摘要
提出一种基于逐次逼近解法的选代反演算法，对并间地层电导率的构造进行成像．该方法用一阶Ｂｏｒｎ近似将积分方程线性化，得到对电导率分布的初始估计，在选代反演中用高阶Ｂｏｒｎ近似对井间地层电导率构造进行更精确的估计．应用该方法还可以对井间电子率分布进行二次成像，从而使成像分辨率更为准确．数值计算结果表明，这种迭代反演算法与基于Ｂｏｒｎ近似、二阶Ｂｏｒｎ近似和扩展Ｂｏｒｎ近似的反演算法相比提高了成像分辨率，且计算效率相当．
An iterative inversion method based on SAM(Successive Approximation Method)is developed to image the Earth's conductivity statUre between tWo boreholes. Themethod employs the first Born approximation to linearize the integral equationformulation, and an initial estimate of the conductivity is obtained. A higher-orderBorn approximation is aPPlied in an iterative manner to achieve better estimates of thestature. The method can also be applied to re-image the Earth's conductivity stature,and the resolution is much better. NUmerical results indicate that the iterative inversionmethod improves resolution compared with other inversion methods based on Bornapproximation or second Born approximation or extended Born approximation, and hasthe same computational efficiency.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第5期711-719,共9页
Chinese Journal of Geophysics
关键词
井间电磁成像
迭代反演算法
Born近似
磁测井
Crosswell electromagnetic imaging, Iterative inversion algorithm,Born approximation, Pixel.
