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New ideas in geophysical technology

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Wednesday, March 21, 2012

Video Presentation

The value of broadband seismic for imaging and reservoir geophysics

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Eivind Fromyr

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Talk Description
Seismic vessels have essentially operated in the same manner for the past sixty years. The principles of an acoustic source and hydrophone receivers have remained the same. Sensors have been placed on the seabed, in cables or nodes, but the majority of all marine seismic remains by towed streamer. Unfortunately the data quality is affected by the ghost - the result of an almost perfect reflection of the acoustic wavefield from the sea surface. Up-going waves are reflected back as down-going waves with a reversed polarity, and interfere constructively for certain frequencies and destructively for other frequencies. This phenomenon occurs both on the source side and on the receiver side and the affected frequencies depend solely on source and receiver tow depths. In 2007 PGS launched a dual-sensor streamer and broadband seismic became reality. The ability to separate the up-going and down-going wavefields is set to revolutionise the quality of marine seismic. In 2011 PGS took the next step and developed a ghost free source. Removal of both acquisition effects provides a broader bandwidth with improved noise characteristics ideal for accurate imaging and reservoir property analysis.

In this presentation we will review the enabling technologies, but mainly concentrate on the value of the resulting data for exploration and production. Improved imaging results from better penetration. Reservoir delineation and geobodies detection are improved due to increased signal to noise ratios and broader bandwidth. The broadening of the low frequencies represents a key improvement for lithology and fluid prediction and seismic reservoir property estimation. The need for a-priori information is considerably reduced by relying more on the data and less on a low frequency background model. As we will demonstrate, increased reliability on the data also delivers increased confidence in the resulting estimated properties and leads to reduced risk.

In concluding, we will also look ahead to future developments – use of the separated wavefields and also a towed streamer for electromagnetics.

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