2-D and 3-D inversions for frequency-domain helicopter-borne electromagnetic method

improving the inversion of helicopter-borne frequency-domain electromagnetic data with depth constrained

generally, the measured secondary field data is inverted into resistivity using two principal models; the homogeneous half-space model and the layered half-space model. while the homogeneous half-space inversion uses single frequency data, the inversion is done individually for each of the frequencies used, the multi-layer 1d inversion is able to take the data of all frequencies available into ...

Frequency domain 3-D electromagnetic migration and imaging of sea-bottom geoelec- trical structures

In this paper we develop a fast 3-D electromagnetic (EM) migration method for marine geophysical exploration. The developed migration algorithm is based on downward extrapolation of the observed EM field using a special form of finite-difference equation for the migration field. It allows us to migrate within the sea-bottom formations the EM signals observed by the sea-bottom receivers. The mig...

Automating Seismic Waveform Analysis For Full 3-D Waveform Inversions

Comparing Some Tools Useing Frequency Domain for the Estimation of 1-d (and 2-d) Disparity

In stereovision, the use of frequency domain methods raises the problems of the choice of a family of filters and a strategy to use it. This paper compares three families : Gabor filters, finite prolate spheroidal sequences and Weng's Windowed Fourier of Gaussian (WFG). Then a comparison between two strategies is done : an image-based choice of filters and the use of a "complete" subset of filt...

A Compact 2-D Full-Wave Finite-Difference Frequency-Domain Method for General Guided Wave Structures

A compact two-dimensional (2-D) full-wave finite-difference frequency-domain method is proposed for the analysis of dispersion characteristics of a general guided wave structure. Because the longitudinal field components are eliminated in the proposed method, only four transverse field components are involved in the final resulting eigen equation. This feature considerably reduces the required ...