Hi Geri !

Yep, the searches take place in the on behalf of OMV but is carried out
by a Polish company recently. Might be an issue of costs.....

I live on the northern edge of the flat "Marchfeld" area in Austria
which holds some oil/gas resources. Locator is JN88hl.

73
OE3GHB
Gerhard


Am Donnerstag, den 23.08.2012, 22:44 +0200 schrieb Holger 'Geri' DK8KW
DI2BO W1KW:
> Mal and all,
> 
> By profession I am probably one of the competent people to reply, I am a 
> Petroleum and Drilling Engineer working in the service sector of the oil and 
> gas industry.
> 
> Regarding the cables I can confirm what Gerhard mentions in his mail below, 
> these geophones pick up reflections from artificially created noise, mostly 
> from explosions or also from vibrating trucks on the surface.
> 
> There is, however, the use of VLF in drilling operations. There is a sort of 
> Measurement While Drilling technology, which uses low frequency currents to 
> transmit data from the drill bit some several thousand meters below the 
> surface to the surface. those systems are called EM-MWD, which means 
> electro-magnetic, however, is is more an AC modulated DC current that is used 
> to identify and demodulate the data. Frequencies here are in the hundreds of 
> Hertz range, and, hence, should not be any trouble to our VLF/LF/MF 
> activities.
> 
> Also, there are systems used for what we call borehole logging, which are 
> sensors that are used in boreholes to determine the formation properties, 
> that use frequencies of several hundred kHz, equal to LF or MF. Those are, 
> however, injected into the formation way below the surface and we might only 
> be able to detect those if a drilling rig is very close to our homes (not 
> completely unlikely because several geothermal drilling activities are 
> carried out directly in cities and populate areas these days). I know, 
> however, from tests we (my company) carried out back in the 80ties, that 
> those signals are attenuated some 200 db (!) on their way from the borehole 
> bottom to the surface.
> 
> Vy 73
> 
> Geri, DK8KW & DI2BO
> 
> P.S.: Gerhard, where do you live? I assume the seismic activities near your 
> home are carried out for OMV? It's one of my clients and I am in Vienna 
> around twice a month.
> 
> 
> On 23.08.2012, at 20:37, Gerhard Hickl <[email protected]> wrote:
> 
> > Hi Mal!
> > 
> > I live in an area (very Eastern part of Austria) which has GAS/OIL
> > resources. During the past two decades, it was common here to search for
> > new sources with the method you described.
> > 
> > As far as I know, those cables aren't carrying any kind of signal, but
> > rather they are used to transfer signals detected by probes
> > (microphones) to a central data-processing station.
> > 
> > The sources of this "noise" detected by the probes could be either
> > explosive loads, detonated in drilled holes up to some hundreds of
> > meters in depth, or vibrations generated by special machines. Those
> > machines are kind of Caterpillars with a big vibrating metal plate at
> > the bottom which is transferring mechanical vibrations into the ground.
> > 
> > From the radiation patterns, picked up by the many probes (microphones)
> > which are connected via a mesh of cables, geologists can tell about the
> > position of a undiscovered potential Oil/Gas - field.
> > 
> > So as far as I know and have experienced, there is no threat to our
> > activities.
> > 
> > 73
> > OE3GHB
> > Gerhard
> > 
> > 
> > 
> > 
> > Am Donnerstag, den 23.08.2012, 15:13 +0000 schrieb mal hamilton:
> >> LF/MF
> >> Seemingly some cables are being layed through out some parts of the UK
> >> for GAS es  OIL exploration. These cables will will carry a signal to
> >> penetrate the earth and detect if gas/oil is below. There will also be
> >> some small explosive charges at times in the earth and these will be
> >> detected also by the cable and fed to a master station.
> >> Does anyone know what frequency is transmitted down these cables or
> >> mode of transmission PULSE etc
> >> This could be a source of QRM for the LF/MF radio amateur and most
> >> people do not know it is taking place and wondering where the QRM is
> >> coming from.
> >> There will be a network of cables for hundreds of miles lying on
> >> fields and ditches etc while the exploration is going on
> >> 
> >> 
> >> de mal/g3kev
> >> 
> > 
> > 
> > 
>