METHOD FOR GEOPHYSICAL EXPLORATION Russian patent published in 2021 - IPC G01V1/00 

FIELD: geophysics.

SUBSTANCE: invention relates to the field of geophysics. The method for geophysical exploration is based on the registration of seismic vibrations and potential geophysical fields. The method is intended mainly for carrying out work by methods of seismic exploration and gravimetric exploration. It includes attenuation of noises that are not of exploration interest. To do this, it is proposed to register seismic or potential fields after the locations of the geophysical profiles where the noise level is minimal are determined. The source of such noise can be microseisms, as well as resonant vibrations excited by different inhomogeneities located in the near-surface zone of the geological section. Interference attenuation can be achieved by pre-recording the noise level at reception points located on a two-dimensional observation system. At the processing stage, the locations of isolines characterized by the minimum noise level are found on the noise intensity maps. Along these isolines, sections of profiles are placed, along which repeated geophysical observations are carried out. Another, alternative, way, proposed in one of the embodiments of the invention, is that according to a well-known three-dimensional mathematical model of the upper part of the section, their own vertical oscillations are calculated, the locations of the node lines and the antinodes of the oscillations are traced, and fragments of profiles are placed for geophysical observations along the node lines that differ in the minimum noise level. The method can be implemented in a modification of passive seismic exploration without exciting seismic vibrations, as well as in a modification of active seismic exploration, when the receivers and sources of vibrations are installed on the same profiles, characterized by a minimum noise level. To implement the method in production, the use of existing technical means is proposed.

EFFECT: improving the quality of the obtained geophysical data by making a reasonable choice of the configuration and location of the geophysical profiles, as well as conducting geophysical observations along the profiles characterized by a minimum noise level.

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