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Abstract

We present results from a technology demonstration survey over the Břyla discovery in the North Sea illustrating the improved target detectability and imaging of a high-power deck-mounted CSEM source. The deck-mounted power electronics and control system drive a surface-towed horizontal electric dipole with a dipole moment of 2,160 kAm, which is about six times higher than the dipole moment of a conventional deep water source. New switching and signal modulation technologies in combination with precision sensors generate waveforms with no zero crossing wait states and improved calibration accuracy, making the source well suited for advanced processing requiring high SNR and fidelity such as frequency differencing. The Břyla discovery is located at a depth of ~2,040 m in 120 m deep water and represents a challenging target for CSEM due to its relatively small volume and low resistivity contrast. Two wide-azimuth 3D datasets were acquired over the discovery: first with the high-power deck-mounted source and then with a surface-towed conventional source. Inversion comparisons demonstrate that Břyla is only imaged reliably with the high-power deck-mounted source in combination with frequency differencing. Furthermore, the data of the high-power deck-mounted source suggests the existence of an additional resistor in accordance with existing play models.

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/content/papers/10.3997/2214-4609.20130481
2013-06-10
2024-03-28
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20130481
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