Geologists at Moscow State University have developed a method to study terrain with complex terrain and create its 3D model using magnetic exploration. This was reported by the press service of Moscow State University.
Seismographs provide information about the internal structure of land areas and are the main tool for studying layered sections. However, this method is almost powerless in regions with a large number of tectonic disturbances and complex structures – in such cases it is almost impossible to accurately interpret the resulting echo pattern. A team of authors from Moscow State University decided to take a three-dimensional plan of one of the sections of the Pechora Sea, which is promising in terms of developing an oil and gas field. To do this, they supplemented seismic surveys with magnetic surveys to determine the depth of the proposed magnetic layer in seismically quiet areas of the section.
To solve this problem, geologists developed and implemented a three-dimensional seismomagnetic modeling method. The technique includes three main stages: the selection of the parameters of the initial approximation of the magnetically active layer, the interactive two-dimensional selection of the upper and lower position of the magnetically active layer, taking into account the known parts of the seismic morphology, constraints along the individual profiles, and finally, the three-dimensional selection – the selection of the magnetization distribution in the layer and the shape. improvement.
After 3D seismomagnetic modeling, geological and geophysical analyzes were made. It provided two important geological results that changed the basic geological concept.
As a result, the authors managed to make two discoveries. First, there is a sedimentary layer formed during a volcanic eruption in the Permian-Lower Triassic thickness. Second, the hypothesis was disproved as the magnetic anomalies of the region were produced by the dyke complex.
The authors hope that their method will aid geological research and allow to explore the interior of the earth in greater detail.
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