Journal of Mining Engineering

Journal of Mining Engineering

Audio-Magnetotelluric exploration of an aquifer structure in the Mond River basin, Bushehr province

Document Type : research - paper

Authors
1 M.Sc. student, Institute of Geophysics, University of Tehran, Tehran, Iran
2 Assistant Professor, Institute of Geophysics, University of Tehran, Tehran, Iran
Abstract
The main purpose of this research is to analyze and model the audio-magnetotelluric (AMT) data to study the regional structure and deep groundwater of the Sena- the Shonbe aquifer system in central Zagros. We used challenging methods to determine the dimensionality of the regional structure, evaluate the degree of inherent distortion caused by small-scale, near-surface inhomogeneities, quantify these effects and remove them from MT measurements, and retrieve the main features of the regional geoelectric structure (e.g., its strike direction). Data were collected at 19 stations along the profile in the southeast of the folded belt (SFB) of the Zagros folded belt. First, the regional subsurface structure was classified using impedance and MT tensors rotational invariants (Bahr and WAL invariants). Then, the phase tensor method was used to estimate the strike direction of the regional geo-electric structure. The results of Bahr and WAL invariants confirm regional 1D and 2D structures with local galvanic distortion at most periods. Rotating the data into the strike direction of the regional structure, isotropic two-dimensional inversions of the different polarizations of the impedance data and tipper vectors were performed. The computer program used for this purpose uses the nonlinear conjugate gradient (NLCG) algorithm to minimize the cost function, which consists of data misfit and model roughness. Several numerical tests were performed to determine the optimal values of the parameters regulating this algorithm: τ, α, β, and H/V ratio. Finally, interpretations related to the resulting electrical resistivity cross-section are provided.
Keywords
Subjects

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Volume 18, Issue 61
Winter 2024
Pages 53-70

  • Receive Date 20 October 2022
  • Revise Date 27 November 2023
  • Accept Date 26 December 2023