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Energies 2018, 11(7), 1839; https://doi.org/10.3390/en11071839

Comparison of Detection Capability by the Controlled Source Electromagnetic Method for Hydrocarbon Exploration

1,2,3
,
1,2,3
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4,5,* and 1,2,3
1
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Ministry of Education, Changsha 410083, China
2
Hunan Key Laboratory of Nonferrous Resources and Geological Hazard Exploration, Changsha 410083, China
3
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
4
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China
5
Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan 411201, China
*
Author to whom correspondence should be addressed.
Received: 23 May 2018 / Revised: 28 June 2018 / Accepted: 3 July 2018 / Published: 13 July 2018
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Abstract

Marine controlled-source electromagnetic (CSEM) is an efficient offshore hydrocarbon exploration method that has been developed during the last 18 years. Sea Bed Logging (SBL) and towed streamer electromagnetic (TSEM) are two different data acquisition systems. We compared these two methods by using 1D sensitivity modeling and 2D Occam’s inversion. Based on this research, we tested the effect of frequency, offset range, water depth, reservoir size, and reservoir depth on the detection capability of the two acquisition methods in terms of sensitivity. In order to test the methodology clearly and simply, the geological model was extremely simplified for the inversion. The effect of these parameters on resolution was checked as another purpose. To easily evaluate our inversion results, a simple quantity was employed that we called the anomaly transverse resistance ratio. In the shallow water environment, both the SBL and the TSEM systems had a good sensitivity to the high resistivity targets. However, in the deep water environment, the SBL system had a low noise floor. Then, it could provide better detectability to the deep target. The TSEM had the advantage in terms of the horizontal resolution because of the dense in-line sampling of the electric field. View Full-Text
Keywords: Seabed Logging; towed streamer electromagnetic (EM); sensitivity; inversion; anomaly transverse resistance ratio Seabed Logging; towed streamer electromagnetic (EM); sensitivity; inversion; anomaly transverse resistance ratio
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Guo, Z.; Liu, J.; Liao, J.; Xiao, J. Comparison of Detection Capability by the Controlled Source Electromagnetic Method for Hydrocarbon Exploration. Energies 2018, 11, 1839.

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