Is there such thing as 'Marine Vibrator'?

Oil and natural gas exploration -- geology and geophysics
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Seismic101
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Is there such thing as 'Marine Vibrator'?

Post by Seismic101 »

Hello there,

I have come to know that there are seismic vibrators that are used in marine exploration. True? If yes, is the attached picture a marine vibro? Please share a better picture if you have one.

Thanks in advance, peace and love!
Marine vibrator
Marine vibrator

A320ajm
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Re: Is there such thing as 'Marine Vibrator'?

Post by A320ajm »

I am not 100% sure, but rumour has it many companies have tried to create a "Marine Vibrator", especially in the 70s. The idea was to have a similar type of acquisition as used by Vibroseis trucks, but in a marine setting. Apparently no company managed to get a successful impulse response. I've also heard that the idea comes along now and again, some company will try and put R+D onto the idea, but it never manages to come off. But you never know, one day, with advancing seismic technology we may get one!

A320ajm

jeepster
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Re: Is there such thing as 'Marine Vibrator'?

Post by jeepster »

Yes there have been marine vibrators. Using a correlated sweep means you need less peak pressure than impulsive source, so it would be kinder to marine life. One proponent also claimed it could be used in shallower water than a gun array. Also the use of vibroseis allows for the simultaneous recording of two sources, that should make aquisition cheaper.
Originally used servo-hydraulics like land vibrators. Magnetostrictive transducers have also been tried.
They suffer from low efficiency at low frequencies, but since low frequencies are not absorbed so much, that was not considered a problem by developers.
Some companies are still working on them (Geokinetics and maybe PGS and ION).

GuyM
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Re: Is there such thing as 'Marine Vibrator'?

Post by GuyM »

Sure -

The US naval research office had a system called DTAGS which they were using 10+ years ago in hydrates research.
http://www7430.nrlssc.navy.mil/7432/hydrates/dtags.htm

There's also some work been done by Woodside on using magntofluid dynamics which looks interesting.

They are not in widespread use yet, however.

Seismic101
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Re: Is there such thing as 'Marine Vibrator'?

Post by Seismic101 »

Development: it seems like we do have a marine vibro now! Well- not a "vibro" in the traditional meaning of the word, but that's what they are calling it.

Sources: here http://www.gpusa-ca.com/products/ and here http://news.thomasnet.com/fullstory/mar ... n-20046643

What do you think of the name? Also, do you think it will help replace the environmentally controversial airgun?

GuyM
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Re: Is there such thing as 'Marine Vibrator'?

Post by GuyM »

A few companies are working on different approaches at the moment, I think.

Geokinetics have a marine vib in place : http://www.oedigital.com/energy/regulat ... erformance
BP and CGG are working on something as well : http://www.offshoreenergytoday.com/bp-c ... c-sources/

There was someone else working on developing lower frequency sources that had a wider distributed power output

I also met a (very clever) guy from Woodside who had an intriguing idea - check out this : http://www.google.com/patents/WO2014161041A1?cl=en

Back in '92 Texaco were playing around with using the ships screws and cavitation noise as a source, using a vibroseis-like approach.
I think they did it mainly for the title of the paper :D : https://www.onepetro.org/conference-paper/SEG-1992-0710
It worked pretty well ( you may be able to find the sections online if you look) - but cavitation destroys the propeller, so.....

I think we'll see non-impulsive sources appearing soon for mainstream use - if anyone has any money, that is.

rorybagleys
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Re: Is there such thing as 'Marine Vibrator'?

Post by rorybagleys »

Looks like there are many options out there for marine vibrators. Some better than others.

Pete
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Re: Is there such thing as 'Marine Vibrator'?

Post by Pete »

You actually have to separate between 'towed marine vibrators' and 'seabed vibrators'. to my knowledge all seabed vibrators either did not work, shaked themselves to death or were "lost".

All companies are experimenting with towed marine vibrators. Reliability, power and frequency are again the problems.

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