Abstract:

The direct current resistivity method, as one of the important methods in geophysical exploration, has played a significant role in various geological exploration fields. This paper conducts a study on the electrical response characteristics of intrusive rock models using a three-dimensional direct current numerical algorithm based on space-wavenumber hybrid domain. The total electric field normalization coefficient T₃ is introduced, and the electric field response characteristics of pole-dipole array and dipole-dipole array configuration of non-mineralized and mineralized intrusive rock models are comparatively analyzed. Special consideration is given to the effects of isotropic and anisotropic mineralization zones, as well as the induced polarization effect, in order to reveal the response differences under different electrical conditions. The analysis results show that the total electric field normalization coefficient has a more pronounced response to the underground medium than electric field components. The T₃ response anomaly detected by dipole-dipole array is superior to that of pole-dipole array, and different electrical mineralized zones exhibit significant differences in T₃ response features. Compared to polarizability anisotropy, resistivity anisotropy has a more profound impact on the observation results. The response characteristics of the mineralized model are far more complex than those of the non-mineralized model, especially when the mineralized zone is electrically anisotropic, the observed T₃ morphology of different electrical parameters is quite different.

Key words: intrusive rock')">

intrusive rock, direct current resistivity method, algorithm of space-wavenumber hybrid domain, electrical properties, geophysical exploration