单、要求条件少、成像精度较高的大地电磁测深波动方程延拓成像法——大地电磁测深电磁波反射函数延拓成像法 ,简称 IRC法。首先介绍一维介质情况下的 IRC理论 ,导出大地电磁测深电磁波反射函数 ,此函数由电磁波上行波与下行波的比值表示 ;然后具体给出大地电磁测深电磁波反射函数延拓成像法的实施特点和步骤 ;最后用该方法和拟地震解释法 [1 ] 对模型及井旁实测资料同时进行了计算 ,说明了该方法的可行性、实用性。此法不仅能使界面正确成像 ,而且能求出真电阻率等参数 ,不受上界面的影响。
The paper presented a new imaging method of wave-equation continuation for MT-imaging by electromagnetic reflection function continuation for MT characterized by simple practice,few acquired conditions and high-precious imaging,simply called as IRC.First the paper introduce the IRC theory in 1-D medium,deduced electromagnetic reflection function of MT that represented by ratio between upgoing and downgoing electromagnetic waves;then the operational feature and steps of imaging method of reflection function continuation for MT are given;finally using the method and pseudo-seismic interpretation method to compute the model and real data near borehole in order to expound the feasibility and practice of the method.The method not only makes interface correct imaging,but also computes such parameters as true impedance etc,not affected by upper interfaces.
The paper presented a new imaging method of wave-equation continuation for MT-imaging by electromagnetic reflection function continuation for MT characterized by simple practice,few acquired conditions and high-precious imaging,simply called as IRC.First the paper introduce the IRC theory in 1-D medium,deduced electromagnetic reflection function of MT that represented by ratio between upgoing and downgoing electromagnetic waves;then the operational feature and steps of imaging method of reflection function continuation for MT are given;finally using the method and pseudo-seismic interpretation method to compute the model and real data near borehole in order to expound the feasibility and practice of the method.The method not only makes interface correct imaging,but also computes such parameters as true impedance etc,not affected by upper interfaces.
引文
[1] 陈乐寿,石应骏,王光锷合著.大地电磁测深法教程.北京:地震出版社,1985
[2] 王家映著.大地电磁拟地震解释法.北京:石油工业出版社,1995
[3] 侯德金.大地电磁测深电磁波反射函数延拓成像法研究.中国地质大学研究生院硕士毕业论文,2000
[4] GazdagJandSguazzeroP.Migration of seismic databy phase shift plus interpolation.Geophysics,1984,49(2)
[2] 王家映著.大地电磁拟地震解释法.北京:石油工业出版社,1995
[3] 侯德金.大地电磁测深电磁波反射函数延拓成像法研究.中国地质大学研究生院硕士毕业论文,2000
[4] GazdagJandSguazzeroP.Migration of seismic databy phase shift plus interpolation.Geophysics,1984,49(2)
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