GUO Zhenwei, DONG Hefeng, LIU Jianxin. Comparison of marine controlled-source electromagnetic data acquisition systems by a reservoir sensitivity index:analyzing the effect of water depths[J]. Acta Oceanologica Sinica, 2016, 35(11): 113-119. doi: 10.1007/s13131-016-0954-2
Citation: GUO Zhenwei, DONG Hefeng, LIU Jianxin. Comparison of marine controlled-source electromagnetic data acquisition systems by a reservoir sensitivity index:analyzing the effect of water depths[J]. Acta Oceanologica Sinica, 2016, 35(11): 113-119. doi: 10.1007/s13131-016-0954-2

Comparison of marine controlled-source electromagnetic data acquisition systems by a reservoir sensitivity index:analyzing the effect of water depths

doi: 10.1007/s13131-016-0954-2
  • Received Date: 2015-10-08
  • Rev Recd Date: 2016-05-09
  • During the past ten years, a marine controlled source electromagnetic (CSEM) method has been developed rapidly as a technology for hydrocarbon exploration. For shallow water environments, two CSEM data acquisition systems:Seabed Logging (SBL) and towed streamer electromagnetics (TSEM) have been developed in recent years. The purpose is to compare the performance of the SBL and TSEM systems at different water depths. Three different methods for the comparison are presented. The first method is a quick one dimensional sensitivity modelling. As a result, the sensitivity of marine CSEM data increases with water depth for the SBL system. Further, the sensitivity decreases with the increasing water depth for the TSEM system. The two other methods use two dimensional synthetic data from a simple 2-D isotropic model. The second method is a reservoir sensitivity index (RSI) method which has been developed to provide a quick comparison of the two systems. The RSI is calculated as the amplitude of the scattered field dividing by data uncertainty. From the calculations, it is found that with the increasing water depth RSI increases for the SBL system, while it decreases for the TSEM system. The third method uses Occam's inversion, and applies an anomaly transverse resistance (ATR) ratio for evaluating the resulting resistivity image. In shallow water environments, the resolution of the CSEM inversion results is good for both the SBL and TSEM systems. In deep water environments, the resolution of the CSEM inversion is better for the SBL system than for the TSEM system. The ATR ratios of the resistivity images show the similar conclusion. The SBL data acquisition system has an advantage in deep water environments. The TSEM system, on the other hand, is preferable for the shallow water environments.
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  • [1] Amundsen L, Løseth L, Mittet R, et al. 2006. Decomposition of electromagnetic fields into upgoing and downgoing components. Geophysics, 71(5):G211-G223
    [2] Anderson C, Mattsson J. 2010. An integrated approach to marine electromagnetic surveying using a towed streamer and source. Frist Break, 28(5):71-75
    [3] Baltar D, Roth F. 2013. Reserves estimation methods for prospect evaluation with 3D CSEM data. Frist Break, 31(6):103-111
    [4] Chen Jiuping, Alumbaugh D L. 2011. Three methods for mitigating airwaves in shallow water marine controlled-source electromagnetic data. Geophysics, 76(2):F89-F99
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    [10] Linfoot J P, Clarke C, Mattsson J, et al. 2011. Modeling and analysis of towed EM data-An example from a North Sea field trial. In:Proceedings of 73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011. SPE, Vienna, Austria. Oil and Gas Geoscience Division
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    [13] Mattsson J, Lindqvist P, Juhasz R, et al. 2012. Noise reduction and error analysis for a Towed EM System. In:SEG Technical Program Expanded Abstracts 2012. Las Vegas, Nevada:Society of Exploration Geophysicists, 1-5
    [14] Mattsson J M, Lund L L, Lima J L, et al. 2010. Case study-A towed EM test at the Peon discovery in the North Sea. In:Proceedings of 72nd EAGE Conference and Exhibition incorporating SPE EUROPEC 2010. Barcelona, Spain. Oil and Gas Geoscience Division
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Comparison of marine controlled-source electromagnetic data acquisition systems by a reservoir sensitivity index:analyzing the effect of water depths

doi: 10.1007/s13131-016-0954-2

Abstract: During the past ten years, a marine controlled source electromagnetic (CSEM) method has been developed rapidly as a technology for hydrocarbon exploration. For shallow water environments, two CSEM data acquisition systems:Seabed Logging (SBL) and towed streamer electromagnetics (TSEM) have been developed in recent years. The purpose is to compare the performance of the SBL and TSEM systems at different water depths. Three different methods for the comparison are presented. The first method is a quick one dimensional sensitivity modelling. As a result, the sensitivity of marine CSEM data increases with water depth for the SBL system. Further, the sensitivity decreases with the increasing water depth for the TSEM system. The two other methods use two dimensional synthetic data from a simple 2-D isotropic model. The second method is a reservoir sensitivity index (RSI) method which has been developed to provide a quick comparison of the two systems. The RSI is calculated as the amplitude of the scattered field dividing by data uncertainty. From the calculations, it is found that with the increasing water depth RSI increases for the SBL system, while it decreases for the TSEM system. The third method uses Occam's inversion, and applies an anomaly transverse resistance (ATR) ratio for evaluating the resulting resistivity image. In shallow water environments, the resolution of the CSEM inversion results is good for both the SBL and TSEM systems. In deep water environments, the resolution of the CSEM inversion is better for the SBL system than for the TSEM system. The ATR ratios of the resistivity images show the similar conclusion. The SBL data acquisition system has an advantage in deep water environments. The TSEM system, on the other hand, is preferable for the shallow water environments.

GUO Zhenwei, DONG Hefeng, LIU Jianxin. Comparison of marine controlled-source electromagnetic data acquisition systems by a reservoir sensitivity index:analyzing the effect of water depths[J]. Acta Oceanologica Sinica, 2016, 35(11): 113-119. doi: 10.1007/s13131-016-0954-2
Citation: GUO Zhenwei, DONG Hefeng, LIU Jianxin. Comparison of marine controlled-source electromagnetic data acquisition systems by a reservoir sensitivity index:analyzing the effect of water depths[J]. Acta Oceanologica Sinica, 2016, 35(11): 113-119. doi: 10.1007/s13131-016-0954-2
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