Objective
In course of this project the Integrated Electromagnetic Exploration Method (IEMM) shall be refined and then approved on hand of a large scale survey in a target area of hydrocarbons in Northern Germany. It is the goal to demonstrate that the new method is viable in technical and economical aspects and capable to improve the resolution in areas where the standard methods as Seismics have problems. Such typical problematic targets are complex salt structures as to be found in Netherlands, Germany, Spain, Denmark etc. Electromagnetics will give valuable additional information. The combination with seismic data improves the structural resolution.L%
See reports of the leading project TH/01116/88 for results with the passive method. The integration of active and passive method is ongoing. First results are expected by end of 1992.
The Integrated Electromagnetic Exploration Method (IEMM), which will be refined and applied in this project, combines the passive electromagnetics which uses the natural variations of the electric and magnetic field with the active electromagnetics using a transmitter to generate the EM-field variations. The combination of active and passive method improves the data quality in areas with high "cultural noise", mainly caused by load changes of the 50 Hz powerlines as to be found in the industrialized countries in Western Europe, significantly.
The IEMM measures the natural electric and magnetic field variations with several multichannel receivers (3 in this project) simulatenously at different sites in a low to medium dense raster over the target area. As a result of these measurements an impedance tensor can be calculated for each site. The frequency range of the passive EM is starting at 0.25 Hz down to appr. 0.001 Hz. In this frequency range the natural field variations are strong enough to obtain low errors inspite of cultural noise that mainly influences the higher frequency range.
This high frequency range (up to 8 KHz) which contains the information of the more shallow structures is covered with the active electromagnetics. In order to resolve these structures, a raster with a high density of measurement points is measured over the target area. As the active EM is much faster than the passive EM (typically 5-10 times) the field setup provides about 2 times more high frequency measurement sites than low frequency measurement sites.
The Integrated Electromagnetic Exploration (IEEM) is less cost-intensive than a Seismics survey. A preexploration of a possible target with the IEEM will help to reduce exploration costs. A combination of electromagnetics and seismics can give valuable additional information in areas where seismics alone cannot resolve the target as in the case of complex salt structures.
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Coordinator
38100 Braunschweig
Germany
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