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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.40 [2011] >
IJMS Vol.40(2) [April 2011] >
| Title: | Development of EM simulator for sea bed logging applications using MATLAB |
| Authors: | Daud, Hanita
Yahya, Noorhana
Asirvadam, Vijanth |
| Keywords: | Forward modeling
Direct waves
Guided Waves
Reflected waves
Sea bed logging
Acoustic
Map |
| Issue Date: | Apr-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Present study is a 1D modeling of electromagnetic waves
for sea bed environment, developed using MATLAB software. It focuses on two
main areas; the first is on the simulator that is able to model plane layer
modeling of the sea bed environment, by setting the deep of sea water,
sediments and size and location of the hydrocarbon trap. This model shall be
used as a forward modeling of sea bed environment. The second focus is on the
effect of electromagnetic waves called direct waves, reflected waves and
refracted waves on the sea bed environment where potential hydrocarbon is
present. Present work is based on Sea Bed Logging (SBL) application that uses
marine controlled source electromagnetic (CSEM) sounding technique to detect
and characterize hydrocarbon bearing reservoirs in deep water areas. SBL uses a
mobile horizontal electric dipole (HED) source called transmitter and an array
of seafloor electric field receivers. Transmitter transmits a low frequency electromagnetic
signal from 30m-40m above the sea bed into water layer and to underneath the
sea bed. Array of the receivers will receive the signal in the form of direct
waves, air waves, reflected waves and refracted waves and is measured in the
form of amplitude and phase. These signals depend on the resistivity structure
beneath the sea bed. Hydrocarbon is known to have high resistivity value of 30–500
Ωm in contrast to sea water layer of 0.5-2 Ωm and sediments of 1-2 Ω m. These
signals were plotted to show the Electric Field amplitude versus offset (AVO)
and comparisons were made. |
| Page(s): | 267-274 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Source: | IJMS Vol.40(2) [April 2011]
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