A 3D finite-element modelling investigation into optimal survey parameters and direct imaging for marine controlled-source electromagnetic surveys

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Title: A 3D finite-element modelling investigation into optimal survey parameters and direct imaging for marine controlled-source electromagnetic surveys
Author: Lau, Ryan
Abstract: Relatively little is known about marine controlled -source electromagnetic surveys (MCSEM ) used to detect hydrocarbon reservoirs . Typical MCSEM require the use of inversion to generate a model of the subsurface . We utilize a 3D finite -element forward model to simulate a MCSEM survey . With the results we were able to determine the strengths and weaknesses of each transmitter and receiver configuration that would best detect a shallow hydrocarbon target . Careful selection of the correct configuration is important as we have found that incorrect transmitter orientation , offset and receiver measurement component can yield misleading results . Using the ideal configuration we were able to directly image the hydrocarbon target without the use of inversion modeling . The direct image is able to show the hydrocarbon target's shape and edges without any ambiguity . The direct image of the target can potentially be used to refine 3D inversion modeling , or be used in conjunction with seismic profiles to refine seismic picks .
URI: http : / /hdl .handle .net /1969 .1 /5790
Date: 2007-09-17

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A 3D finite-element modelling investigation into optimal survey parameters and direct imaging for marine controlled-source electromagnetic surveys. Available electronically from http : / /hdl .handle .net /1969 .1 /5790 .

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