Transient electromagnetic survey in shallow water

摘要：

In shallow water environments, the frequency domain, marine controlled source electromagnetic (CSEM) method faces a big challenge for detecting thin hydrocarbon reservoir because the airwave dominates electromagnetic responses. In this contribution, airwave effects on transient CSEM fields are investigated. According to our numerical results, the airwave arrives earlier in shallow water and later in deep water environments and can be easily separated from signals traveling through the deep resistor. Although in an intermediate water depth (around 500 m) the airwave and the signal from the deep resistivity layer overlap each other and both signals are not clearly separated, one can still see a clear anomaly compared to the background model without hydrocarbon reservoirs. Our works suggest that airwave effects are weaker in the time domain CSEM method than in the frequency domain one.

关键词： transient CSEM airwave shallow water

作者: LI Yuguo Steven CONSTABLE

作者单位: Scripps Institution of Oceanography, University of California San Diego, La Jolla, USA.

会议类型: 国际会议

会议名称: The 19th International Workshop on Electromagnetic Induction in the Earth(第十九届国际地球电磁感应学术研讨会)

会议地点: 北京

会议语种:英文

页码: 757-760

在线出版日期: 2008-10-23（万方平台首次上网日期，不代表论文的发表时间）