This paper describes a study of the interpretation of controlled-source electromagnetic (CSEM) data obtained from iron ores under rough topography. For the accurate interpretation of the data, we considered two characteristics that affect the CSEM data; one is rough topography and the other is an ...
Controlled Source Electromagnetics (CSEM) is a marine geophysical method mapping the subsurface resistivity. A horizontal electric dipole source (HED) is towed across a grid or line of seabed receivers while emitting an electromagnetic field, with a predefined frequency content. The EM signal propagate...
Controlled source electromagnetic (EM) methods represent a unique set of geophysical experiments which can be used to determine the properties and state of the deep continental crust. Unlike natural source EM methods, an artificial EM source technique can be designed to optimize resolution and minimize...
We implemented an edge-based finite element time domain (FETD) modeling algorithm for simulating controlled-source electromagnetic (CSEM) data. The modeling domain is discretized using unstructured tetrahedral mesh and we consider a finite difference discretization of time using the backward Euler method ...
5) main drive-source electromagnetic method 主动源电磁法6) CSEM 可控源电磁法 1. We discuss the feasibility of using controlled-source electromagnetic(CSEM) in the frequency domain for prospecting marine gas hydrates. 本文介绍了利用可控源电磁法探测海洋天然气水合物的可行性,在参考了大洋钻探计划(...
Three dimensional inversion of Marine Controlled Source Electromagnetic data (MCSEM) data is complex. Achieving an acceptable outcome in a reasonable time frame requires considerable manual input to the problem. We proposed a methodology for preconditioning the inversion for integral equation approximated ...
The method for correcting the phase of measured electric signals or magnetic signals of field data from a controlled source electromagnetic survey (CSES) by comparing the measured field data corresponding to a selected frequency to the simulated data for various signal source receiver offsets () and...
Interpretation of marine controlled source electromagnetic data is potentially influenced by bathymetry. Electromagnetic field strength and direction can be affected by small changes in water column depth. The propagation of electromagnetic fields in complex 3D geo-clcctrical setting cannot be understood by...
Method for separating responses of multiple transmitters m a controlled source electromagnetic survey by using mutually orthogonal transmitter waveforms and transforming the combined response to the frequency domain ( 144 ) The mutual orthogonality can be based disjoint frequency spectra or on phase ...
Zablocki, C JJackson, D.B., Kauahikaua, J., and Zablocki, C.J., 1981, Resistivity monitoring of an active volcano: application of the controlled source electromagnetic technique at Kilauea volcano, Hawaii: EOS, vol. 62, p. 1O72....