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- W1998059512 abstract "A frequency-domain, marine controlled-source electromagnetic (CSEM) method has been applied successfully in deep water areas for detecting hydrocarbon (HC) reservoirs. However, a typical technique with horizontal transmitters and receivers requires large source–receiver separations with respect to the target depth. A time-domain EM system with vertical transmitters and receivers can be an alternative because vertical electric fields are sensitive to deep resistive layers. In this paper, a time-domain modelling code, with multiple source and receiver dipoles that are finite in length, has been written to investigate transient EM problems. With the use of this code, we calculate step-off responses for one-dimensional HC reservoir models. Although the vertical electric field has much smaller amplitude of signal than the horizontal field, vertical currents resulting from a vertical transmitter are sensitive to resistive layers. The modelling shows a significant difference between step-off responses of HC- and water-filled reservoirs, and the contrast can be recognized at late times at relatively short offsets. A maximum contrast occurs at more than 4 s, being delayed with the depth of the HC layer." @default.
- W1998059512 created "2016-06-24" @default.
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- W1998059512 date "2013-03-05" @default.
- W1998059512 modified "2023-10-18" @default.
- W1998059512 title "Step-off, vertical electromagnetic responses of a deep resistivity layer buried in marine sediments" @default.
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- W1998059512 doi "https://doi.org/10.1088/1742-2132/10/2/025011" @default.
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