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oa Marine Transient EM Surveys
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE Workshop on Marine Seismic - Focus on Middle East and North Africa, Feb 2009, cp-119-00027
- ISBN: 978-94-6282-068-5
Abstract
We describe transient electromagnetic (EM) surveys in water depths of about 100 m, where conventional Controlled Source EM (CSEM) has great problems with the air wave. Our proprietary method recovers the complete Earth impulse response, optimising signal strength with offset-dependent coded signals. Air wave removal is straightforward and our new method for removing magnetotelluric (MT) noise increases the low-frequency signal-to-noise ratio by about 20 dB. We demonstrate the techniques on real data from the North Sea.