Simulation of electric field response of horizontal circular electric half wave dipole antenna for seabed logging

Seabed logging (SBL) is a direct and remote application of controlled source electromagnetic (CSEM) method to detect hydrocarbon resources beneath the seafloor in offshore conditions. In this method, electromagnetic waves are used to detect the resistivity contrast between various sediment layers. T...

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Main Authors: Elsayed Dahy, Afza Shafie, Wedad R. Alharbi, Hassan Soleimani
Format: Article
Language:English
Published: Elsevier 2023-03-01
Series:Alexandria Engineering Journal
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S1110016822007517
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author Elsayed Dahy
Afza Shafie
Wedad R. Alharbi
Hassan Soleimani
author_facet Elsayed Dahy
Afza Shafie
Wedad R. Alharbi
Hassan Soleimani
author_sort Elsayed Dahy
collection DOAJ
description Seabed logging (SBL) is a direct and remote application of controlled source electromagnetic (CSEM) method to detect hydrocarbon resources beneath the seafloor in offshore conditions. In this method, electromagnetic waves are used to detect the resistivity contrast between various sediment layers. The current source of electromagnetic waves is a horizontal electric dipole (HED) antenna. The antenna design represents a challenge in shallow waters (less than500 m seawater depth) due to the presence of airwaves that lead to a low signal-to-noise ratio, hence hindering the detection of a hydrocarbon reservoir. A horizontal circular electric half-wave dipole will be used in this work as the source of electromagnetic waves. The numerical solution for the electric field response will be developed based on solving the Maxwell equations in two modes: the poloidal and toroidal modes. Simulation results have shown that the new antenna is able to detect the presence of deep hydrocarbon reservoirs (up to 5000 m) in shallow-water environment. Comparison of the average percentage difference in delineation between the circular and the HED was carried out. The new antenna results in 61 % delineation compared to 15 % for the HED at 5000 m hydrocarbon depth and 200 m seawater depth, indicating the ability of the antenna to disperse the airwaves. The results also show that the airwaves are significantly reduced from nearly 15000 m (for the HED) to 10000 m offset for the proposed antenna, hence increasing the signal-to-noise ratio. These results seem to indicate the potential for the new antenna to be used as an EM source for SBL in shallow-water environment.
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spelling doaj.art-80ac980df4e74e69ac4c568cb4d31aab2023-03-01T04:31:00ZengElsevierAlexandria Engineering Journal1110-01682023-03-0166421431Simulation of electric field response of horizontal circular electric half wave dipole antenna for seabed loggingElsayed Dahy0Afza Shafie1Wedad R. Alharbi2Hassan Soleimani3Department of Mathematics, Faculty of Science, Al-Azhar University, Assuit 71524, Egypt; Corresponding author.Fundamental and Applied Sciences Department, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, MalaysiaPhysics Department, College of Science, University of Jeddah, Jeddah 23890, Saudi ArabiaGeoscience Department, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, MalaysiaSeabed logging (SBL) is a direct and remote application of controlled source electromagnetic (CSEM) method to detect hydrocarbon resources beneath the seafloor in offshore conditions. In this method, electromagnetic waves are used to detect the resistivity contrast between various sediment layers. The current source of electromagnetic waves is a horizontal electric dipole (HED) antenna. The antenna design represents a challenge in shallow waters (less than500 m seawater depth) due to the presence of airwaves that lead to a low signal-to-noise ratio, hence hindering the detection of a hydrocarbon reservoir. A horizontal circular electric half-wave dipole will be used in this work as the source of electromagnetic waves. The numerical solution for the electric field response will be developed based on solving the Maxwell equations in two modes: the poloidal and toroidal modes. Simulation results have shown that the new antenna is able to detect the presence of deep hydrocarbon reservoirs (up to 5000 m) in shallow-water environment. Comparison of the average percentage difference in delineation between the circular and the HED was carried out. The new antenna results in 61 % delineation compared to 15 % for the HED at 5000 m hydrocarbon depth and 200 m seawater depth, indicating the ability of the antenna to disperse the airwaves. The results also show that the airwaves are significantly reduced from nearly 15000 m (for the HED) to 10000 m offset for the proposed antenna, hence increasing the signal-to-noise ratio. These results seem to indicate the potential for the new antenna to be used as an EM source for SBL in shallow-water environment.http://www.sciencedirect.com/science/article/pii/S1110016822007517Control source electromagneticHydrocarbon reservoirsHorizontal antennaAirwavesShallow water
spellingShingle Elsayed Dahy
Afza Shafie
Wedad R. Alharbi
Hassan Soleimani
Simulation of electric field response of horizontal circular electric half wave dipole antenna for seabed logging
Alexandria Engineering Journal
Control source electromagnetic
Hydrocarbon reservoirs
Horizontal antenna
Airwaves
Shallow water
title Simulation of electric field response of horizontal circular electric half wave dipole antenna for seabed logging
title_full Simulation of electric field response of horizontal circular electric half wave dipole antenna for seabed logging
title_fullStr Simulation of electric field response of horizontal circular electric half wave dipole antenna for seabed logging
title_full_unstemmed Simulation of electric field response of horizontal circular electric half wave dipole antenna for seabed logging
title_short Simulation of electric field response of horizontal circular electric half wave dipole antenna for seabed logging
title_sort simulation of electric field response of horizontal circular electric half wave dipole antenna for seabed logging
topic Control source electromagnetic
Hydrocarbon reservoirs
Horizontal antenna
Airwaves
Shallow water
url http://www.sciencedirect.com/science/article/pii/S1110016822007517
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