Guided and Direct Wave Evaluation of Controlled Source Electromagnetic Survey Using Finite Element Method
- 1 Fundamental and Applied Sciences Department, Bandar Seri Iskandar, Tronoh, Malaysia
- 2 Electrical and Electronic Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh, Malaysia
- 3 Electrical and Electronic Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh, Malaysia
- 4 Electrical and Electronic Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh, Malaysia
- 5 Fundamental and Applied Sciences Department, Bandar Seri Iskandar, Tronoh, Malaysia
- 6 Fundamental and Applied Sciences Department, Bandar Seri Iskandar, Tronoh, Malaysia
Abstract
Deep target hydrocarbon detection is still challenging and expensive. Direct hydrocarbon indicators (DHIs) in seismic data do not correspond to economical hydrocarbon exploration. Due to unreliability in seismic data for the detection of DHIs, new methods have been investigated. Marine controlled source electromagnet (MCSEM) or Sea bed logging (SBL) is new method for the detection of deep target hydrocarbon reservoir. Sea bed logging has also the potential to reduce the risks of DHIs in deep sea environment. Modelling of real sea environment helps to reduce the further risks before drilling the oil wells. 3D electromagnetic (EM) modelling of seabed logging requires more accurate methods for the detection of hydrocarbon reservoir. Finite element method (FEM) is chosen for the modelling of seabed logging to get more precise EM response from hydrocarbon reservoir below 4000 m from seabed. FEM allows to investigate the total electric and magnetic fields instead of scattered electric and magnetic fields, which shows accurate and precise resistivity contrast below the seabed. From the modelling results, It was investigated that Hz field shows higher magni- tude with 342% than the Ex field. It was observed that 0.125 Hz frequency can be able to show better resistivity contrast of Hz field (31.30%) and Ex field (16.49%) at target depth of 1000 m below seafloor for our proposed model. Hz and Ex field delineation was found to decrease as target depth increased from 1000 m to 4000 m. At the target depth of 4000 m, no field delineation response was seen from the current electromagnetic (EM) antenna used by the industry. New EM antenna has been used to see the EM response for deep target hydrocarbon detection. It was investigated that novel EM antenna shows better delineation at 4000 m target depth for Ex and Hz field up to 10.3% and 15.1% respectively. Novel EM antenna also shows better Hz phase response (128.4%) than the Ex phase response (38.3%) at the target depth of 4000 m below the seafloor.
- S. Ellingsrud, T. Eidesmo and S. Johansen, “Remote Sensing of Hydrocarbon Layers by Seabed Logging (SBL): Results from a Cruise Offshore Angola,” The Leading Edge, Vol. 21, No. 10, 2002, pp. 972-982. doi:10.1190/1.1518433
- F. N. Kong, H. Weterdahl, S. Ellingsrud, T. Eidesmo and S. Johansen, “Seabed Logging: A Possible Direct Hydro- carbon Indicator for Deepsea Prospects Using EM Energy,” Oil and Gas Journal, Vol. 100, No. 19, 2002, pp. 30-38.
- M. N. Akhtar, N. Yahya, H. Daud, A. Shafie, H. M. Zaid, M. Kashif and N. Nasir, “Development of EM Wave Guide Amplifier Potentially Used for Sea Bed Logging,” Journal of Applied Science, Vol. 11, No. 7, 2011, pp. 1361-1365. doi:10.3923/jas.2011.1361.1365
- N. Nasir, N. Yahya, M. N. Akhtar, M. Kashif, A. Shafie, H. Daud and H. M. Zaid, “Magnitude Versus Offset Study with EM Transmitter in Different Resistive Medium,” Journal of Applied Science, Vol. 11, No. 7, 2011, pp. 1309-1314. doi:10.3923/jas.2011.1309.1314
- F. N. Kong, H. Westerdahl and F. Antonsen, “Excitation of a Long Wire Antenna-Antennas from 200 MHz to 1 Hz,” Tenth International Conference on Ground Penetrating Radar, Delft, 21-24 June 2004, pp. 137-140.
- N. Yahya and T. Zhu, “Development of Y3Fe5O12 Nano- Magnetic Feeder for Em Source of an Intelligent Horizontal Twin Dipoles,” American institute of Physics, Vol. 1136, 2009, pp. 269-276.
- M. N. Akhtar, N. Yahya and N. Nasir, “Novel EM Antenna Based on Y3Fe5O12 Magnetic Feeders for Improved MVO,” Electronics, Communications and Photonics Conference, 2011 Saudi International, 24-26 April 2011, pp. 1-6.
- N. Yahya, M. N. Akhtar, N. Nasir, A. Shafie, M. S. Jabeli and K. Koziol, “CNT Fibres/Aluminium-NiZnFe2O4 Based EM Transmitter for Improved Magnitude vs Offset (MVO) in a Scaled Marine Environment,” Journal of Nanoscience and Nanotechonology, Vol. 11, No. 7, 2011, pp. 1-7.
- M. N. Akhtar, N. Yahya, K. Koziol and N. Nasir, “Synthesis and Characterizations of Ni0.8Zn0.2Fe2O4- MWCNTs Composites for Their Application in Sea Bed Logging,” Ceramics International, Vol. 37, No. 8, 2011, pp. 3237-3245. doi:10.1016/j.ceramint.2011.05.113
- N. O. Sadiku, “Numerical Methods in Electromagnetics,” 2nd Edition, Mathew, Boca Raton, London, New York, Washington DC, 2001.
- M. Deng, W. B. Wei, W. B. Zhang, Y. Sheng, Y. J. Li and M. Wang, “Electric Field Responses of Different Gas Hydrate Models Excited by a Horizontal Electric Dipole Source with Changing Arrangements,” Petroleum Explora- tion & Development, Vol. 37, No. 4, 2010, pp. 438-442.