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:           ,            .  , 1               .                   ,             .      .     (grid search)      .    1            . ,          .      2              . :  ,  ,  , Abstract: The sea layer in marine Controlled-Source Electromagnetic (mCSEM) survey changes the conventionaldefinition of apparent resistivity which is used in the land CSEM survey. Thus, the development of a new algorithm,which computes apparent resistivity for mCSEM survey, can be an initiative of mCSEM data interpretation. First, wecompared and analyzed electromagnetic responses of the 1D stratified gas hydrate model and the half-space model belowthe sea layer. Amplitude and phase components showed proper results for computing apparent resistivity than real andimaginary components. Next, the amplitude component is more sensitive to the subsurface resistivity than the phasecomponent in far offset range and vice versa. We suggested the induction number as a selection criteria of amplitudeor phase component to calculate apparent resistivity. Based on our study, we have developed a numerical algorithm, whichcomputes appropriate apparent resistivity corresponding to measured mCSEM data using grid search method. In addition,we verified the validity of the developed algorithm by applying it to the stratified gas hydrate models with various modelparameters. Finally, by constructing apparent resistivity pseudo-section from the mCSEM responses with 2D numericalmodels simulating gas hydrate deposits in the Ulleung Basin, we confirmed that the apparent resistivity can provide theinformation on the geometric distribution of the gas hydrate deposit.Keywords: mCSEM, apparent resistivity, gas hydrate, geometrical distribution

Computation of Apparent Resistivity from Marine Controlled-source Electromagnetic Data for Identifying the Geometric Distribution of Gas Hydrate