Comparações de dados sintéticos mCSEM 2.5-D e 3-D

The marine Controlled Source Electromagnetic is new geophysical method for detection of oil-filled reservoirs in deep-water areas. The method maps the contrast of electrical resistivity between the reservoir and the host sedimentary layers. In this paper, using the integral equation method (INTEM3D software) we modelled the mCSEM method in the presence of a 3-D structure with fixed length and variable width. The responses achieved were shown as anomalies of normalized electric field amplitudes. According with the results, the amplitudes do not change if the width of the heterogeneity is equal or higher than its length. In this case, we compared the results of the 3-D modelling with 2.5-D ones, were we used the finite element method (eGs software) to compute the mCSEM response, and we conclude the computationally less expensive 2.5-D modelling can be used perfectly, without loss of information.