A new formula to compute apparent resistivities from marine magnetometric resistivity data

  • Chen J
  • Oldenburg D
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Magnetometric resistivity MMR is an electromagnetic EM exploration method that has been used successfully to investigate electrical-resistivity structures below the sea- floor. Apparent resistivity, derived from the observed azi- muthal component of the magnetic field, often is used as an approximation to the resistivity of a layered earth. Two commonly used formulas to compute the apparent resistiv- ity have their own limitations and are invalid for a deep-sea experiment. In this paper, we derive an apparent-resistivity formula based upon the magnetic field resulting from a semi-infinite electrode buried in a 1D layered earth. This new formula can be applied to both shallow and deep ma- rine MMR surveys. In addition, we address the effects that arise from the transmitter-receiver Tx-Rx depth difference and the choice of the normalized range the radial distance between transmitter and receiver, divided by the thickness of seawater on data interpretation and survey design. The performance of the new formula is shown by processing synthetic and field data

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  • Jiuping Chen

  • Douglas W. Oldenburg

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