The Controlled Source Electro‐Magnetic (CSEM) Method in shallow water: a calibration survey

Darnet, Mathieu; Sman, P. van der; Hindriks, Folkert; Sandrin, Alessandro; Christian, Philip; Jensen, Line; Uldall, A.

doi:10.1190/1.3513880

Cited by 7 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Darnet et al (2010)). The rise in the commercial use of CSEM coincides with exploration moving into water over 1 km deep and the much greater cost of drilling which makes the use of CSEM attractive (Constable, 2010).…”

Section: Introductionmentioning

confidence: 93%

Quantifying the effect of the air/water interface in marine active source EM

Wright

2015

Journal of Applied Geophysics

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 93%

Quantifying the effect of the air/water interface in marine active source EM

Wright

2015

Journal of Applied Geophysics

View full text Add to dashboard Cite

“…Conventional CSEM (Eidismo et al 2002; Ellingsrud et al 2002; Edwards 2005; Constable and Srnka 2007) has been used mainly in deep water (deeper than 500 m) but in the last few years it has been used in shallower water (e.g., Darnet et al 2010). Conventional CSEM employs a continuous signal emitted by a horizontal electric dipole source towed about 50 m above the sea floor and receiver nodes on the sea floor, which measure both orthogonal horizontal electric field components and three orthogonal magnetic field components.…”

Section: Introductionmentioning

confidence: 99%

Comparison of pseudo‐random binary sequence and square‐wave transient controlled‐source electromagnetic data over the Peon gas discovery, Norway

Ziolkowski

Wright

Mattsson

2011

Geophysical Prospecting

View full text Add to dashboard Cite

A B S T R A C TWe discuss the problem of source control in controlled-source electromagnetic (CSEM) surveying and compare and contrast equal energy transient square-wave and transient pseudo-random binary sequence source signatures for the same towedstreamer electromagnetic survey line over the Peon gasfield in the Norwegian sector of the North Sea. The received response of the transient square-wave data was 11 dB greater than that of the pseudo-random binary sequence data, due to diffusive attenuation of higher frequencies present in the more broadband pseudo-random binary sequence signature. Deconvolution of the pseudo-random binary sequence data recovers the total impulse response function, increases the signal-to-noise ratio by 32.6 dB and separates most of the air wave from the earth impulse response by the causality principle. The recovered impulse responses have more detailed information in the frequency domain than the transient square-wave data. The pseudo-random binary sequence data were acquired with a 10 Hz source bit rate but contain no information about the Peon gasfield at frequencies above 2 Hz. The bit rate could have been reduced to 4 Hz, increasing the signal energy below 2 Hz by 150% and thus, potentially, increasing the signal-to-noise ratio by a further 4 dB.Because the total earth impulse response can be recovered from the broadbandwidth pseudo-random binary sequence data, further time-domain processing may be applied, including correlated noise removal, which can increase the signal-tonoise ratio by as much as 20 dB, and air wave removal using the causality principle. The information in the arrival time of the peak of the earth response provides the potential for traveltime to resistivity mapping to provide a starting model for inversion.

show abstract

Fast Calibration Method for Broadband Electromagnetic Prospecting Equipment

Yang

Guo

2020

2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

View full text Add to dashboard Cite

The Controlled Source Electro‐Magnetic (CSEM) Method in shallow water: a calibration survey

Cited by 7 publications

References 5 publications

Quantifying the effect of the air/water interface in marine active source EM

Quantifying the effect of the air/water interface in marine active source EM

Comparison of pseudo‐random binary sequence and square‐wave transient controlled‐source electromagnetic data over the Peon gas discovery, Norway

Fast Calibration Method for Broadband Electromagnetic Prospecting Equipment

Contact Info

Product

Resources

About